Question about 2001 Yamaha XTZ 660

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My 660 raptor quad is making like a humming/deep whistling sound when I try to start and won't start. It has good spark and new fuel. I noticed that the oil tank has built up pressure as I opened it the oil poured out. I'm about to pull the carb, since it has been sitting for a while

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Sounds like the carb has over flowed and filled the crankcase with gas.
You will need to drain the oil, and re-fill it with new oil at the proper amount. Also replace the oil filter.
Clean the air filter and replace the spark plug.
Clean the carb, making sure the float and float needle are functioning properly.
That should fix you up!
RSRBOB

Posted on Oct 05, 2009

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Posted on Jan 02, 2017

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1 Answer

XT 660 R backfired when it was revving now won't start


Hi, Anonymous and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage check for spark leakage in the dark.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
http://www.raptorforum.com/forums/66-raptor-660-maintenance/5079-raptor-won-t-start-sounds-off-time-backfiring-out-carb.html
Backfire or Backpoping on stock strato
Yamaha XT660R Service Manual
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Yamaha XT660R Owner Manual

Mar 03, 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.

Feb 11, 2013 | Garden

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

2 Answers

2001 raptor 660 won't idle, only runs with choke on, an won't take throttle???


need your carb rebuilt or your carb readjusted. sounds like you might have some mud in it. do you take it in the mud? if so check the top where the throttle cable comes through.

Sep 22, 2012 | K and N Filters Powerlid 2001-2005 Yamaha...

1 Answer

I was out on my 01 Raptor 660R and it just died on me when I try to start and cranks over faster then usual and won't fire up I took the spark plug out it was dry so obviously no fuel so I try to pull...


Hi, have you checked the compression, usually when they turn faster than normal (motor that is) than it is not a good sign, if compression is ok, maybe your valves are sticking which would cause it to turn faster, try changing to a good quality oil!!!

Feb 14, 2011 | 2004 Yamaha XT 660 R

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

6 Answers

02 raptor 660 just all of a sudden wont start just clicking sound


Try jumping the positive directly to the starter,if it starts,the solenoid is bad.

Aug 02, 2009 | 2004 Yamaha XT 660 R

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