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Discussion Starter #1
hey I'm hoping I can get some help here .I have a 2001 400EX I just rebuild the top end and when I go to start it it takes some time for it to get on awesome I have a backfire coming from my carburetor . it stays on for about a whole minute and before shutting off it backfires through the carburetor. So I took the carburetor out and rebuild it I got a 42 pilot and a 160 Main Jet it has yoshimori exhaust system I put a new high performance CDI box it also has a hot cam also I've been trying to adjust the carburetor and I just can't get it. does anyone has a suggest
 

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Discussion Starter #3
I already put it on timing I'm really stuck I don't know what it can be
 

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Discussion Starter #5
Thanks I just finally had time to do my 400EX and you guys are right it was definitely off timing
 
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