I have been plagued with a very similar problem recently with my ox66. I was absolutely certain I found the problem by cleaning my injectors, but nope as of yesterday the problem is back, and that's why I'm up at 4am frankly.. it's got me losing sleep over it. !! I will now be putting a pressure gauge on it and see what that brings as Ferm suggests, but just because I decided to check my work and go over everything I've done already yesterday I pulled all 6 new spark plugs and found the bottom right ( not sure what number cylinder) plug to be spotless unlike the other 5, which makes me think it could be as Bradford mentions ,I'll let ya know.
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1988 Grady White Seafarer Yamaha 250 ox66 on a bracket
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