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I have a 1980 YZ250 that smokes more than the Marlboro man. I am using Maxima K2 at 32:1. I just put a new clutch side crank seal in it and it still smokes just as much. It also spews oil out the exhaust pipe and dirties up the spark plug with burnt oil deposits. I'm thinking that it may be sucking trans oil from between the cases, but maybe the K2 just smokes a lot at that ratio which is one of the main things I am trying to determine. I called Maxima and didn't get a definitive answer.
What oil do you use?
What ratio?
Does your bike smoke a lot?
What is your bike?
Thanks in advance for any info.