Question about 2006 Yamaha XT 660 X

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2005 Grizzly 660 backfired had shop put to key in flywheel becase it was sheared, now starter doesnt engage and cannot pull over by hand ? Can timing be off

Starter sounds like its turning over but does not engage I guess to start the wheeler, has 600 miles on it

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Sounds like the shop messed up. one way clutch in backwards or gear in wrong. If timing off would hit valve and lock up

Posted on Nov 17, 2013

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Posted on Jan 02, 2017

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SOURCE: 2000 yamaha breeze 125 starter not engaging

The intermediate cog will spin freely one way but not the other, works on a principle similar to a centrafugal clutch.

Posted on Dec 30, 2008

  • 1 Answer

SOURCE: No starter engagement 2005 Silverado 1100

I would seriouly look at the starter clutch, the 1100 yamaha cruiser motors are notorious for this problem way back when the same motor was in the viragos and the xvs 1100 vstars, yamaha have tried to fix the prob over the years but stillhavn't got it right. if it just spins and whirs without engaging the engine, but sometime will kick in engagement, it sounds like your starter clutch is on it's way out. they cost from yamaha around $450- 500 ea plus around $350 to fit you have to include a $30 gasket in all that.

Posted on Mar 06, 2009

  • 142 Answers

SOURCE: Yamaha 2001 Raptor 660, need to clean my carb

Drain and replace the gas with fresh.
Remove the air cleaner and spray carb cleaner into the inlet. Work your throttle a little then put everything back together and try to start it.

Posted on Jun 02, 2009

  • 743 Answers

SOURCE: I have a 2007 Yamaha Grizzly 660. It was running

It sounds like you got some corrosion going on, on the ground side. I would start with the battery cables first and see if they need cleaned up, then go to the connectors and unplug them and clean if necessary and put die-electrical grease in the sockets of the connectors before plugging them back in. I am assuming that the shifter is electrically assisted if there are problems going on with it as well...this is what makes me believe that it is a bad ground due to setting maybe in a damp inviroment.

Posted on Oct 19, 2009

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SOURCE: 2005 grizzly 660 rear drive shafts pop out of the gear box a lot

There should be a circlips at the end of the driveshaft.
That circlips holds the shaft IN the differential parts.

If you have still warranty, let it repair by a dealer. The circlips is maybe INSIDE the differential casing and can thus destroy a lot of parts!

Posted on Nov 01, 2009

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Toro timecutter rough idle, backfires, loses power when blades engaged. Spark plug is gapped correctly, have even changed spark plug with no change.


might check the valves to see if they are set correctly and push rods not bent. turn engine over by hand to be sure valves are opening and closing . or check the flywheel key. if it has sheared it will cause it to back fire as the timing will be off.

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


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I have a9hp briggs verticals shaft engine on a log splitter. When I try to start the engine after a couple of pulls it will backfire and pull the pull cord right out of my hand. I've been told that I have...


Far more likely is that the woodriff key , on the flywheel, is slightly stripped or sheared, due to sudden stoppage of engine. Remove shroud and flywheel (may need puller or help to do so) Check flywheel key(woodriff) to see if it is ok or partly sheared.

As far a valves, I doubt that they are adjustable. Look up gap for that engine and check, at maximum opening (Turn by hand )with feeler gauge (metal thickness gauge) open adjustment on valve. You will see how when checking the gap. Personally I still don't believe that they are adjustable.

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Sounds typical of a broken key on the flywheel which allows the timing to fire at the wrong time. Flywheel on a mower is under the pull start mechanism housing. Caused by hitting something solid with the blade and the momentum of the engine shaft cracks or shears the metal key part. Remove the flywheel carefully and put in a new key.

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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.


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Check your flywheel key, it may have slightly started to shear. Which will throw the spark timing a little off.

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Two possibilities here, either the blade bolt is loose ( the blade is used as a flywheel so needs to be tight ) or the flywheel key has sheared knocking the ignition timing out.

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When i start it , it kicks and hurts my hand


The flywheel key is at least partially sheared. This affects the ignition timing, causing it to fire at the wrong time and the engine kicks back at you while trying to start it with the recoil starter.

The flywheel key is located under the flywheel. The flywheel is the round metal piece with all the fins on it. The flywheel is located under the recoil starter (part that has the pull string). Make sure that you use a soft metal key.

In the event that you do not know how this happened, it usually occurs from hitting something hard with the blades.

I hope this helps you out.

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Backfires through the air cleaner


This usually means a bent or sheared key in the flywheel. Remove the shroud exposing the flywheel buy a 6" flywheel puller and remove the nut for the flywheel and attach the three jaw puller remove the flywheel and replace the flywheel key. The only other thing that causes this popping through the carb is a burnt intake valve this is a job for a lawn mower shop.

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