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Author Topic: Overbore on in classic gas (CG)  (Read 1072 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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Age: 67
Location: Near Furley and Kechi KS
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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.

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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