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Matt,
I agree with you in so far as the first P applies to the bike, must be stock appearing, etc, and also agree with limitations on the engine, must use OEM heads, Carbs, Jugs, and case(s) no blown unless factory, no fuel.
Where we disagree is that
P-P is production/production (for production bike {i.e. class} with production engine {i.e. engine class})
clearly by rule qutoed previously a special construction frame or a modified frame (iaw with current rules) with a production engine would be most properly be
A-P or M-P, clearly a class engine combination currently allowed for by rule(s), but yet no designated vehicle entry ID or records near as I can tell.
By rule 7.D.4 (pg 99, 2006 edition SCTA) engine class "P" allowed in all frame classes except "SC" which seems real fair to the factory harleys that had a factory sidecar. Perhaps this rule is a typo-inversion???
So we all rushing out to buy factory fresh production engines and sticking in modified and special construction frames?
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I can just hear the noise if we allowed a different class just by running a "production" engine in any class. Let's see....
15 displacment sizes
A, M, SC, SCS & S classes
Regular, blown, pushrod, pushrod blown, vintage, vintage blown.
Gas & fuel
What's that... 600 new classes?
I run what would classify as a production engine in my sidecar, but it wouldn't be any different because it is vintage. I know that there are not that many different "production" engines built.. I have never heard of a production blown vintage engine, but it still would be overwhelming.
I think the production class was made to make it easy for people to run their stock bike for a record, nothing more.
Matt