Forged Racing Piston Kit (12.5:1 Compression, 102mm) for Yamaha Raptor 700 - #530146-1
Part Number: #530146-1.
Bore: $4.0157\text{ in. / }102.00\text{mm}$ (Standard Bore, high precision).
Compression Height (Comp. Ht): $1.125\text{ in}$.
PO #102MM 12.5: This confirms the 102mm Bore and, most critically, the 12.5:1 Compression Ratio (a very high, race-level specification).












