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Prevents axle from turning when torquing down axle which prevents change of belt tension
This fixed the problem
7:1 compression ratio up to 10
(1) Black rubber valve spring collar
Comes with a 4" diameter body
JT Front Sprocket 578.15 - Yamaha: 90-95 FZR400RR (520); 92-96 SR500 (520) 510672 Prevents axle from turning whenJT steel front sprockets are manufactured using Japanese SCM420 Chromoly or C49 high carbon steel. Accurately machined with the tightest of tolerances to guarantee a perfect fit and chain alignment. Fully heat treated
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