RTO 125cc Full Size Adult Quad ATV Logo

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Posted on Aug 23, 2010
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Feels miss on half to full throttle - RTO 125cc Full Size Adult Quad ATV

1 Answer

Scott Tx

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  • RTO Expert 604 Answers
  • Posted on Mar 29, 2014
 Scott Tx
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Joined: Oct 11, 2008
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Your main jet is dirty. clean the carbs.

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0helpful
1answer

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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2000 big bear 400 spits and sputters blows gas out back of carb into air box at half and full throttle put on a new carb and piston rings

Sounds like the carb may not be completely clean...Did you get the GENUINE OEM carb??. When someone tell's me they replaced the carb (why?) .. I have been repairing motorcycles and ATV's for 45 years. only replaced 3 carbs in that time frame..ALL the others I was able to clean and repair...- I get the feeling someone is guessing at how to fix an underlying problem?? Did you use all new OEM gaskets? Did you remove the piston to clean it ( bead blast the ring lands?).. is the piston on in the correct direction??. rings on correctly? .. hone the cylinder?? .. check the valves for leakage?.. All bolts/nuts properly torqued?, ..OK.. as you can see there are many variables that need addressing before any kid of accurate assessment can be made!! My suggestion is to find a competent factory trained mechanic and pay him for his service!!
0helpful
1answer

2000 Yamaha Kodiak 400, was running fine and in an instant it went to half throttle, starts fine idles fine. been this way for 2 years, I run it almost every day, air filter is clean, new plug

Sounds like a frailed throttle cable, or that it might be rusted or mucked up with something. Would undo it on carb and see if it has full throttle movement on the cable. If you have not done this yourself before best to have it done professionally or do some read up good luck hope this helps
0helpful
1answer

My 2000 Yamaha blaster 200 runs good at half throttle but bogs after half throttle

check for air leaks around the air filter and/or clean the carb
Dec 09, 2016 • ATVs
1helpful
2answers

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
Jan 06, 2016 • ATVs
1helpful
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Do I need a top end rebuild? I ride a 2007 Suzuki LT-Z 400 and losing power at about half Throttle

No, it is either an electrical problem or fuel delivery problem.
May 26, 2014 • ATVs
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Cleaned cab on my yamaha 350 wolverine, now it dies when trying to shif into gear. It sat with bad gas but ran and would miss fire so I cleaned it. Now it won't stay running. Smoke is coming out. If I rev...

pull your plug and see if its wet after it stalls. sounds like its running rich if you're seeing smoke. check the float height. check for clogged air filter.
Oct 15, 2017 • ATVs
0helpful
1answer

At full throttle it starts to miss and lung back and forth

if its EFI its an injector, it not fuel injected, its a carb issue

If you need further help, reach me via phone at https://www.6ya.com/expert/allen_b068623c5003aa4b

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Override switch issue

sounds like it thinks it stuck in reverse
Aug 09, 2017 • Polaris ATV
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