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Discussion Starter #1
new plug, rejetted it with 168 main, 45 p, needle set 4th clip, 2 screws out on a/f screw it was running great for about two hours then it started the stumbling at around 4000 rpms and I put the oem cdi box and it seems to be a little better but not 100%. Could the dynatek cdi box go bad like that?
 

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If the different CDI box made a difference, try wiggling wires while revved at 4k rpm and see if the stumble goes away. Also check all your connections(grounds, connectors and terminals).
 

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Discussion Starter #3
The new cdi box makes it feel like a Honda vtec kick in at 3500 rpms lol any ideas?


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