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Can't figure out which circuit is rich.


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When I rev up my bike from an idle it is has a dead spot at the very bottom end of the powerband than it snaps out of it and revs right back up and then when I reach moderate rpms and let off it back fires. I need help on what circuits I need to rejet on. I have a 170 main, 42 pilot, 1 1/4 out on air screw. My bike is an 2004 CRF450 with pipe and kibblewhite valves, no major mods done to the bike.

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I have a 03 with the same problem.

I have been all over with jets. I even shimmed my valves with no luck.

I am up to a 172 MJ and a 48 PJ also have FS out 2 - 2.5 turns and it still does it. It is also a bit hard to start when cold. Have to kick it about 10 times

to get it to fire then it dies and have to kick 2 more it fires then dies. after the 2rd attempt it finally fires and stays running but only with choke on till it gets warm.

Hopfully Eddie can help us out

Jason

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