Question about RTO Quads 125cc Full Size Adult 4 Wheelers ATV

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Yamaha 660 raptor runs then sputters after about

Yamaha 660 raptor runs then sputters after about 60 ft. I have changed gas,plug took carbs off cleaned with cleaner and also took out all jets and ran a wire tru them to make sure there wasnt any thing blocking them put back on and same problem exist? also if i pump gas it will continue to run but same problem exist

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Clean the filters on the petcock?

Posted on Mar 12, 2014

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 11 Answers

SOURCE: grizzly 660 will not start

Did you check the resistance on the stator? the stators are known to go out on the rhinos!

Posted on Dec 20, 2009

  • 10 Answers

SOURCE: yamaha 80cc bager with weak spark wont run

Samantha,
Electrical problems can be either, coil, (most common) stator, magneto, or timing. Make sure the coil is grounded to the frame of the quad and not against a painted part. It should be in contact with raw metal. The stator or magneto could be tested at a dealer. Good luck.

Posted on Apr 06, 2010

  • 22 Answers

SOURCE: New ATV. Ran 1 hour. Sitting for 6 months.

sounds like the gas that was left in the carb. has turned bad and clogged the jets. the only right way to fix it is to pull the carb off the bike and take the bottom bowl off. once done you can take some carb. cleaner and spray out all the jets and crevices inside the carb. hopefully this fixes your problem. if not then you will need to pull the carb. completely apart and give it a good soaking. once you have soaked it for an hour or so take some compressed air and blow out any holes. be sure to blow it out good. once done put the carb. back together and give it a shot. this should fix it right up for ya.

Posted on Aug 07, 2010

  • 1 Answer

SOURCE: Bombardier quest 500 (2003)- starts

that would be ur floats they can get stuck go into the carborator and clean it out real good the floats are in the center of the carborator

Posted on Sep 30, 2010

  • 239 Answers

SOURCE: 2004 Quest 500--Starts fine. Will

The problem would appear to either be with the mixture or with the head. Too rich a mixture (too much fuel) will cause black plugs - when you take them out do the engine and plugs smell of petrol? You need to adjust the carburettor. Mark where the throttle screw is to start with and then slowly screw it (in - I think) to reduce the petrol flow.
The other alternative is that their is a problem in the head. Does the engine blow a lot of blue/black smoke out when it is hot. If yes it means a full engine strip down!

Posted on Mar 03, 2011

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Raptor 350 wont idle without choke on


you have debris in your main and/or idle jets or/and a plugged emulsion tube

Aug 29, 2014 | Yamaha 2005 Raptor 350

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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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Why does my atv start but wont stay running/


GAS ON ? choke on ? clean gas and filter? is it getting gas ? carb out adj? valves out adj? spark plug fouled ?

Jul 21, 2014 | ATVs

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Yamaha raptor 660


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

Apr 29, 2014 | ATVs

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Changing starter


You can find a lot of informations about how you can change the starter, on the repair manual for your ATV.
You can download it very easy form: Yamaha Repair Manuals

Feb 23, 2014 | RTO 200cc Full Size Four Wheeler ATV

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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.


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..

Jun 23, 2017 | Yamaha 2010 Raptor 90

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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