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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
piston failure
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<blockquote data-quote="passenger0_0" data-source="post: 23742" data-attributes="member: 208"><p>Certainly looks like a severe detonation problem with all that metal sprayed off the piston - note the most severe damage occured in the zone above the top ring where there is trapped unburnt gas. Did the power drop off just prior to this problem occurring? Given it occurred on the same side as the spark plug suggests a local hot spot perhaps induced by running with an open throttle due to heavy load? Was the plug range too hot? Did you have an airleak in the inlet manifold or was it a really hot day? Over advanced ignition timing can also cause excessive cylinder pressures which would also cause this to occur. Many factors can influence the onset of detonation but all stem from running an engine too close to its thermodynamic limit. Good luck with the repair - David</p></blockquote><p></p>
[QUOTE="passenger0_0, post: 23742, member: 208"] Certainly looks like a severe detonation problem with all that metal sprayed off the piston - note the most severe damage occured in the zone above the top ring where there is trapped unburnt gas. Did the power drop off just prior to this problem occurring? Given it occurred on the same side as the spark plug suggests a local hot spot perhaps induced by running with an open throttle due to heavy load? Was the plug range too hot? Did you have an airleak in the inlet manifold or was it a really hot day? Over advanced ignition timing can also cause excessive cylinder pressures which would also cause this to occur. Many factors can influence the onset of detonation but all stem from running an engine too close to its thermodynamic limit. Good luck with the repair - David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
piston failure
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