Other Kaw 900 and 1100 differences

[SmittySX]

I was going to post this on Pwc but I like you guys watt better...

what are the differences between Kawi 1100 and 900 motors? Is it only bore size? What parts are interchangeable?
can I put and oem 1100 top end on a good 900 crank and cases?

thanks in advance.

 

[kevbo]

As I remember, the case, cyl, and exhaust are noticeably different. I do not know what parts interchange or how well they will work.

 

[restosud]

no similar parts but can be made to work.
900 cases have 1 rear left locating dowel in different spot but that can be fixed.
the ramps on upper case to the main transfers are much smaller but can be modded also.
900 use small pin pistons so rods are different but the rest of crank is similar.
900 head can be recut to fit.
ex manifold will work
900 intake will work and iirc doesn't have the crossover pipe.
900 cylinder would need new sleeves and matching to the case transfer ramp.
chamber is shorter but will work with correct headpipe

 

[SmittySX]

So basically completely different motors... Thanks!

 

[Thumper333f]

How about electronic wise? I'm swapping a 900 into a 1100 ZXI hull and was planning on using the 1100 ebox/ electronics. Thanks in advance for any advice