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Christopher Williams

99 Bear Tracker wont start, backfires.

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Hello all, 

i just rebuilt the top end of a 99 Bear Tracker 250 and it can’t get it to hit off of gasoline or starter fluid. Occasionally it will backfire. Right now I’m just trying to get it to fire off without the carburetor like I’ve done a thousand times before with other engines. Usually there is no response, but occasionally I get a backfire through the intake. ISeems like it’s out of time, but I don’t see how that could be possible. 

Here’s what I know:

1. compression 120psi

2. all timing marks are lined up after numerous revolutions. 

3. Strong spark. 

4. Valves adjusted correctly. 

Thanks in advance. 

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