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Old May 4th, 2019, 10:24 AM   #1
07pansy
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Name: Ryan
Location: Central NJ
Join Date: Oct 2018

Motorcycle(s): 07 ninja 250

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Swap 250-650

So I keep reading it’s not worth it or doesn’t fit to swap an 07 250 to any other motor. How come an 07 650r motor won’t fit. It’s only a 2cyl
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Old May 4th, 2019, 12:32 PM   #2
DannoXYZ
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Who says it won't fit? That's what they said about 300 & 500 swaps as well and plenty of people have done those.

All you need is:

- donor motor
- floor-jack to lift engine up into position
- ruler
- measure connection points for engine-mount
- cut & weld as necessary for engine-mounts
- install engine
- install 650R harness and all electronics
- voila! Done!!!

BTW, 650R engine weighs something like 145-lbs. You'd end up with bike with wet-weight in 450-lbs range, or about same as 650R.
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Old May 6th, 2019, 07:00 AM   #3
sharky nrk
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the 650R engine is a relatively poor candidate because of the layout for the airbox and FI layout - the 500 at least shares the intake and exhaust layout with the 250/300
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