I bought the AMR stage 2 "rev box" from amrracing.com and when i bought it the page said it fit all years for the 300ex. So i got it, put it on, and started it up. I revved it up a bit and i instantly hit the rev limiter, i would actually say its was about the same limiter as reverese. i rode it and hit the limiter in everygear almost instantly after i shifted. I went in reverse and it had no limiter at all( or if it did, it was VERY high). I have sent them several emails and the only reply i kept getting was "you probably accidently switched out the reverese limiter box instead of the cdi box" he also said that both boxes look similar, so i went out to look, and NO WHERE on my four wheeler is another box that looks even similar to that. Did they change something for the 07 300ex's and went with a single box cdi instead of 2 seperate boxes? Sorry for a really long post, it was the only way i could explain what the real problem is.

 

looking at parts diagrams 07 changed from the earlier 300ex. cdi's have different part numbers and on 07 there is no inhibitor box.

 

So i guess that means 2 things. amrracing lied when they said the cdi box works with all years of 300ex, and it also means that i probably cant find a +1000 rpm cdi for a 07 300ex. If you know of any place that sells one for an 07 that would be great, also sparks wont modify 07 or newer cdi boxes so that isnt an option