Faulty low oil pressure switch. 2003 Yamaha YFM660RR-RLER Raptor 660R LE. 2005 Yamaha YFM660RT-RSET Raptor 660R SE PDF Manual. thingy, remove stator cover, remove flywheel, take old chain out, put new chain in, buy gaskets put everything back together. Fuel mixture too rich or enrichener left on too long. Valve sticking in guide. Water or dirt in fuel system and carburetor. Imperfect seal at gaskets, push rod cover, washers, etc. 05 raptor 660 will not start. Raptor 660 big bore stroker 719 COMPLETE KIT!102mm cylinder11:1 CP-Carrillo forged stroker pistonHi temp piston ringsDLC chrome wristpinCirclipsHotrods +4mm stroker crank with rod assembledHD crank bearings - one installedWater pump bearingTransmission … Piston rings badly worn or broken. And, the timing chain made in china chain type = 4×5 length = 126 pins fits the following models. Restricted oil return line to tank. Spark plugs in bad condition or have improper gap or are partially fouled. Oil pump misaligned or in poor condition. the valve clearance was out a little too. Discharged battery, loose or corroded connections (solenoid chatters). Valve Train Noise 1. Hi everyone i have a 2001 yamaha raptor 660 It will start right up idle fine than at med.-high throttle it bogs,spits and sputters,and backfires. 4.4 out of 5 stars 28. Incorrect spark plug for the kind of service. Related Yamaha YFM660 Searches: ENGINE Starter Motor Does Not Operate or Does Not Turn Engine Over 1. Piston rings badly worn or broken. Water or dirt in fuel system and carburetor. Starter control circuit, relay, or solenoid faulty. Incorrect spark plug for the kind of service. Oil pan overfilled. new coil,timing chain, valves,carbs clean. Loose wire connection at coil, battery, ECM connector or ignition control module connector. Ball or clean-out plug missing or leaking in cam support plate. Valve Train Noise 1. Valve guides or seals worn. 2001 Yamaha YFM660RN-RNC Raptor 660R. Discharged battery, loose or broken battery terminal connections. Oil pan empty. Damaged carburetor. Bent push rod. Raptor 660 backfiring popping fix - YouTube. Spark plug cables in bad condition and shorting, cable connections loose or cables connected to incorrect cylinders. Starts But Runs Irregularly or Misses 1. Faulty spark plugs. O-ring damaged or missing from oil pump/crankcase junction (also results in poor engine performance). Oil pump not functioning. Upper engine mounting bracket loose. Spark plug cables in bad condition. Restricted breather operation. O-ring missing from cam support plate. Starts But Runs Irregularly or Misses 1. Ignition timing retarded due to faulty sensor(s): Manifold Absolute Pressure (MAP) and/or Crank Position (CKP). Engine lubricant too heavy (winter operation). Ignition not functioning properly (possible sensor failure). Heavy carbon deposit. Valve guides or seals badly worn. Oil pan underfilled. Battery nearly discharged. Primary chain badly worn or links tight as a result of insufficient lubrication or misalignment. Ignition timing advanced due to faulty sensor inputs (MAP and/or CKP). Engine run switch in OFF position. Oil Does Not Return To Oil Pan 1. Low Oil Pressure 1. Engine to transmission mounting bolts loose. Enrichener valve inoperative. Primary chain badly worn or links tight as a result of insufficient lubrication or misalignment. Engine lubricant too heavy (winter operation). Upper engine mounting bracket loose. Loose or dirty ECM connector or ignition control module connector. Ignition timing advanced due to faulty sensor inputs (MAP and/or CKP)/poorly tuned engine. Oil Does Not Return To Oil Pan 1. Electric starter shaft pinion gear not engaging or overrunning clutch slipping. Ignition timing advanced due to faulty sensor inputs (MAP and/or CKP). Spark plugs in bad condition or partially fouled. Starts Hard 1. Lower rocker housing gasket installed incorrectly (upside down). 