have a 440 ex with head work and full LRD pipes need to know what kind of rev box gives more bang for the buck..

 

theirs a rev box called the dyna fs its has a programmable rev limit and 4 different timing curves. you can check it out at partsforatvs.com i dont have a have a 400ex so i dont know how good it is but i buy parts for my 300ex their all the time and they were great. when i ordered my cdi it was at my door in less then 24 hour.

 

thanks.... Enjoy the ride..

 

dyna has a programmable that comes w/4 settings already installed, and you cand modify any of them w/software for ur laptop for about 350.00. or they have a non programmable version for about 200.00 that has multiple curves installed that you cannot change. considered by many to be the best these are the way to go. best bet is to buy one through an engine builder that has already installed custom curves for your application
just my .02
dbr

 

The cam dictates the rpm, not the 89m piston or the pipe. If it is a stock cam, don't bother buying a rev box. Save the money too buy a cam.

If you have a top end cam get a rev box, but only a plus 1,000 rpm. You will not find any power on a 400ex above 10k, unless you have modded the hell out of your head.

 

yes the head has been worked over pretty good biger valves lots of porting and ploshing by tigwig.. running a stage 2 cam. so go with the dyna but do not have a laptop can u still use a desk top with a long cord?????

 

Yes. You can just bring cdi in the house and do it on your desk. You will need to purchase the programming kit which includes software and cord.