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If original...OP's '86 should have the older 32mm, metal slide Keihin CV's.
Have the pilot screw "anti-tamper" caps been removed? Pilot screws, springs, washers and tiny orings removed for cleaning (along with the pilot jets)? Then replaced in correct order? Set at 2.5 turns starting point?
If this is the case...other internal carb issues exist.
What cleaning and flushing methods were used during your clean procedure?
Agreed, 250's valve clearances are a critical tuning parameter.
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