2005 Yamaha 660 Raptor Stretched Timing Chain Comparison.wmv - YouTube. O-ring missing from cam support plate. Restricted oil return line to tank. Related Yamaha YFM660 Searches: ENGINE Starter Motor Does Not Operate or Does Not Turn Engine Over 1. Internal engine problem. $6.95 Yamaha YFM660R Raptor Manual $9.99 OEM Parts & Online Schematics Diagram.FREE. Amazon.com: raptor 660 parts. it is getting gas and fire and all it will do is turn over and backfire and still in time My 2001 raptor 660 starts when it's cold and runs great but if I shut it off when it gets hot it does'nt start back up until it cools down 2004 Yamaha YFM660RS-RLES Raptor 660 LE. If you don’t know the source of the trouble, go to the troubleshooting page for a list of causes and effects to determine the problem. Bent push rod. Restricted oil return line to pan. Insufficient oil supply or oil not circulating. Oil pan overfilled. Intake air leak. Restricted oil filter. Ignition switch not in ON position. Insufficient oil supply or oil not circulating. Piston rings badly worn or broken. Make sure this fits by entering your model number. Carburetor controls misadjusted. Fouled spark plugs. Faulty low oil pressure switch. Excessive Vibration 1. If you don’t know the source of the trouble, go to the troubleshooting page for a list of causes and effects to determine the problem. Starts Hard 1. Engine Uses Too Much Oil Or Smokes Excessively 1. Oil pan overfilled. Restricted breather operation. Bypass valve stuck in open position. Fault detected. Fouled spark plugs. Oil pump not functioning. There is a little mark on the timing chain gear connected to the crank, and there is a mark on the case beside it, if I line these two up does that mean it on TDC. Spark plug cables in bad condition and shorting, cable connections loose or cables connected to incorrect cylinders. Ignition timing advanced due to faulty sensor inputs (MAP and/or CKP)/poorly tuned engine. Tap to … Engine to transmission mounting bolts loose. Create your own unique website with customizable templates. Faulty ignition coil. Electric starter shaft pinion gear not engaging or overrunning clutch slipping. Engine run switch in OFF position. Loose or dirty ECM connector or ignition control module connector. Valve guides or seals badly worn. Rocker arm binding on shaft. Faulty Sensor(s): Manifold Absolute Pressure (MAP) and/or Crank Position (CKP). O-ring damaged or missing from oil pump/crankcase junction (also results in poor engine performance). Ignition timing incorrect due to faulty coil, ECM, ignition control module or sensors. Raptor 660 idles but no throtle response Idles ok, makes funny poping sound in exhaust, go to give it gas and nothing just sputters, took carbs off several times and cleaned them, didnt seperate them , but cleaned them thourgh.Getting to the point of frustration with this thing. Plugged crankcase scavenge port. Restricted oil filter. Overheating 1. Incorrect spark plug for the kind of service. Rocker arm binding on shaft. Restricted breather hose to air cleaner. Ignition timing retarded due to faulty sensor(s): Manifold Absolute Pressure (MAP) and/or Crank Position (CKP). This is a very detailed video on just getting the chain out of the 4 wheeler engine. It featured low to mid-range power, superb handling, and racy aesthetics. Performing the scheduled maintenance is very important. Pre-Ignition or Detonation (Knocks or Pings) 1. Faulty ignition coil, module, or sensor. Oil pump not functioning. High Oil Pressure 1. Pre-Ignition or Detonation (Knocks or Pings) 1. All chapters in the Raptor & Grizzly service manuals apply to the whole vehicle and this Yamaha 660 service repair manual illustrates procedures for removal & installation of components that are in detailed step-by-step fashion. The subsequent pages give detailed procedures. Bypass