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02-01-2012, 05:16 PM
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Junior Member
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Member #22829
Join Date: Jan 2012
Location: Vernon [Rockville] CT
Posts: 21
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Trailboss 250 2x4 two-stroke backfiring
Hi all, I'm 16 and I bought my first ATV back in the late fall of 2011. My problem is I can't get it to stop backfiring! I just ordered a new carb rebuild/needle kit and will see if that will help to fix the problem. Any advise?
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02-01-2012, 07:43 PM
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Super Moderator
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Member #193
Join Date: Feb 2009
Location: Port Angeles WA
Posts: 11,430
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Welcome to the board! 
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02-01-2012, 08:31 PM
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Polaris ATV Junkie!
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Member #20681
Join Date: Nov 2011
Location: Dallas, TX
Posts: 515
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Does it backfire when you let off the throttle? If so, it could be that the throttle cable is #1 getting slightly stuck, or #2 it needs to be adjusted.
If it is getting stuck, it is emulating 'being stuck wide open', and trying to kill the engine while there is fuel being brought into the engine. (I had this problem on a 2001 Scrambler 400 after I bypassed the oil pump, but neglected to run a single throttle cable. the stock throttle cable is dual pull, one to pull on carb, one to pull on oil pump.) I ordered the single cable for it.
If yours is getting stuck, you need to try to lube it first. If that doesn't work you'll need to get a new throttle cable.
This video explains it better than I can put in words.
Video: Polaris ATV Thumb Throttle Maintenance Tips | eHow.com
Additionally, here is a link discussing the ETC.
Adjusting Throttle Control
Good luck!
__________________
2012 Sportsman 500, Red.
Highlifter HD Springs all around, Moose pregressors on front (not activated). EPI 'patv1' primary clutch spring, UNI air filter w/ PJ-1 oil. K&N Model KN-303 oil filters. Bikemaster foam grips.
-------------------------------------
My ATV-GURU bumpers ARE FOR SALE, front and rear, BRAND NEW. Me a reasonable offer and they are YOURS.
(As you probably already know, they are currently unavailable from TheAtvSuperstore.com /ATV-Guru for an undisclosed amount of time).
http://www.polarisatvforums.com/foru...500-800-a.html
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02-01-2012, 09:22 PM
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Extreme ATV Enthusiast
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Member #16228
Join Date: Jun 2011
Location: Winnipeg Manitoba Canada
Posts: 227
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InTake Boot? Check for Hair Line CRacks
__________________
2011 Polaris Sportsman 500 HO TRG
2005 polaris predator 500cc
1997 polaris xplorer 400
1977 yamaha it175cc
1994 Suzuki RM250
1982 Yamaha YZ250
Please Check out my Youtube Page. subscribers & PM's are always welcomehttp://www.youtube.com/starpuss
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02-07-2012, 04:51 PM
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Junior Member
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Member #22829
Join Date: Jan 2012
Location: Vernon [Rockville] CT
Posts: 21
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update
Hi guys, thanks for the great advise. I checked the throttle/oil cable[s] and they were working great. I don't think the rubber intake boot has any cracks, but I will check that. I installed the rebuilt carb, a brand new airfilter, a new gasline, fuel filter, and oil filter. And it would not start! I checked the spark, and sure enough has intermittent spark only about once every 2-3 seconds! I took off the pullstart/side cover and the flywheel is stuck! My three-prong puller won't fit into the two holes in the flywheel. So I can't get at the stator. I'm wondering if some of the wiring is messed up. What should I check first?
Thanks a lot guys!
Peter
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02-12-2012, 04:45 PM
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Junior Member
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Member #22829
Join Date: Jan 2012
Location: Vernon [Rockville] CT
Posts: 21
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Hi guys, I just finished rewiring the lights and indicator-bulbs. I also remembered that (a month ago) when I replaced the coil and CDI box, I could not get the bottom half of the coil on tight, the wrenches just did not fit. So I tightened up the coil, and now it runs like a Honda! (A Honda chainsaw) It rips! Thanks for all the great advise!
Peter
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02-15-2012, 04:52 PM
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Junior Member
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Member #22829
Join Date: Jan 2012
Location: Vernon [Rockville] CT
Posts: 21
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Hi guys, I put a new battery in "The Boss" and fixed the headlight. When driving I heard a thumping coming from the clutch/belt shroud, I started to take the shroud off and then got interpreted. So I'm going to try to fix whatever that is tomorrow.
__________________
Peter Lindblom
The proud owner of an 89 trail boss
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03-06-2012, 10:45 AM
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Junior Member
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Member #22829
Join Date: Jan 2012
Location: Vernon [Rockville] CT
Posts: 21
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Hi guys, the bumping is just the nicks in the older belt making some noise, no big deal.
__________________
Peter Lindblom
The proud owner of an 89 trail boss
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03-06-2012, 12:01 PM
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Polaris ATV Junkie!
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Member #11247
Join Date: Jan 2011
Location: Michigan
Posts: 1,035
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If your old belt is beat up, try getting a new one. You might be shocked at how much power you were missing from the old belt slipping.
__________________
2011 Sportsman 500 H.O. - Guru brush guard, 26" original Big Horns, gutted muffler, Polaris 2500 w/synthetic line/hawse/winch saver, Polaris HD springs, Polaris heated grips, Glacier III 60" plow, Quadovator reverse mod, 3 headlight mod, Polaris rear rack extender, rear L&R cargo box, HIDs
2011 Trail Boss - HIDs SOLD
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