74MM Motorcycle Cylinder Piston Ring Kits For Yamaha YZF-R1 1998-2003 XT250 YFM250 Raptor FX1000A Fit For YZF-R1 YZFR1 1998-2003 XT250 2008-2021 YFM250 Raptor FX1000A SRT1000 motorcycles; fits 74mm cylinder inner wall; piston groove size Complete pre matched ring assembly; no extra grinding or needed; convenient assembly during engine rebuild Stable elastic tension structure; reduces consumption; prevents combustion blowby inside cylinder hardness makeup; withstands continuous temperature engine operation; slows abrasion from cylinder contact machined 74mm standard size; uniform ring clearance; maintains consistent sealing between piston cylinder wall