1993 Polaris Trailboss 350 running issues - Polaris ATV Forum
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post #1 of 7 (permalink) Old 03-21-2010, 05:47 PM Thread Starter
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1993 Polaris Trailboss 350 running issues

Hi my Trail Boss 350 isnt running right and i dont know why. It will start fun for 1 minute and move forward probaly 50 feet then stalls and wont start again. someone says it is starved for fuel but from the tank to the carb we have fuel. also it backfires constantly and the muffler pops off the engine.. please help.
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post #2 of 7 (permalink) Old 03-21-2010, 08:58 PM
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When it comes to a 2 stroke a lot of issues can cause backfiring....first and easy replace the spark plug and make sure the plug wire is pushed in tightly onto the spark plug cap, at the same time check your fuel for water in it and make sure your oil injection is working(presumming you dont pre-mix) . If that does not help take the carb apart and clean it, could be a sticking jet or floats. If that does not work your timing on your machine could be off or you could have a burnt out piston. Try the spark plug and check gas and clean the carb if that does not work let us know.Good Luck
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post #3 of 7 (permalink) Old 03-22-2010, 07:58 AM
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Does it backfire through the carb or exhaust? Is the plug wet or dry? Have you done anything to it recently? Did it just start doing this ? Has it sat all winter with old fuel or did you drain fuel and fog it?
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post #4 of 7 (permalink) Old 03-22-2010, 04:35 PM Thread Starter
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Originally Posted by Spitfire79 View Post
Does it backfire through the carb or exhaust? Is the plug wet or dry? Have you done anything to it recently? Did it just start doing this ? Has it sat all winter with old fuel or did you drain fuel and fog it?
Hi, It was sitting for 3 years and we just rebuilt the carb and got it running again. It sat so long because we kinda forgot about it in the garage. The backfire causes the tailpipe to pop off the engine. We drained the gas and let the tank dry and replaced it with new gas. The plug is dry by the way. Thanx for any help you can give me.
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post #5 of 7 (permalink) Old 03-22-2010, 04:38 PM Thread Starter
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Originally Posted by ManitobaHemi View Post
When it comes to a 2 stroke a lot of issues can cause backfiring....first and easy replace the spark plug and make sure the plug wire is pushed in tightly onto the spark plug cap, at the same time check your fuel for water in it and make sure your oil injection is working(presumming you dont pre-mix) . If that does not help take the carb apart and clean it, could be a sticking jet or floats. If that does not work your timing on your machine could be off or you could have a burnt out piston. Try the spark plug and check gas and clean the carb if that does not work let us know.Good Luck
Spark plug and cap are fine. no water in the fuel i still have to check the oil injection. THe carb was just cleaned and rebuilt and everything there works fine. Thanks for any help you can give.
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post #6 of 7 (permalink) Old 03-22-2010, 11:57 PM
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assuming your exhaust is not plugged from critters your timing can be off, also i am not totally sure how to adjust the timing but check the spark one more time see if its blue or yellow if its yellow bad plug if its blue adjust timing on flywheel not sure on specs to adjust timeing or it could be a faulty pick up coil pressuming your machine has one. I am sorry i can not be more help but i will look into more for you.Good Luck
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post #7 of 7 (permalink) Old 03-23-2010, 10:27 AM
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Sitting is a killer for a 2 stroke. The crank seals may be leaking, causing a lean condition. Popping through the exhaust is rich usually. Check choke plungers to be sure they seat. Floats set, the needle / seat may be leaking
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