So I am new here and I am looking to see if some one can help with a problem that I have.
I have an 86 trail boss that has been back firing out the exhaust when you give it gas
I have cleaned the cab many times replaced fuel lines and filter some times I will start it and it runs fine then I will shut it off restart and then it back fires or I have no throttle response after 1/4 throttle I have changed the spark plug and done a comp. test 120psi not shore where to go from here thank

 

Clean the jets in the carb.

 

Could be old speed regulator module,shorting out,or limiting when warm causing backfiring. Should be under tank area,not sure if wire colors are like 88 and later models,BUT if has a black wire,try disconnecting and see if solves problem. Good Luck

 

To me it sounds like you may have some trash in the bowl stopping up the jets. Try getting a Carb Kit for it and rebuilding it and make sure you clean the bowl and passageways good. Good Luck with it. I am about to start working on a Trail Boss 325

 

There are two black boxes under the tank one has a red and a yellow wire and the other has a black and a yellow wire last night I started it went for a 20 min ride ran great got home shut it off did a few things went started it to put away and it did not have any throttle response again so thanks every one I will unplug that wire and see if it helps and will let every one now

 

So I unplugged that black wire like you said and it seams to run fine went for a ride this weekend and it ran great thanks for the help

 

This was the early design modules that failed quite often,as far as that goes the LATER reverse limiter modules failed also! Polaris's intentions were good,but reverse limiters have never worked out,can short out and limit forward and reverse. Good luck

 

Do you think that i should see if I can Find one or is it ok to run it with out it

 

LEAVE IT DISCONNECTED,not worth paying about 60 bucks for a module that will go out again!