Question about Yamaha XT 660 R Motorcycles

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Throttle sticks at full

2000 yamaha 660 grizzly. Suddenly the throttle sticks at full. Problem is in carb.

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Sounds like the return spring got squashed. Take the top off of the carb, free up the spring and, if it isn't broken, reassemble carefully.
Try it afterwards, if it still sticks it could be the cable.

Posted on Sep 10, 2009

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Yeah, no 660 till 2002, 600 though . If it is 660 they aren't traditional Carb that cap screws off with spring and piston controlled by cable. Its a butterfly controlled by cable creating vaccuum that lifts piston by diaphragm. Check all mechanical functioning of Carb parts.

Posted on Apr 22, 2011

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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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In the past the intake manifolds on the grizzly engines tend to tear or separate at about the age of your machine. Take your carburetor back off and inspect the intake manifold for damage.

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2008 Yamaha 660 Grizzly???? Help?


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