valve stuck in closed position. This service manual describes the service procedures for the Yamaha YFM660 Raptor & YFM-660 Grizzly. Fuel tank vent hose and vapor valve plugged, or carburetor fuel line closed off, restricting fuel flow. O-ring damaged or missing from oil pump/crankcase junction (also results in poor engine performance). Ignition not functioning properly (possible sensor failure). Oil pan underfilled. Performing the scheduled maintenance is very important. Now that I own it it, of course, it will not start. Spark plug gap too close or too wide. ... M MATI Left Handlebar Switch Control Engine Start Run Off Headlight for 5LP-83973-01-00 Yamaha ATV Big Bear 250 YFM/400 YFM Grizzly 350/400/660 YFM Raptor 350 YFM Kodiak 450 YFM Wolverine 350 YFM. Damaged intake or exhaust valve. 2002 Yamaha YFM660RP-RPB Raptor 660R LE. Pre-Ignition or Detonation (Knocks or Pings) 1. Wheels and/or tires worn or damaged. Discharged battery, loose or broken battery terminal connections. Oil pump misaligned or in poor condition. PSI? Fuel tank vent hose and vapor valve plugged, or carburetor fuel line closed off, restricting fuel flow. Loose wire connection at one of the battery terminals, coil, ECM connector or ignition control module connector. Spark plug cables in bad condition and shorting, cable connections loose or cables connected to incorrect cylinders. Fault detected. I have a 2004 yamaha raptor 660. A Spark Plug Fouls Repeatedly 1. Battery nearly discharged. Piston rings badly worn or broken. Ok I just put a new timing chain on my raptor 660. Faulty hydraulic lifters. Restricted breather operation. Internal engine problem. The Cyclepedia Yamaha YFM 660 Raptor Service Manual features detailed full-color photographs and wiring diagrams, complete specifications with step-by-step procedures performed and written by a veteran Yamaha dealer trained ATV technician. Restricted oil lines or fittings. This is short and simple video on how to set the timing on a typical 4 wheeler engine. This ATV should not be ridden by anyone under 16 years of age. Oil pump O-ring damaged or missing. Engine flooded with gasoline as a result of over use of enrichener. Excessive carbon deposit on piston head or in combustion chamber. Restricted oil filter. Performing the scheduled maintenance is very important. Spark plug cables in bad condition and leaking. Engine Leaks Oil From Cases, Push Rods, Hoses, Etc. Damaged carburetor. Questions/Comments/Concerns, please ask below! Air leak at intake manifold or air cleaner. Shopping. take off cam cover, remove cam, remove head, remove chain tensioner(sp?) Internal engine problem. I went to go in reverse and stalled twice, not being used to the rather tall gearing. O-ring damaged or missing from oil pump/crankcase junction (also results in poor engine performance). It has spark and you can give it fuel in the intake but no fire! Oil pump misaligned or in poor condition. This service manual describes the service procedures for the Yamaha YFM660 Raptor & YFM-660 Grizzly. Engine Turns Over But Does Not Start 1. Overheating 1. Applicable units for cdn and oceania from jy4am01y34c054974, for europe from *jy4am01w030019192* (51 pages), Manual will be automatically added to "My Manuals", Offroad Vehicle Yamaha Raptor YFM660RT Owner's Manual, Offroad Vehicle Yamaha RAPTOR YFM660RR Owner's Manual, Offroad Vehicle Yamaha YFM660RN Service Manual, Offroad Vehicle Yamaha RAPTOR YFM660R Owner's Manual, Offroad Vehicle Yamaha YFM660R Owner's Manual, Offroad Vehicle Yamaha YFM660RS Assembly Manual, Offroad Vehicle Yamaha YFM660FS Owner's Manual, Offroad Vehicle Yamaha YFM660FS Grizzly 4x4 Supplementary Service Manual, Offroad Vehicle Yamaha GRIZZLY Ultramatic YFM660FP Owner's Manual, Offroad Vehicle Yamaha YFM660FP Service Manual, Offroad Vehicle Yamaha GRIZZLY ULTRAMATIC YFM660FP Owner's Manual, Offroad Vehicle