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oko 26mm jetting
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Posted by: double d 1

just cant get it to run right. the plug is black,sooty looking. ive got main jets from 85 to 135 nothing helps. it came with a 50 pilot and i have a 38,40,42,44, i put the 44 in but still cuts out when throttle is whacked open. air screw is out 1.75 turns. i'll keep messing with it but its getting discouraging. thanks for the help.

Posted by: guy310

Black and sooty is too rich, but I think since you've been through so many sizes, I would take the plug out and burn that stuff off of the plug with a small propane torch and start over. After the plug is clean (wire brush helps also) run it then and start from there with the color. Black is too rich. Another easy way to figure out which way to jet is to turn on the choke and see if it improves or gets worse. If it improves you jet up, if it gets worse, you jet down.

Posted by: double d 1

as soon as i hit the choke it dies!! sounds like i need to go down some more. is the 26mm to big for a stock motor. some people here have put the vm26 mikuni on the stock engine im assuming, did anybody have any problems?