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Product Detail
Specification:
Piston Cylinder Clearance: 0.060-0.080mm
Manufacture Method: AL Forging
[Components]
Yoshimura Piston
Piston Ring Set
Piston Pin
Circle Clip SetHead Gasket
Manufacture Method: AL Forging
[Components]
Yoshimura Piston
Piston Ring Set
Piston Pin
Circle Clip SetHead Gasket
[Description]
The new SR500/400 Piston KIT has been developed by Yoshimura and Wiseco.
High strength forging is adopted to enable long term use in harsh conditions.
The durability and output performance have been dramatically improved compared to the previous model.
Maximum performance is achieved when the ST-2 camshaft is installed in the SR500.
Yoshimura PistonStock PistonDisplacement [cc] 418 (SR400)/522.6 (SR500) cc399 (SR400)/499 (SR500) ccPiston Diameter89Φ87ΦReference Compression ratio8.5: 1 (SR400)/10.3: 1 (SR500) 8.5: 1 (SR400)/8.3: 1 (SR500)
High strength forging is adopted to enable long term use in harsh conditions.
The durability and output performance have been dramatically improved compared to the previous model.
Maximum performance is achieved when the ST-2 camshaft is installed in the SR500.
Yoshimura PistonStock PistonDisplacement [cc] 418 (SR400)/522.6 (SR500) cc399 (SR400)/499 (SR500) ccPiston Diameter89Φ87ΦReference Compression ratio8.5: 1 (SR400)/10.3: 1 (SR500) 8.5: 1 (SR400)/8.3: 1 (SR500)
Caution
- Cylinder boring is required (stock 2mm oversize).
- One YAMAHA genuine part (3HT-11351-00) is used as base gasket for both 500/400.
- When using stock carb, the main jet number should be increased by 2.5.
- Cylinder boring is required to install Yoshimura piston kit. This work is very important, so please ask a reliable factory or shop to do it, and strictly adhere to the dimensions specified by Yoshimura.
- One YAMAHA genuine part (3HT-11351-00) is used as base gasket for both 500/400.
- When using stock carb, the main jet number should be increased by 2.5.
- Cylinder boring is required to install Yoshimura piston kit. This work is very important, so please ask a reliable factory or shop to do it, and strictly adhere to the dimensions specified by Yoshimura.
