going hybird

[hondagang]

what motor an what's the easiest

[Drfat400ex]

I belive the TRX450R is supposed to be pretty easy to put in. If you wanna do something that will take some work but be badass you could do a CR500.

[J51S]

All depends on your riding style. Theres lots of motors that will fit in there but imo i think hondas should stay hondas

[hondagang]

trx450r quad motor??

[mineralgrey01gt]

I know for the 250r the trx450r motor is too tall. Not sure how much more height you have with the 400ex frame.

[chronicsmoke]

theres a 450r conversion: http://www.exriders.com/vbb/showthread.php?s=&threadid=476648 (sick work BTW J51S)

and a 250r conversion: http://www.exriders.com/vbb/showthread.php?s=&threadid=477981 (Lookin good JohnDoe)

both being completed now! I like the look of the 450r engine. Looks to be an 04/05 that engine he's using too

Ive thought about trying a KTM 300/330/380 2 stoke engine.. they are kind of hard to find though.

[hondagang]

ya I've thought about using a yz426 motor

[DragonGunner]

http://www.exriders.com/vbb/showthread.php?s=&threadid=455183

You realize you will probably have to do some fabrication an such right?
This Thread might give you a little ideal what your getting yourself into.

[250x_kyle]

if i remember correctly the yz426f motor needs to be spaced over .25 inches on the sprocket side of the motor to align the chain. make radiator mounts and if i had to do it again i would make a custom oil tank as well as make the upper motor mount removeable from the frame. i think i still have the front motor horns i made for mine. the frame rail by the rear shock mount i notched for the intake and welded in a tubular gusset and plated the tube.

[ish416]

If your thinking about swapping in a single cylinder 4 stroke engine under 600cc, just buy a 450 or Raptor 700.

[JOHNDOE83]

I recommend shoping for a complete bike so you have all the parts needed or atleast have parts to match up and re-use. You could also re-sell anything that you dont use or use it on another project.

[250x_kyle]

motor carb wireing and kick start is litteraly all he needs after that its pretty much custom. im sure you could find a deal on a bike and part out what you dont need and make your money back though.