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Discussion Starter · #1 ·
My Big Bear 400 is having a problem. It will rev in neutral fine and 1st gear, but I barely give it fuel in 2nd and it starts backfiring and guys behind me said they can see black smoke. 3rd,4th, and 5th all do the same thing. I have to prematurely shift in order to get any speed which tops at about 40km/h and cant accelerate because it sounds like a popcorn machine banging and popping.

I tried to climb a hill and only got to the crest when a friend had to push me so the bike wouldnt flip backwards. In that instance even first gear wouldnt give me any power.

Any help would be appreciated, thanks.
 
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