Achieve perfect tuning for your SR400 with genuine quality!
Manufactured at Yamaha's designated factory with equivalent quality and quality control standards.
This is a high-precision, high-quality, MADE IN JAPAN 0.5mm oversize piston for the SR400.
Manufactured using the same low thermal expansion casting method as the genuine part, unlike short-lived aftermarket forged (machined) oversize pistons,
this oversize piston offers the same long-lasting durability as the genuine piston.
No need to fabricate and replace cylinder sleeves for repair by swapping to genuine STD size pistons.
Replaces discontinued genuine cast oversize pistons in all sizes,
allowing complete restoration of SR400s where proper repair with cast pistons was no longer possible, using only cylinder boring/honing.
■Compatible Models
All model years of the SR400
■Recommended Clearance
0.049 ～ 0.055mm (0.0019 ～ 0.0022 In)
■Contents
〇『Casting Long Life 87.5φ Piston for SR400 +0.5mm (Single)』
〇『87.5φ Piston Ring +0.5mm for SR400/500 Casting Long Life Piston』
〇『Piston Pin for SR400/500 Casting Long Life Piston』
〇『Genuine Piston Pin Clip』 × 2
※These are delicate parts. Handle with care during storage and assembly.
※Installation on an SR400 increases displacement to approximately 409cc.
※Genuine Yamaha piston pin clips can be used (included in this full set).
．Genuine Part Number 93450-22027
※Entrust boring, honing, and assembly work to a reliable engine machining shop or motorcycle shop.
Specify the recommended clearance: 0.049 to 0.055mm (0.0019 to 0.0022 in) when requesting work.
※After assembly, always perform proper break-in driving before normal operation.
※Failure to perform a break-in period before normal operation may cause engine seizure or premature wear.
※We cannot answer inquiries regarding registration, applications, or vehicle inspections related to displacement increases. Proceed at your own risk.
※While assembly as a high-compression specification is possible for SR500, XT500, and TT500 models, durability may be reduced.