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.
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