Question about 2004 Yamaha XT 660 R

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My 04 raptor 660 will not start i checked the spark plug to see if it was firing and it is and its getting fuel also what should i do next.it wil only spin over

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The three required ingredients for combustion are: fuel, compression, and a spark (at the right time). So, if it's got fuel and spark, I would check the compression. With the throttle held wide open, you should see at least 140 psi of compression. Anything less than that - and it isn't going anywhere (under its own power).
If the compression is low, check and adjust the valve tappet clearance. Insufficient tappet clearance is the most common cause of low compression in 4-cycle engines.
If the compression is okay, and it still won't run, then check for plugged carburetor jets. Especially if the bike has ever sat for more than a few months. Gasoline, when it evaporates, leaves a gooey mess behind.

Posted on Dec 12, 2009

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2 Answers

My Yamaha Raptor 660 is back firing and not reving up


could be a few things your fuel filter could be clogged along with your air filters your crabs may be gummed up did you make any adjustments to your carbs 3 turns on lh carb 2 turns out on rh carb i like using sea foam it seems to keep my fuel system clean try that stuff i also gap my spark plug at .033

Jun 10, 2014 | 2004 Yamaha XT 660 R

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

Need additional assistance...03 raptor 660, new plug, new oil, new fuel, clean fuel filter, clean petcock, cleaned carbs 5 times, used wire to clear jets(from one solution earlier), readjusted air screws...


how is the fuel flow? i just went rounds with a mower and it turned out the tank vent was faulty stopping the amount of fuel flow to the carb. it would flow fine for a minute until it needed air in the tank and then would stop.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/kelly_69a0cf1b13789df1

Feb 11, 2013 | Garden

1 Answer

05 raptor 660 will not start. new coil,timing chain, valves,carbs clean. it is getting gas and fire and all it will do is turn over and backfire and still in time


My 2001 raptor 660 starts when it's cold and runs great but if I shut it off when it gets hot it does'nt start back up until it cools down

May 28, 2012 | 2003 Yamaha YZ 125

1 Answer

My 2003 660 raptor will not start


You have probably checked spark by now. if you haven't do so. also check your ignition box.

May 17, 2010 | 2003 Yamaha YZ 125

1 Answer

I HAVE AN 01 660 RAPTOR GOT SPARK BUT WONT START


Try intoducing a small amount of fuel (half a teaspoon) of fuel through plug hole, refit plug & try, if it fires it will show fuel problem up. Also, is the plug wet when you remove it after trying to start? If it's very wet, may just be badly flooded. If not wet, check for fuel filter & if it's blocked, check air filter etc, hope this helps.

Dec 26, 2009 | 2004 Yamaha XT 660 R

2 Answers

02 YMF660 Yamaha Raptor won't rev


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

Oct 13, 2009 | Yamaha XT 660 R Motorcycles

1 Answer

660 04 raptor hit puddle stalled me out wouldnt start


I would try unpluging all electrical connections and putting dielectric grease in them.

Jul 27, 2009 | 2004 Yamaha XT 660 R

1 Answer

Back fireing 660 raptor


when its hot and humid you could be having a ignition coil or cable problem.check cables and replace plugs, then take it from there. have your ignition coil tested also. backfiring is a sure sign of an ignition problem

Jun 14, 2009 | 2004 Yamaha XT 660 R

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