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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?
 

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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.
 

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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!
 

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