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 liners for repair by swapping to a genuine STD size piston.
As a replacement for the discontinued genuine cast oversize pistons in all sizes,
it allows a fully restored SR400—previously unable to receive proper cast piston repairs—through cylinder boring/honing alone.
■Compatible Models
All model years of the SR400
■Recommended Clearance
0.049 ～ 0.055mm (0.0019 ～ 0.0022 In)
■Contents
Piston × 1
※This is a delicate part. Handle with care during storage and assembly.
※Installation in an SR400 increases displacement to approximately 409cc.
※The piston pin clip can use the genuine Yamaha part (included in the full set).
．Genuine Part Number 93450-22027
※Please have boring, honing, and assembly work performed by a trusted 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 break-in 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.