Question about 2000 Yamaha TT 600 R

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2008 Yamaha 660 Grizzly???? Help?

When in neutral just sitting there, the fourwheeler sounds like its going as if you were in foward. But if you put it in forward it jumps and it will accelerate without you pressing the throttle? carberator? idk? NOTICE: it is a 2008 Yamaha grizzly 660, not what the problem lists because my fourwheeler was not listed in there

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  • tombones May 11, 2010

    Sounds like extra air is creating a lean air / fuel mix. Try tightening the intake manifold and all clamps from carb to cylinder.

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Try turning your idle down, i have a 98 grizzly 600 and the other day it was cold so i turned the idle up to start it and wen i put it into gear i would drive itself if ur idle screw is in the same place as mine it should be above the engine beside ur left leg turn it left to turn it down wen ur idle is up ur motor is reved to hi wen going into gear hope my advice helps

Posted on Jul 17, 2009

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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.


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