Yamaha YFM660FWA Supplementary Service Manual, Offroad Vehicle Yamaha YFM660FP 2002 Assembly Manual, Offroad Vehicle Yamaha Raptor YFM350RT Owner's Manual, Page 10: Location Of The Warning And Specification Labels, Page 20: Description And Machine Identification, Page 58: Reverse Knob Operation And Reverse Driving, Page 72: Ride With Care And Good Judgement, Page 110: Periodic Maintenance And Adjustment, Page 112: Periodic Maintenance/Lubrication, Page 115: Engine Oil And Oil Filter Cartridge, Page 133: Front And Rear Brake Pad Inspection, Page 140: Adjusting The Rear Brake Light Switch, Page 145: Cable Inspection And Lubrication, Page 146: Front Upper And Lower Arm Pivot Lubrication, Page 157: Tail/Brake Light Bulb Replacement, Page 174: Yamaha Extended Service (Y.e.s. Installed new piston and rings not sure if timing is correct due to it not starting how can I check the timing? Fuel mixture too rich or enrichener left on too long. Vacuum hose to automatic fuel supply valve disconnected, leaking, or pinched. Loose or dirty ECM connector or ignition control module connector. 2003 Yamaha YFM660RR-RLER Raptor 660R LE. Oil pan underfilled. All chapters in the Raptor & Grizzly service manuals apply to the whole vehicle and this Yamaha 660 service repair manual illustrates procedures for removal & installation of components that are in detailed step-by-step fashion. For an extra $700, you can add embellishments, storage, and tons of accessories. Ball or clean-out plug missing or leaking in cam support plate. Replaced it and now they are saying they can only get it running when they keep the throttle wide open. Incorrect push rod length. High Oil Pressure 1. Restricted breather hose to air cleaner. Manual covers all the topics like: Engine Service, General Information, Transmission, Chassis, Lighting, Steering, Seats System, Clutch, Suspension, Locks, Brakes, Lubrication, Electrical, Frame Fuel System, Battery, etc. The subsequent pages give detailed procedures. you will invest like $100 to do this Water or dirt in fuel system, carburetor or filter. Faulty ignition coil, module, or sensor. Restricted oil filter. Ball or clean-out plug missing or leaking in cam support plate. Leaking valve. Valve guides or seals badly worn. Discharged battery, loose or broken battery terminal connections. O-ring missing from cam support plate. All chapters in the Raptor & Grizzly service manuals apply to the whole vehicle and this Yamaha 660 service repair manual illustrates procedures for removal & installation of components that are in detailed step-by-step fashion. Incorrect push rod length. Copy link. Excessive Vibration 1. Find great deals on eBay for raptor 660 timing chain and raptor 660 timing chain oem. Carburetor controls not adjusted correctly. Faulty hydraulic lifters. Restricted oil return line to tank. Bank Angle Sensor tripped and ignition switch not cycled OFF then ON. Engine/transmission/rear wheel not aligned properly. Low oil pressure caused by oil feed pump not functioning properly or oil passages obstructed. Overheating 1. 2005 raptor 660 loose timing/cam chain. Bank Angle Sensor tripped and ignition switch not cycled OFF then ON. CT Raptor 660R 686cc Off Road/Trail Motor Package……$1395.00 Kit includes: CT head porting, 5 angle radius Race valve job, Web cam, cylinder bore for fitment of a JE hi performance 11/1 or 12/1 piston kit, valve spring kit with titanium retainers, valve stem seals, head cleaning, assembly and disassembly of valves from head, valve grinding, and top-end gasket set. Bypass valve stuck in open position. Skip to main content.us. Weak or broken valve springs. Faulty hydraulic lifters. Primary chain badly worn or links tight as a result of insufficient lubrication or misalignment. Water or dirt in fuel system, carburetor or filter. Fouled spark plugs. Ignition timing incorrect due to faulty coil, ECM, ignition control module or sensors. Wheels and/or tires worn or damaged. The average retail price of the Raptor is currently between $2,030 and $2,535. Spark plugs in bad condition or partially fouled. Follow the Maintenance Schedule recommendations to ensure that the ATV is in peak operating condition and the emission levels are within the standards set by the your states/county Resources Board. 