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Old 11-26-2012, 06:05 AM   #3
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Joined: Aug 2010
Location: Chantilly VA
Oddometer: 718
Originally Posted by 81cr450 View Post
I'm sure I'm not the only one on here who's had the thought of a 2-stroke powered ninja 250r.
What I'm wondering is anybody "seen" any links anywhere of completed build's. Fabbing a whole bike would be beyond me, but a conversion I could manage.
I'm thinking it couldnt be much different than building an AF bike. Ideally I like the new CBR 250 r honda with a kx500 motor in it, cause the steel frame would be easier to work with & it's gotta be slimmer with a single cylinder motor which would make everything line up better kicker & sprocket wise.
If I was to use the 2008+ ninja250 I think the banshee motor would be a better pick to fit the twin cylinder frame. I've seen one of the 1st gen 250 ninja's done on youtube but it wasnt very informative & was only a buzz up & down the street
cr500 builds would even interest me , just trying find more info period.
As far as a single cylinder & vibes , it really wouldnt be any worse than in a dirtbike would it?
Thanks for any input
The 500cc 2t singles vibrate.. a lot. The counter shaft dictates engine placement and dirt bikes are considerably narrower then most street bikes. because of that Getting a functioning kick start seems almost impossible due to the frame width.

I've thought about a banshee/RZ powered 250 ninja, I even have a banshee motor sitting in my garage waiting to be swapped into something.

Originally Posted by Tosh Togo View Post
An RZ350 engine would be worth a look. It's about the same size as your EX250 engine is, but makes more power and weighs less. A Banshee engine would work just as well... you'll be making custom pipes anyway.

Pipe fitment on the twin is the issue. keeping it inside the faring would require some effort.
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