Most noticeable among STD spring rate up from mid to hi RPM. Very recommended for bore up engine and big chamber.value for money
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Looks like you access from European region.
Would you shop at webike.eu.com?
Looks like you access from European region.
Would you shop at webike.eu.com?
8.77 USD (1,398 JPY)
Delivery Information
If manufacturer have in stock, ships around 1st Jul. 2026
Yellow: Spring rate increased by approx. 3%
**Simple painting for identification is the finish of your product.It is not permanently colorfast and the color may peel off during use.
*Please select the product with the best spring rate after fully understanding the engine horsepower and peak power generation speed of the bike.
[Guide to selecting the center spring (for 50cc scooters)]
■Stock engine + stock exhaust: Stock - 3% UP
■Stock engine + aftermarket chamber: 3% UP - 10% UP
■Big bore and stock exhaust: 3% UP - 20% UP
■After-market big bore + After-market chamber: 10% UP - 20% UP
*If you install more than 10% up products to a stock 50cc engine, the acceleration feeling may become worse.
*Please review the total weight of the weight roller (re-setting) and adjust it to get a better feeling..
Renewal of conventional product!High quality silicon chromium steel oil tempered wires (JIS, SWOSC-V) for valve springs are shot peened to improve metal fatigue strength.
Stable performance even when used for a long time under high temperature.Made in Japan for peace of mind.
Points of Attention
* If there may be an instruction manual included, it will be written in Japanese.