2004 Yamaha YFM660RS-RLES Raptor 660 … Info. Engine lubricant too heavy (winter operation). Heavy carbon deposit. Carburetor controls misadjusted. Incorrect spark plug for the kind of service. What kind of spark plug does a Raptor 660 take? 05 raptor 660 will not start. Piston rings badly worn or broken. Oil pump O-ring damaged or missing. 2006 raptor 660 was backfiring and popping. O-ring damaged or missing from oil pump/crankcase junction (also results in poor engine performance). Ignition switch not in ON position. Low oil pressure caused by oil feed pump not functioning properly or oil passages obstructed. Vacuum hose to automatic fuel supply valve disconnected, leaking, or pinched. Plugged crankcase scavenge port. Engine flooded with gasoline as a result of over use of enrichener. Spark plug cables in bad condition. Engine Turns Over But Does Not Start 1. Valve sticking in guide. Restricted oil return line to pan. Incorrect valve timing. Restricted oil filter. Incorrect valve timing. Engine Turns Over But Does Not Start 1. Ignition timing advanced due to faulty sensor inputs (MAP and/or CKP)/poorly tuned engine. ). Valves sticking. Weak or broken valve springs. Excessive carbon deposit on piston head or in combustion chamber. A Spark Plug Fouls Repeatedly 1. Heavy carbon deposit. Starts Hard 1. It compensates for the initial wear that occurs during the life of the Yamaha 660. Engine to transmission mounting bolts loose. Chain tensioning spring or shoe worn. Imperfect seal at gaskets, push rod cover, washers, etc. Intermittent short circuit due to damaged wire insulation. Valves sticking. Faulty ignition coil. Damaged intake or exhaust valve. Service Manual, Repair Manual, Owner's Manual, Raptor Manual, Grizzly Manual, 2001, 2002, 2003, 2004, 2005, 2006, 01, 02, 03, 04, 05, 06,2007 2008 07 08 YFM660R, ATV Shop Manual, Workshop Manual, Yamaha YFM Service Manuals pdf, Factory Repair Guide User's Guide, Guide Book, Handbook, Book, Instructions Manual, Download Manual. Oil pump misaligned or in poor condition. Faulty Sensor(s): Manifold Absolute Pressure (MAP) and/or Crank Position (CKP). Oil pump misaligned or in poor condition. Check Engine Light Illuminates During Operation 1. Ignition timing incorrect due to faulty coil, ECM, ignition control module or sensors. The subsequent pages give detailed procedures. Low Oil Pressure 1. prior to this problem it wouldnt ride very good in reverse (popped and sputterred) Hi, I am the new (but not proud) owner of an '02 Raptor 660 that was said to have a 720 big bore hot cam and K&N filter. Spark plugs in bad condition or have improper gap or are partially fouled. Fuel octane rating too low. Oil pump misaligned or in poor condition. Oil Does Not Return To Oil Pan 1. it is getting gas and fire and all it will do is turn over and backfire and still in time My 2001 raptor 660 starts when it's cold and runs great but if I shut it off when it gets hot it does'nt start back up until it cools down Carburetor controls not adjusted correctly. Instant Download. Excessive Vibration 1. Oil pan overfilled. Engine Leaks Oil From Cases, Push Rods, Hoses, Etc. Starter control circuit, relay, or solenoid faulty. O-ring damaged or missing from oil pump/crankcase junction (also results in poor engine performance). as soon as you let it go it shuts off. Incorrect spark plug for the kind of service. Rocker arm binding on shaft. Related Yamaha YFM660 Searches: ENGINE Starter Motor Does Not