Question about Yamaha 2006 Grizzly 660 Auto 4x4

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2003 Yamaha 660 grizzly will not idle, will idle with choke on. Had carb apart.

Had carb apart to replace needle and seat, had a complete carb kit, but I have different jets and K&N filter. Took all the jets to clean everything out. Installed carb and the concern started. If you leave the choke on a little it runs, if you turn coke all the way off it stalls instantly.

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Posted on Jan 02, 2017

SOURCE: My 2005 Grizzly 660 stalls imediately upon giving

Does it run better on full choke, but only goes slow? I bet I know what it is. On the top of the Carb take off the cover, there is a rubber diaphragm in there, I bet it has a hole in it. When you push the throttle , that creates a vacuum, which lifts that piston to give it gas, otherwise it just gets air, starving for gas, it just kills.You should use an impact screwdriver (ya hit with hammer) to loosen them screws! That soft *** metal strips like its lead!

Posted on Apr 21, 2011

  • 1632 Answers

SOURCE: my 550 grizzly won't idle.seems to run out of

Clean Maf and check contact at TPS but all that should under waranty , take it to the dealer .

Posted on Nov 03, 2013

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Why would my 660 grizzly pop in & out of forward gear, jus whines, jumpin in & Out ???


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Aug 17, 2015 | Yamaha 2005 Grizzly 660 Auto 4x4

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Why does my yamaha 660 only run if the choke is on? What causes it to backfire?


Most of the time it's because the Pilot/Idle jet is clogged in the carburetor. This most often happens because of old fuel sitting in the carburetor during long periods of sitting and non-use. The fuel forms a varnish - a gummy layer inside of your carburetor and clogs the tiny holes in the idle jet. Since fuel can't get through, the engine dies. The hole for the choke is larger, therefore the fuel can still get through it.

clogged carb jets Google Search

Jul 20, 2014 | Yamaha 2005 Grizzly 660 Auto 4x4

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

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

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1 Answer

My 05 Yamaha Grizzly 660 will not start. In my limited troublshooting practice I looked at FUEL, FIRE and AIR. Here is the fault, the engine will not start. I checked wires/fuses, plugs, fuel lines and air...


Sounds like you have a stuck float needle in the carbs (2). Usually after a few days with gas in the carb they will free up, you could 'knock' on the carbs with the plastic end of a screwdriver to help free them up. If not, turn off fuel, drain the carbs and fill them with carb cleaner for 24 hours. Redrain, attach fuel lines and turn the gas back on. If still no start it's time for a rebuild...

Mar 05, 2017 | Yamaha 2005 Grizzly 660 Auto 4x4

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