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Author Topic: Motorcycle tech question.  (Read 256 times)
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F-Head
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« on: July 17, 2017, 04:20:14 PM »

Two tech questions from a newbie please.

I plan to build a motorcycle in the pushrod engine class; M-PG or A-PG.

1. Can I use aftermarket or modified cases, cylinders and heads?
2. Can I alter the bore and stroke provided I stay within the class capacity limit?

Or would these changes require entry into the 'Modified' engine class A.
I know vintage pre 56 entries must use the original (or close) parts but am unclear about 56 on.
I've searched through the book but can't find the answer.

Thanks for any help, Ian 
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Stainless1
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Robert W. P. "Stainless" Steele Wichita, Kansas



« Reply #1 on: July 17, 2017, 06:49:26 PM »

SCTA event or BMST?
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Stainless
Red Hat 228.039, 2001, 65ci, MSA Bockscar Lakester with a little N20 
MSA Bockscar Lakester #1000 my fastest mile 245 and change, 84 ci turbobusa motor... but Corey's 233 MPH H/BFL record is still 3MPH faster than mine.
F-Head
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« Reply #2 on: July 17, 2017, 11:59:53 PM »

BMST but from reading both their rule books I thought the specs were the same?
All help appreciated, thanks. Ian
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Frenchinjection
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« Reply #3 on: July 18, 2017, 06:30:22 AM »

F-Head, our bike is APS-PBF 750.  It has billet head, rods, crank, block, gearbox, and cases.  It's still a pushrod.
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F-Head
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« Reply #4 on: July 18, 2017, 06:58:39 AM »

Thanks Frenchinjection.

Did you seek clarification or just go with the rule book?
And did you change the bore or stroke, or stay with standard?

Thanks, Ian
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