Matt here, I have to correct a statement in a previous post.
>>
Nothing over 750cc is allowed in a 750cc class (there is one exception, in the Production class, where the limit is .5mm overbore).
>>
That is actually the opposite of the rule.
This is in regard to SCTA rules only.
Rule 7.D.3 states that in all classes other than Production, a .020" (.5mm) over-bore is allowed.
Rule 7.J.10 states that in all Vintage engine classes, including Vintage Production, a .050" (1.27mm) over-bore is allowed.
There is no over-bore allowed in the non-Vintage Production classes
I hope this clarifies the answer.
If you have any more questions, email me at motorcycletechscta@gmail.com
Matt Shuss
Chief Motorcycle Inspector SCTA/BNI