Big Red Backfire

[Power_Ram100]

My 83 Big Red does small backfires only when decelerating like when going down a hill. I though it might be the carb so I sprayed carb cleaner and it didn’t help any. I was thinking it might be the timing but I don’t know how to change the timing. I use my trike for hunting and the backfires tend to scare the elk and deer. Here in Washington it gets dry in the summer even though I have a spark arrestor I don’t wanna start the next forest fire. Any help would be much appreciated.

[Tri-ZNate]

Don't know what to tell ya. Every trike I have ever owned backfired, and my SXs, if I run them hard, backfire when I shut them off.

[83185s]

my 185 did it all the time when i had it goin..i htouhgt the same thing u did and did the same thing (the carb) and the timing i had switched a couple times and it wouldnt run so i put it back and didnt even worry about it..it may be that trailprotrailpro carb needs adjusted or a new plug maybe im not sure

[bonkers_200s]

Play with your throttle needle.

Move the e-clip up and down untill you find that happy medium.

My 200s does the same thing, but mine is because i have an after market needle and it's not quite the same size as the stock needle.

[broook]

Backfires are "usually" caused by air leaks in the exhaust or the intake system. Check all exhaust joints from the cylinder head back to the muffler.
Also check the intake boot from the carb to the head. Try a propane torch around the intake {without lighting it of course} if the engine speeds up you have an intake leak.

[StangLX302]

I think broook is right. My 185s was backfiring like crazy. It turned out that the intake had a very small crack in the side if it in the rubber. I put a "new to me" one on it and it went away.