will a ninja 300 engine bolt straight into a 250 ninja?

[boyoboy]

anyone know offhand?

 

[DannyBoy]

anyone know offhand?

From what I was able to find, it doesn't seem as simple as just bolting it in, but it doesn't appear to be too hard to swap them either.

Personally, I don't think it would be worth your time, though.

 

[frekeyguy]

Have I done it - Nope.
Do I think its a bolt in - Yes!


First pic:
Ninja 300 doing valve work...notice the front engine mounts...

Second Pic: Ninja 250 - doing motor swap. Rotten Ronnie's bike.

 

[frekeyguy]

The front frame mounts are stamped steel and removable.
When I Swapped that motor on Jason - Rotten ronnie's bike - his mounts were twisted.

The donor bike's mounts were perfect, so even if the front mounts need some work - it would be easy job to do that.