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My 2004 yamaha raptor 660 keeps bogging down when i give it gas

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My son bought a Yamaha 660R Raptor and the wiring is a complete mess through out the entire chassis. I am looking for a wiring diagram to straighten it out.


hey Tom.
get this manual.. OR get a FACTORY service manual from your local dealer.... this will be invaluable later...

Yamaha Raptor 660R ATV Repair Manual 2001 2005

please mark as helpful, thanks...

Jul 29, 2017 | Yamaha 2004 Raptor 660R

1 Answer

Yamaha raptor 660


clutch burned up...sounds like it. pull the clutch cover off and inspect it.

Apr 29, 2014 | ATVs

1 Answer

Changing starter


You can find a lot of informations about how you can change the starter, on the repair manual for your ATV.
You can download it very easy form: Yamaha Repair Manuals

Feb 23, 2014 | RTO 200cc Full Size Four Wheeler ATV

1 Answer

Backfires when you try to rev up engine,


check fuel flow and check spark at spark plugs

According to an "ATV Rider" 2009 article, "When the Grizzly was introduced in 1998 as a 600cc machine, the top was blown right off the displacement wars of the time."
It was replaced in 2002 with Yamaha Grizzly 660, an even bigger engine derived from the well-established all-terrain vehicle (ATV) Yamaha Raptor 660R.
Grizzly's 660 cubic centimeter (cc), four-stroke, liquid-cooled single overhead camshaft, five-valve engine performs well in open country, but sometimes it causes serious problems for owners.
Before you call a Grizzly dealer, however, trying a few tricks in your garage can save you a lot of time and money.

Check the fuel level.
Locate the fuel meter indicator on top of the multifunction display.
If it does not work properly, open the fuel tank, and push the Yamaha 660 Grizzly side to side.
Ensure the fuel is not contaminated by water or rust.
If you have not driven your Grizzly 660 for a long time, drain the tank completely, and fill it with a fuel tank cleaner.

Check fuel hoses for cracks or leakage.
The hoses should be soft and simple to bend.
Replace those that show any sign of wear.

Check the compression.
Screw a compression tester into the spark plug hole, and press the electric starter button.
If no compression exists, contact a Yamaha dealer.
Wipe wet or dirty electrodes with a dry cloth.
The spark plug gap should be checked regularly

Correct the spark plug gap.
Measure the gap with a wire thickness gauge.
If necessary, adjust it to 0.8mm using a screwdriver or replace the spark plug.
Use only a Yamaha-specified spark plug.

Check the Yamaha 660 Grizzly's battery.
Operate its electric starter.
If the Grizzly starts quickly, then its battery is in good condition.
If the engine turns slowly, check the battery lead connections, and you may need to change the battery.
If the engine still does not eventually start, your Grizzly is beyond home repair.


Jul 23, 2013 | Yamaha 2005 Grizzly 660 Auto 4x4

1 Answer

Raptor 660 starting problem...new plug, new hoses, new oil, new radiator, rebuilt water pump, rebuilt thermostat, cleaned carb, cleaned all jets, cleaned petcock, cleaned fuel filter, turns over fine,...


Hey Josh,
Cleaning a carb is a little more that most people realize..it takes someone with knowledge and training to really do one right... take it to a professional..

Jun 23, 2017 | Yamaha 2010 Raptor 90

1 Answer

2003 yamaha grizzly 660 4x4 atv, right side rear axle/cv joint came lose at differential


Yamaha Grizzly 660 2002 2008

get one of these..If you are going to try the repair yourself....
.this is serious, ....
there MIGHT be damaged components that need to be inspected by a professional.

Mar 17, 2011 | Yamaha 2004 Grizzly 660 Auto 4x4

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