[cgrady88]

I got a 2007 400 ex with hmf slip, unifilter w/cover still on and wondering if a rev box would help. stage 1,2,3? brand want more bottom end (drag) drop a tooth in front help?

 

[njrextreme]

I got a 2007 400 ex with hmf slip, unifilter w/cover still on and wondering if a rev box would help. stage 1,2,3? brand want more bottom end (drag) drop a tooth in front help?

A rev box will help out w/ more rpm thru the gears and advance your timing up a bit. But the best thing it will do is get rid of the no start in reverse. Nothing worse than having to go to N or 1st to get it back started if you kill it in the woods or what not. I cant remember what brand I bought. It was off ebay.

 

[tomgodd]

Agree^^^^^^^^^^ You will like a rev box. I don't run one but I have freinds that love them.
BIG GUN and Curtis Sparks are companys that make them
We also have a supporting vendor that offers parts of this nature
www.kbmotorsportsonline.com

 

[jgar]

Get a 96/04 xr 250r cdi, same thing only less $$$. You can also use a 350x cdi but it has no rev limiter.... dont blow it up!

 

[elmerkit]

It also a good future upgrade to have a rev box even with hardcore mods.

 

[838XCracer]

we have a Curtis Sparks no rev cdi on on our 300ex and works great.