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Discussion Starter · #1 ·
006 trx 450 er with new valves and piston, ran great at first and the became hard to start. Recheck timing and valve lash and both are ok. Now I get sluttering and backfire thru intake. I also noticed arching on the spark plug wire.
 

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Discussion Starter · #2 ·
006 trx 450 er with new valves and piston, ran great at first and the became hard to start. Recheck timing and valve lash and both are ok. Now I get sluttering and backfire thru intake. I also noticed arching on the spark plug wire.
I am running 178 main with out lid, 48 pilot and 75 leak jet at 600 ft elevation.
 

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Well fix the Spark Plug wire, Another thing is to check the Wire that connects to the Coil if that comes loose it will miss fire and sputter from vibration.

Make sure that your Timing did not jump.

Another thing to check is o make sure you did not for some reason mix up the Cam gear for an 04 TRX450R Cam gear. I have seen that happen where someone put the Wrong cam gear in and their timing was off after a few revolutions because the gear is different size.
 
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