I want to put a different motor in my 400ex!!! [Archive]

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z400ex

11-05-2002, 11:42 AM

I am dieing to put in a different motor in my 400ex thats faster. I dont no what motor to consider.....cr500,cr250,600,xr650.
I am not sure about vibration tho....i mean im sure that any motor that i put in will vibrate my teeth out but which motor do you guyz think is best. I liked the idea of the cr500 becuz i can get a old year that will cost not much at all but they have no counter balancers and i dont want my bike to vibrate apart...or will it?? Any suggestions or opinons and pics will help me out alot...thanx

knighttime

11-05-2002, 12:05 PM

just mod your existing engine, make it a 406 416 425 or even a 440. get a different cam as well.

Dune Surfer

11-05-2002, 11:08 PM

I saw one with a Banshee engine. Sweet!!!

11-09-2002, 10:44 AM

Id go with a TRX 250R or a newer CR 250 motor.We are in development with a 400EX frame with a TRX 250R motor.It seemed a bit easier to do that than CR 250 but a CR is a little bit quicker motor.Id go with the CR but you may have a problem with a kick starter,a flip seat may have to be made.

racerx573

11-09-2002, 03:44 PM

The CR would also virbrate your teeth out!!! Any CR would since theres no counterbalancer. I'd go with an R motor or an CRF motor, they have both been done before and theyre quite easy to put in.

11-09-2002, 03:49 PM

CR motor dont Vibrabrate that bad if you do it right we have enginered antivibe engine mounts that are chromoly reinforced

Juggalo

11-10-2002, 09:39 AM

you should go for the big bore 4 stroke. they won't vibrate as bad and i have seen some ex's with that done to em so there are definately people who can help you if you run into a problem.

11-10-2002, 10:20 AM

I have learned one thing, by the time i would have my 400ex as fast as i want it, i would have to spend over 3k. so im just gonna sell it and get something faster

Ride400

11-11-2002, 08:33 PM

get a new cr250, they are sweet

11-12-2002, 12:56 AM

the xr650 is counterbalanced but you will need to modify your frame to fit

spincr4hire

11-12-2002, 08:36 AM

Originally posted by EXracer8601
I have learned one thing, by the time i would have my 400ex as fast as i want it, i would have to spend over 3k. so im just gonna sell it and get something faster

Yep, just buy something faster thats liquid cooled.