Operate or Does Not Turn Engine Over 1. The Yamaha Raptor 350 was a sport and recreational ATV produced by Yamaha from 2004 to 2013. Air leak at intake manifold or air cleaner. Fuel octane rating too low. Restricted oil filter. Enrichener valve inoperative. Fault detected. Vacuum hose to automatic fuel supply valve disconnected, leaking, or pinched. Manual covers all the topics like: Engine Service, General Information, Transmission, Chassis, Lighting, Steering, Seats System, Clutch, Suspension, Locks, Brakes, Lubrication, Electrical, Frame Fuel System, Battery, etc. 2005 Yamaha 660 Raptor Stretched Timing Chain Comparison.wmv. Follow the Maintenance Schedule recommendations to ensure that the ATV is in peak operating condition and the emission levels are within the standards set by the your states/county Resources Board. Shop with confidence. The 2001 Yamaha Raptor 660 list price was $6,499, $300 less than its 2005 model. Loose wire connection at coil, battery, ECM connector or ignition control module connector. Most YFM-660 Raptor & Grizzly service manual chapters start with an assembly or system illustration, diagrams, exploded parts view, quality pictures, service information and troubleshooting for the section. Discharged battery, loose or corroded connections (solenoid chatters). Damaged intake or exhaust valve. This four-wheeler was fun to ride and perfect for off … Fuel tank vent system plugged or carburetor vent line closed off. Restricted oil lines or fittings. Service Manual, Repair Manual, Owner's Manual, Raptor Manual, Grizzly Manual, 2001, 2002, 2003, 2004, 2005, 2006, 01, 02, 03, 04, 05, 06,2007 2008 07 08 YFM660R, ATV Shop Manual, Workshop Manual, Yamaha YFM Service Manuals pdf, Factory Repair Guide User's Guide, Guide Book, Handbook, Book, Instructions Manual, Download Manual. Discharged battery, loose or corroded connections (solenoid chatters). Spark plug cables in bad condition and leaking. Valve Train Noise 1. Engine run switch in OFF position. Bent push rod. Oil pan overfilled. Oil pan overfilled. 2002 yamaha raptor 660r turns over and smoke comes from exhaust but when I put my hand over the intakes the one on the right spits gas … Broken frame. Incorrect valve timing. Most YFM-660 Raptor & Grizzly service manual chapters start with an assembly or system illustration, diagrams, exploded parts view, quality pictures, service information and troubleshooting for the section. RAPTOR YFM660RP offroad vehicle pdf manual download. Most YFM-660 Raptor & Grizzly service manual chapters start with an assembly or system illustration, diagrams, exploded parts view, quality pictures, service information and troubleshooting for the section. Share. Ignition switch not in ON position. Fuel tank empty or fuel supply valve turned off. Check Engine Light Illuminates During Operation 1. Starter control circuit, relay, or solenoid faulty. Engine/transmission/rear wheel not aligned properly. A Spark Plug Fouls Repeatedly 1. Valve guides or seals worn. Follow the Maintenance Schedule recommendations to ensure that the ATV is in peak operating condition and the emission levels are within the standards set by the your states/county Resources Board. Wheels and/or tires worn or damaged. Excessive carbon deposit on piston head or in combustion chamber. Battery nearly discharged. Watch later. Fuel mixture too rich or enrichener left on too long. Engine Uses Too Much Oil Or Smokes Excessively 1. Bank Angle Sensor tripped and ignition switch not cycled OFF then ON. Loose wire connection at one of the battery terminals, coil, ECM connector or ignition control module connector. Check Engine Light Illuminates During Operation 1. Oil pan empty. Fuel tank empty or fuel supply valve turned off. Low Oil Pressure 1. new coil,timing chain, valves,carbs clean. Battery nearly discharged. Engine lubricant too heavy (winter operation). new coil,timing chain, valves,carbs clean. Upper engine mounting bracket loose. Oil pan overfilled. Fuel tank vent system plugged or carburetor vent line closed off. Valve sticking in guide. 