UPDATE!

EB Mods JX-21 head buttons are now in stock!

Here is the dyno graph of the JX-21 before and after the EB Mod JX-21 head button. The motor makes significantly more power across the entire RPM range. The motor was tested with the Mugen Ninja JX-21 2042 pipe (same as an OS 2060) and the Mugen Ninja JX-21 "L" bent shaped header. Part number on the pipe is Mugen part # JX15001 and the header is Mugen part # JX14002.

The EB Mod JX-21 Head Button will also fit the OS V-Spec and OS Speed engines.

Do not use the stock head shims with this modified head button. The EB Mod JX-21 head button only uses one 0.004" (0.1mm) copper head shim.

For those of you that want to trade up a NEW, un-used head button for the EB Mod JX-21 head button, you can send in your head buttons to the address posted on my website. Once I receive your head button, I will issue you a store credit via coupon code for $20 off your order.

EB Mod JX21 Head Button