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 Topic: Mc28 misfire or carb issue?? 







jester

 
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Mc28 misfire or carb issue??

jester » Thu Aug 04, 2005 3:38 am

We have a 94 mc28 with JHA pipes and HRC 030 card otherwise it's stock.(motor's fresh)

Running a 142/145 mains, stock needle, 40 pilot with stock powerjets and it's pretty well perfect colour with no issues on acceleration at all. Starts fine as well.

Heres the wierd part: Its perfect running at 0-1/2 throttle, but as soon as you open wide open it goes onto one cylinder, doesnt stutter it basically runs to one cylinder (or goes flat on power. You role off and it picks it back up, happens anygear, anytime).

The front cylinder is black (plug) but still sparks under 1/2 throttle. I have changed the plugs and it's the same.Havent replaced the plug cap yet.

So basically its running perfect on the upper cylinder and the lower one's fouling at wide open throttle.

Powervalves and oil pump are set perfect.

Any ideas?

Gonna swap the plug cap tomorrow and possibly switch the coils to check them.

Anything else to look for? Pickups? Possible stuck ring?

Thanks in advance.
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