DescriptionYou can also add on our Yoshimura ST-1 Billet Camshaft for even more power. Tons more over-rev and an overall increase, over the Bore Up Kit alone. Complete installation instructions included.
■ CRF100, XR100, NSF100:
■ CRF50, XR50 :
Use of STD valve spring. Req. Modification on the cam holder might be required in some vehicles.
* Cam timing should be set by a certified mechanic to ensure proper function. Improper installation or cam timing could result in catastrophic engine failure.
These products are designed, manufactured, intended, and sold for use on vehicles that are operated only on closed course racing circuits unless otherwise noted. Use of these products on public roads or lands is strictly prohibited and may be a violation of local, state, or federal laws. Products intended for use on vehicles operated on public roads or lands are clearly so indicated.