I just got both of me 400EX's out of the shop. I had the IMS 440 kit put on, new race cam, K&N air filter, jetting work you name it I did it and oh boy WHAT A DIFFERENCE!!!

Of coarse the first thing my buddy asks is did I remove the REV LIMITER? Has anyone out there done this and isnt it potentially bad for the quad? ANY feedback would be helpful.

Thanks guys!

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For any modified EX, an aftermarket rev limiter is a must. They let it rev out higher and advance the ignition curve. You can get them from White Bros., CT Racing, and I have heard a stock on from an XR250 dirt bike works too.

 

A rev limiter is not a must. I have a 400 with a Double Barrel, K&N, 165Main, 140pilot. I had a WB limiter but took it off after changing the sprockets a little. With the gear change I rarely ever hit 9000 rpm and I still can't keep the front end on the ground. With your 440 kit you should have no problems with a gear change. A 4-stroke should be short shifted anyway and that would make the WB limiter useless. The gears are 16/37 with 18" tires. Stock is 15/38. No new chain is needed as I increased the front and decreased to rear. Good luck!

 

The only time a higher rev limiter is good is 5th gear full throttle. If you want one, go to a honda dealer and order part # 30410-kce-671 and save money over a WB.

 

If you've hit the rev-limiter, then you need a performance rev-limiter. Kinda like race gas, if you dont ping, you dont need it... But if a new rev-limiter offers advanced timing, that is something to investigate... This is kinda like a question about a "boost botttle", after 2 years,, I still dont know if it really works!

RoostKing

 

I was just wondering how much all this cost.parts,instalation? thanks