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I always wondered which part in the engine breaks first when overrevved.
I know the shim-type 1127s are prone to spitting the shims out, but what about the screw & locknut ones? I know Yamahas bend their valves first and Kawasakis are prone to bending their conrods. Does somebody know what happens to an oilcooled motor when accidently overrevved due to shifting down from high speed when racing? Who's done it and what went wrong?
 

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When I was racing my old '86 the circlip on the shifter failed during an upshift and I saw the tach needle bounce off of the zero pin, 15000 revs? The exhaust valves floated, made intimate contact with the piston, snapped the valve heads off, mashed them around in the combustion chamber for a while, then spit one out what was left of the exhaust port and punched the other one through the piston into the sump where the crank smashed it again. It was pretty cool except for all the damage that it did and the money it cost. O.K. it wasn't very cool at all. Troy 341
 
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