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421 stock cylinder top end package


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I bought this top end setup from Driveline to use while I was waiting for my t-rex jug to be fixed so I could still ride. The way it ended up working out, I only put one 90 mile ride on these cylinders with about 2 hours of tuning. So in total about 10 hours of running with 40:1 klotz R50. 

 

Port timings are 196/128 with a .060" base gasket and kicking comp is about 165-170psi with included domes. Squish is .048". 68mm bore/4 mil stroke. 

 

I dusted the cylinders with a hone just to put fresh crosshatch as one just started to flash rust on a humid day here. The package will be shipped to you as a new base gasket, new head o rings, new piston rings, cylinders, reeds, pistons, and domes. Price is $425 shipped to your door, firm.

 

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