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 Topic: Mc28 misfire or carb issue?? 







jester

 
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jester » Tue Aug 09, 2005 3:41 am

I think the jetting is nearly spot on, the top cyl anyhow. JHA pipes, 030 card, stock airbox, de-restricted. Pulls really hard with no hiccups, but as soon as ya give full throttle it goes to 1 cyl. Role off and it picks up straight away.

145/148 mains
40 pilots
13/4 air screws
stock power jets
stock needles
13.6 float height

The top plug is light tan with the ring 1/2 way up the porcelin, the ground electrodes 3/4 almost white.

the lower one fires fine until i open the throttle wide open then it goes black or onto 1 cylinder,it doesnt foul it as i roll outa the throttle and it picks it up again.

the lower cyl was redone by someone else as well as the derestict mod and the 030 card etc..it ran fine before he had it fixed fron the sieze there.

its baffled me alot as normally i can fix these in no time but this is a odd problem.

i wnet as faar as to lean it out bigtime,138 mains and the top plug was pure white(luckily no sieze or deto)the lower one was excatly the same.soaking wet and pulled exacty the same.do you know if any of the mc21 electrical is the same?or is it possible its suckin trans fluid from the right seal?


anyway thanks for the help.
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