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Author Topic: Overbore on in classic gas (CG)  (Read 189 times)
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Darin Mellor
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« on: November 15, 2017, 02:04:54 PM »

Allowable overbore in this class is + .050- inches over
OEM standard bore to remain in displacement class. Further
increased displacement beyond the class limit shall place the
motorcycle in the correct class.

So if I had a 175cc engine and overbore it 0.050",which would put me over 175cc, would I still stay in the 175cc class?

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Stainless1
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Robert W. P. "Stainless" Steele Wichita, Kansas



« Reply #1 on: November 16, 2017, 12:10:05 AM »

If you have a <175cc with stock bore, and bore it .050 over stock bore size, you will remain in the 175cc class.  If you have a <175cc engine and bore it .050 past 175cc you will run in the next higher class.  The key is .050 over stock bore is allowed for cylinder repair.
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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.
Darin Mellor
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« Reply #2 on: November 16, 2017, 12:29:35 AM »

Ok thank you very much
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