Piston Slap

Information relating to the Matchless G15 or AJS Model 33 750cc twin. This also includes the G15 Mk II and the G15/45
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Piston Slap

Postby G15 Roy » Wed Aug 16, 2006 9:08 am

What one of you clever chaps out there can help explain and tell me exactly how to diagnose Piston Slap on a twin?

G15 Roy
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Piston Slap

Postby paul knapp » Wed Aug 16, 2006 12:34 pm

Low revs, full advance, roll on the throttle = audible piston slap
Close off throttle/retard ignition, noise generally stops.
The "slap" is the piston moving from the front face of bore, after compression stroke, and slapping against rear thrust face of cylinder upon combustion.
Paul.
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