2002 Yamaha YFM660RP-RPB Raptor 660R LE. Incorrect push rod length. Ignition timing advanced due to faulty sensor inputs (MAP and/or CKP). Faulty spark plugs. Restricted oil filter. Damaged wire or loose connection at battery terminals, coil, ECM connector or ignition control module connector. Service Manual, Repair Manual, Owner's Manual, Raptor Manual, Grizzly Manual, 2001, 2002, 2003, 2004, 2005, 2006, 01, 02, 03, 04, 05, 06,2007 2008 07 08 YFM660R, ATV Shop Manual, Workshop Manual, Yamaha YFM Service Manuals pdf, Factory Repair Guide User's Guide, Guide Book, Handbook, Book, Instructions Manual, Download Manual. Engine/transmission/rear wheel not aligned properly. Insufficient air flow over engine. It contains important safety information. Intermittent short circuit due to damaged wire insulation. If you don’t know the source of the trouble, go to the troubleshooting page for a list of causes and effects to determine the problem. Loose wire connection at coil, battery, ECM connector or ignition control module connector. Electric starter shaft pinion gear not engaging or overrunning clutch slipping. Fuel octane rating too low. High Oil Pressure 1. Shop with confidence. Chain tensioning spring or shoe worn. Complete service repair workshop manual for the: Yamaha YFM660 Raptor 660R YFM660R This is the same manual dealerships use to repair your atv. Broken frame. Oil pan empty. Engine lubricant too heavy (winter operation). This service manual describes the service procedures for the Yamaha YFM660 Raptor & YFM-660 Grizzly. Oil pump O-ring damaged or missing. What should I read for comp. Lower rocker housing gasket installed incorrectly (upside down). Spark plug gap too close or too wide. It wasn’t a crowd-pleaser, but for Raptor owners, it was one spectacular machine. Find great deals on eBay for raptor 660 timing chain tensioner. It compensates for the initial wear that occurs during the life of the Yamaha 660. Leaking valve. Ignition timing retarded due to faulty sensor(s): Manifold Absolute Pressure (MAP) and/or Crank Position (CKP). It shut off when riding and then I took i to the shop and they said it was the cdi box. Taski 1200 Ergrodisc Machine Parts Manuals, Fundamentals Of Information Systems Security Lab Manual. 2001 Yamaha YFM660RN-RNC Raptor 660R. Damaged wire or loose connection at battery terminals, coil, ECM connector or ignition control module connector. Faulty low oil pressure switch. Restricted oil filter. Bypass valve stuck in open position. Intake air leak. The Carbex Yamaha Raptor 660 Timing Chain ‘s superior materials makes sure that it ages well with use. Broken frame. Faulty spark plugs. Piston rings badly worn or broken. It compensates for the initial wear that occurs during the life of the Yamaha 660. Insufficient air flow over engine. Chain tensioning spring or shoe worn. Incorrect spark plug for the kind of service. Fuel tank empty or fuel supply valve turned off. Faulty Sensor(s): Manifold Absolute Pressure (MAP) and/or Crank Position (CKP). Insufficient oil supply or oil not circulating. Oil pan overfilled. it is getting gas and fire and all it will - Yamaha 2003 YZ 125 question View and Download Yamaha RAPTOR YFM660RP owner's manual online. Restricted oil return line to pan. Restricted oil lines or fittings. Valve guides or seals worn. Engine flooded with gasoline as a result of over use of enrichener. What is the worth of a Yamaha Raptor 660? Insufficient air flow over engine. 05 raptor 660 will not start. Weak or broken valve springs. Leaking valve. Low oil pressure caused by oil feed pump not functioning properly or oil passages obstructed. Engine Uses Too Much Oil Or Smokes Excessively 1.