[dilligaf29]

so my 2002 400ex has been in my garage for about 4 years now :r_c: .engine was rebuilt but buddy didnt change my timming chain . easy fix just no motivation to work on it .i came across a 2006 400ex motor running on cl lol so i bought it .i had to was cheap money my question is can i just toss it in my 02ex with out changing harness or any mods .i just want reverse:icon_ rofl: let me know thanks every one

 

[SlammedRanger]

There will be a few small things wiring harness wise that would be different. If you just want reverse you will be fine. There are 2 plug connectors down by the neutral switch. The other is a reverse switch. A couple things to note. The sprocket on the engine is different so if it dosnt have it you will need one for am 05+. The internal gearing is also different so you will want to adjust your rear sprocket to the factory 05+ size. Aside from those few small simple things your good. Did the new motor come with the reverse switch and cable?

 

[dilligaf29]

yeah grabbed the cable, wirring harness and motor for 300

 

[SlammedRanger]

Cdi box will also be different.