ST-2M Camshaft Product # 211-40A-2251

The ST-2M camshaft was developed to bring out the best performance of the HONDA horizontal 125cc engine.
This is a bolt-on camshaft that replaces the stock camshaft.(*1)
Yoshimura ST-2 (Stage 2) camshafts are designed to have higher lift than ST-1 camshafts and the valve springs must be replaced with special ones.camshaft without changing the valve springs.
Both power and torque are emphasized at high rpm, and powerful acceleration can be obtained up to the rev limit.
Please note that fuel adjustment is required before use.(*2)

[What is Yoshimura's camshaft?]

■Unique cam profile settings
Yoshimura's camshafts are designed by our own know-how of cam profile.
The design of the profile begins with the knowledge of the standard engine specifications.
The profile characteristics of Yoshimura camshafts are determined based on the engine speed and characteristics to be used.
The next step is to express the determined profile characteristics and values.
From form to number...Yoshimura's long years of know-how lead to the profile.
A prototype camshaft with the profile created in this way is installed in the engine and checked to see if it actually has the characteristics as expected.
If the expected characteristics are not obtained, the design is redone from the beginning.After the repetition of this series of work, Yoshimura's original cam profile is derived.

■Integrated production control
Yoshimura manages the entire production process, including centering.
Camshaft's material is carefully chosen to reproduce the profile.
Heating to the product causes a distortion of camshaft, or loss of its strength. To prevent such results, cam lobes are not molded by heating.
In order to make the camshaft hard enough for the engine, the best heat treatment is selected from various methods and applied.

Unique cam profile design + consistent management of production.This is Yoshimura's commitment to the camshaft.