Question about Yamaha 2010 Raptor 90

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Bought a 2010 yamaha raptor 90 been sitting up awhile and would not start pull the carbuerator off cleaned pilot jets with carb cleaner well after that put new plug in cranked right up will idle but s

Ineed to know if that's the problem

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Why do i have to run my 96 polaris 400 2x4 atv in half choke when i ride


If you haven't taken that carb apart and cleaned it in awhile - more than likely your jets (what's used to pick the gas up out of the bottom of the carb (the bowl) are clogged up. You can pick up a can of carburetor cleaner with a wire basket inside from any major parts store specifically for carburetors to soak in. The size of a paint can & around $20. Soak the carb in that for awhile after disassembling, make sure none of your ports are clogged - air compressor gun or you can also use keyboard cleaner - air dusters. You want to verify that air can pass through all those ports properly and blowing air through them is how you do it. Carb does need to be completely disassembled to do this. The jets in the carb suck up fuel due to the vacuum the engine creates turning over. Once it starts spinning - it builds up a little suction and everything is fine. When the jets start to clog - one of the ways to force the carb to pull harder is to work the choke. The only thing that choke is doing is operating the butterfly. When the choke is on - the butterfly closes. Making all of that suction stay right there in the carb. Once the bike starts to warm up - you release the choke - and the butterfly will open - allowing more air into the system. You're running at half choke - butterfly half closed - to force those jets to pull harder. If they were clear? No need to run at half choke. Hope that broke it down for you - All The Best, Justin M. 17 South Industries, LLC

May 03, 2016 | Polaris ATV

1 Answer

2010 Yamaha Grizzly 350 won't idle. will run but idle has to be left on


Sounds like your idle/slow speed carb circuit is plugged. A carb cleaning and spraying all passageways with aerosol carb cleaner should find your lost idle

Oct 29, 2015 | Yamaha 2010 Grizzly 350 Auto 4x4

3 Answers

2004 automatic arctic cat 500 atv with a keihon carborator - starts up and idles. drive and stop and it boggs down and stalls. try starting and it starts right back up. Any ideas?


sounds like it has been sitting, if you have never rebuilt a carb, best to bring it in,, the main jet is probably all gummed up,, you can try draining all your tank gas,, spraying carb cleaner into the carb after removing air cleaner but that really wont help out the main jet.. Stabil is a good product for gas if you are going to store your ride for awhile, it also acts to clean carbs while using a small amount when you fill up.

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2 Answers

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

2 Answers

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

1 Answer

Not gtting fuel


service carb, carb float needle and seat, petcock, main and idle jet in the carb and you should be good as new.

Mar 15, 2014 | Yamaha 2007 Raptor 700R GYTR Edition

1 Answer

I have a small 4wheeler that is hard to start and will not idle it will run at speed but if you stop it doesn't idle it dies


Your pilot jet in the carb is plugged up or to small you will have to pull the carb out and clean it if you have a wire brush you can use 1 of the needles off it that will fit in the tiny hole in the pilot jet push it through and then spay carb cleaner through it and the main jet put back together and it should run fine

Nov 26, 2013 | RTO 125cc Full Size Adult Quad ATV

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

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