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Yamaha raptor 660

I'll be riding then all of the sudden it will start to idle really high then blow out black smoke.

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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vortash
  • 431 Answers

SOURCE: Yamaha 660 raptor dies when choke is tuned off

hello I am Vortash .. I would say your problem is either blocked idler jets or incorrect fuel mixture ( Air to fuel not correct ) take the bike to your local garage to use their air line unless you have a compressor of your own remove the fuel feed tank side and blow it through with the airline if this don't cure it you will probably need to have the carbs tuned to manufacturesr spec's , If you are more mechanicaly minded strip the idler jets out pass a fine strip of wire through them and replace .You can also get this problem if you have an air leak on the maniflod or the carb bowl etc hope this helps regards Vortash

Posted on May 14, 2009

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  • 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

  • 921 Answers

SOURCE: my yamaha raptor 660 bogs out at high rpms while

Seafoam try it autozone sells it..$10

Posted on Sep 14, 2009

  • 921 Answers

SOURCE: yamaha raptor 660. Ignition fail when increase

possibly a pulse generator problem or spark unit, sounds like..check for loose connections.

Posted on Sep 15, 2009

  • 302 Answers

SOURCE: 02 YMF660 Yamaha Raptor won't rev

Check air filter, fuel filter and carb jets...
Check exhaust for obstructions and your plug wires.

Posted on Oct 13, 2009

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My Polaris sportsman 600 twin 2003 starts and idles but won't reve seems to be missing and blowing black smoke ?


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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

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

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2006 Yamaha rhino 660 is smoking white smoke


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Changing starter


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I have a 660 Grizzly 03 Atv im having a idle problem i have not did any repairs on this bike the idle will set its self down to low and quit running i set the idle up to normal and in a few moments of...


1. Check the INTAKE valve clearance!!!!
2. Check for an air leak
3. Install a new spark plug and air filter!!
4. Check the compression..
5. Have the carb professionally cleaned and set!!
>> Once you have sone all these steps.. repost to me if this did not fix it!!

Sep 07, 2017 | Yamaha 2004 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

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..

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