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Looks like Im taking the plunge. 500cc BB 400EX


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The complete kit plus parts machining and labor is far less than even a wrecked 450. I was planning on buying a kfx700v instead but ididnt have the funds. Im figuring i pay as i go at this point. As far as reliability your probably right but im hoping that 4ST are professional engine builders

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Im talking with 4ST about machining my 400EX motor to 500cc. From what ive read this kit is quite reliable. Hoping to get this done sooner than later. $$$$$$$

Any thoughts?

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Get the 450 instead !! you`ll be happier !!:yes:cooling it will be a problem !! the 440kits are known for having cooling problems imagine what a 500cc kit will be like !

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I dont have the money for a 450. If i were to buy a quad it wouldnt be a 450. Id get the kfx700. Went riding with a modified one and a stock one. A 450 wont even come close (oh boy here come the naysayers comments)

Anyway i am doing this build in steps. I priced it out and still going to be far less than a 450r

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I dont have the money for a 450. If i were to buy a quad it wouldnt be a 450. Id get the kfx700. Went riding with a modified one and a stock one. A 450 wont even come close (oh boy here come the naysayers comments)

Anyway i am doing this build in steps. I priced it out and still going to be far less than a 450r

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Go for it man!!!! if you can keep the engine cool it will rip like no other:biggrin:

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