what motor will fit?

[400exwheelieboy]

hey guys i have a 2002 400ex and the power just aint cuttin it.. but i like the looks of mine just want more power .. i want a really fast motor that will fit in my frame and pretty much bolt up.

[flauge]

I think the xr600 or 650 will fit without too much modding, Im not 100% sure on the exact engine though. Theres a thread floating around here with pics of it. It looks almost like a 400 motor when its installed.:D

[400exwheelieboy]

yeah that wld be cool,but im trying to get sum sort of beefy dohc 400-450cc motor in it. because i want to be able to race in a 450 class or 400 class.. so u guys have any suggestions?:ermm:

[Groves187]

YZ400-450F motor. ss440ex makes motor mount kits for the 400ex frame. Building a Hybrid isn't cheap tho.

Nick

[86 Quad R]

stick a 250R engine in there. :devil:

[gcart2]

my buddy has a crf 450 in a 400.. he had lsr make a frame for him and then it was as simmple as bolt up.

[400exwheelieboy]

Originally posted by Groves187
YZ400-450F motor. ss440ex makes motor mount kits for the 400ex frame. Building a Hybrid isn't cheap tho.

Nick
well how much do u think it wld be for me to buy motor mounts and a complete motor .. or watever else i wld need ? i found a yz426f motor for 400$ so im set with a cheap motor

[Pipeless416]

Originally posted by 400exwheelieboy
well how much do u think it wld be for me to buy motor mounts and a complete motor .. or watever else i wld need ? i found a yz426f motor for 400$ so im set with a cheap motor

probably slow's engine lol. theres a lot more to it than just throwing another engine in there.. mounting the radiator and fan.. coolant bottles, intake, exhaust mounting.. it'll be a project and a half if you're serious about it.

[440exadee]

here is what a xr600 motor looks lke

[86 Quad R]

Originally posted by 400exwheelieboy
i found a yz426f motor for 400$ so im set with a cheap motor

does the engine even run? for 400.00 you couldnt expect much. :confused:



Originally posted by adee
here is what a xr600 motor looks like

is that your quad adee?

[440exadee]

negative its a picture off this other forum i read all the time.

[250x_kyle]

the crf motor is to tall along with ktm motors. your best bet is a yz 400 426 or 450f motor

[Groves187]

Originally posted by Pipeless416
probably slow's engine lol. theres a lot more to it than just throwing another engine in there.. mounting the radiator and fan.. coolant bottles, intake, exhaust mounting.. it'll be a project and a half if you're serious about it.

X2, building a hybrid isn't cheap. Nothing for the motor will just bolt on. Everything has to be custom made or modified. I am about 10K deep in parts and still am now done yet.

Nick

[gcart2]

id have t0o say you were wronmg ^^^^^ i have seen it. not trying to argue but i know you can. and the crf motors power and 400's handeling was a insane mix

[86 Quad R]

Originally posted by gcart2
id have t0o say you were wronmg ^^^^^ i have seen it. not trying to argue but i know you can. and the crf motors power and 400's handeling was a insane mix

try a 4 mil stroker 250R engine on one. it's WILD. :macho

[gcart2]

Originally posted by 86 Quad R
try a 4 mil stroker 250R engine on one. it's WILD. :macho

im sure that would be bad

[250x_kyle]

look at jrspawns machines there expensive arse hybrids. yes they are the 250r geometry but aftermarket ex frames arnt that cheap either. the stock ex uper frame rails are two low for the crf and ktm motor heights. with some frame rail modifications the motors will fit. the yz motors will all fit in the stock ex frame but you have to gusset in place. as far as the conversion you have the price of the motor, radiator, radiator lines, oil tank, oil tank lines, frame mods, kicker extender. other modds u will find out about as you do it. do alot of research befor you jump into it. plus with a stock ex frame you have to gusset it like no other. plus you need aftermarket suspension to handle the power. the motor has to be at the right angle in the frame as well.