need help 2007 trx450er timing perfect valves adjusted right hot cam stage 2 decompressor adjusted right bike wont start turns over good compression back fires out exhaust and if i pump gas a bunch of times it back fires out exhaust and carb any ideas to get it going
Double check the basics (fuel, air, and spark). Assuming you are certain the valves and and timing are perfect, next thing to check would be fuel. Gas is on, carb is jetted correctly and squirting fuel. What does the plug look like? Strong spark?
Any changes since the last time you had it running?
How did you set the decomp? Needs to be done with a compression tester to get set right instead of the feeler gauges.
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