Currently have Hepolite 4173 (86.4mm) but have been suffering with seizures (the bike, not me).
Done 100 miles so far. Bike always starts after a few minutes, not sure what my options are here?
There is 5 thou clearance top and bottom, the rings are free.
Piston for short stroke 1933 VH500
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Simonpsmith
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Roger Gwynn
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Re: Piston for short stroke 1933 VH500
I would suggest honing the bore by half a thou, (.0005"). .005" is the bottom limit for clearance and I would aim for the median of .006". My VA used to seize if it was thrashed, took half a thou out and it has never misbehaved again, well not by seizing anyway.
Roger Gwynn, caretaker of the club's works drawings and machine register, membership secretary 2015-26. Director of AOMCC, Draganfly Motorcycles, Craven Equipment and Supreme Motorcycles mostly retired.
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Simonpsmith
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Re: Piston for short stroke 1933 VH500
Thank you, Roger.Roger Gwynn wrote: Thu May 14, 2026 11:27 am I would suggest honing the bore by half a thou, (.0005"). .005" is the bottom limit for clearance and I would aim for the median of .006". My VA used to seize if it was thrashed, took half a thou out and it has never misbehaved again, well not by seizing anyway.
1933 VH500
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