Engine swap?upgrade? - Kawasaki Ninja 250R Forum
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post #1 of 5 (permalink) Old 09-02-2014, 03:43 PM Thread Starter
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Engine swap?upgrade?

So this girl ended up just giving me her 250cc ninja cause it broke down. Turns out her rods came loose in the engine. Im looking to get it back up and running but i dont really want to put a new 250 engine in it.

Does anyone know if i can fit a bigger engine in it? Like a 450 or a 600? And what i might have to do to do so.

I do have little welding experience to do something custom if need be, but id rather not have to worry about it.

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post #2 of 5 (permalink) Old 09-02-2014, 04:35 PM
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As far as a simple bolt in goes, no, not even the motor from the ninja 500 will fit, but the motors are very plentiful and cheap, so if your patience and wait you'll get one cheap.

As far as modifying something, your imagination is your only limit, just keep in mind the frame and suspension is cheesy, and won't take too much, so just be warned.

Good luck in whatever you decide.

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post #3 of 5 (permalink) Old 09-02-2014, 04:39 PM
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Will a 300 fit? But the 250s are cheap to buy. Just throw another in there and call it a day.
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post #4 of 5 (permalink) Old 09-22-2014, 10:48 AM
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the ex500 engine WILL fit, however it will take more than a few custom made engine mounts.

A 300 will also fit, but you'd need everything to run it as it is fuel injected.. and you may need to mod or fab some mounts for it. Not bolt in as far as I am aware.
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post #5 of 5 (permalink) Old 09-22-2014, 07:41 PM
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The frame is designed to hold the 250 it came with. People have successfully transplanted motors from 500's, 300's, and other model 250's. But it takes so much work. Not just mounting brackets for the engine, but mounting for an air box or pods or whatever air system you choose. Then you have to think about exhausts, you'd have to go custom with those, at least with the header. And then you're looking at buying and somehow wiring different oxygen temp sensors, oil pressure sensors, etc.

It's been done, but it just sounds too tough for my taste.

You may be best off to put in about $400 on a new 250 engine, or seeing if you can fix the current one, and selling it for around $1,000+ and putting that down payment towards a bigger bike. Much easier than putting in a bigger engine!

Really didn't mean to sound like a jerk.. lol

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Last edited by tadster00; 09-22-2014 at 07:44 PM.
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