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fresh rebuild no start help!!!

2K views 5 replies 3 participants last post by  duke416ex 
#1 ·
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
 
#2 ·
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?

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#5 ·
I would take the fuel screw to 2.5 turns out and try it again, see if it is still back firing.

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