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matt mac lauchlin Posted on Apr 11, 2013
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Yamaha atv 400cc runs rough off idle

Runs normal at idle pops and backfires when throttle is applied

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allen

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  • Expert 63 Answers
  • Posted on May 05, 2013
allen
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Carb is gummed up

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I start my Yamaha Banshee 350 ATV, it starts fine and idles fine but when I start riding it and gets a bit over half throttle it starts backfiring really bad. Any suggestions on what to look for? TIA

Question edited for FULL 'make model (what it is)', from 'banshee'.
Question moved from Motorcycles to correct Category.

Check spark plugs.
Clean Carb.
Check timing.

More here, it is a known issue.

https://www.google.com/search?q=Yamaha+banshee+atv+backfires

..
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either the float height is wrong, the main jet needle needs lifted or there's an air leak somewhere.
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Starts and idles fine runs half throttle when fuel is applied

Harry, dirty carb or injectors.
Check the attached links,Manuals and guides, Good luck with your Bike
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

ATV TROUBLESHOOTING AND MAINTENANCE
ATV Service and Repair Manuals
http://www.carlsalter.com/motorcycle-manuals.asp
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Engine won't idle /sometimes backfires

Check the MAF-MAP SENCER or it's a throttle position sencer is bad check both by replacing them and see if it works or the last result is idle control valve
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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!!
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