Which is Better Yfz426 in a 400ex or

[motoman1012002]

Which is better the yfz426 motor or the crf450 motor in a 400ex chassis. Or are the motors beter in a 250r chassis. I want to build a quad with my son so he can start racing. But i want to build the bike this next year so im not in a hurry i want to do it right. Psot some pics i seen and looked for bikes but whats beter the crf or yfz motor in a 400 or 250 chassis. Post i need some input.
Thanks for all your help

[Scottie Mac]

It would be a lot easier and more than likely a lot cheaper in the long run to just buy a YFZ 450 or a TRX 450 and go from there. If you wan to build a racer, you can just buy parts and go from there as well as sell off a lot of the stock parts. I have built a YZ426 quad in a LSR frame and it is just easier to start with a stock quad and go from there.

Good luck,
Scott

[cdalejef]

the 400ex frame will not hold up to those motors for very long.

[450rboy]

the 400ex frame will hold up good. it will hold up good if you put the braces on it. and the frame should never breck.

i like your idea though

[cdalejef]

Originally posted by 450rboy
the 400ex frame will hold up good. it will hold up good if you put the braces on it. and the frame should never breck.

i like your idea though The ones I've seen, even with the gussets haven't lasted very long at all.

[Tommy 17]

the best (cheapest) way to go would be a ARENS 400ex geometry frame... 1200$

if it were me and money wasn't a issuse or time... i'd order myself a narrow 500 linkage walsh frame...