What other larger displacement engines have been found to fit the frame?

had the same question when i first got here.
it appears that there are no readily swappable motors.
but as dgyver says here
http://www.gstwins.com/forum/viewtopic.php?t=16984

QuoteSome mods that I have done:
ignition advancer
full exhaust
cams
high compression oversized pistons
larger carbs
milled head
ported head
k&n air filter

other's have done:
gsxr 4-valve head (I am building one now)
turbo
nitrous

I am working on a bored & stroked motor.

How much money ya got?  

Oh, I dont want to put anything too big in it.........Say a 77' KZ1000 engine or something

No but I would like to get something in the way of a Suzuki 650 or and older GS750 engine I loved the power of my old GS750 well and my 77 KZ but I know there is no way in hell that is going to fit

Will have to just find one and mesure it out and see what I am going to have to build if it will fit and line up.

I thought about modding the engine but you will spend twice as much to come up to what a larger engine would produce, IMHO

thanks,

Mike

it would be sweet to use an older inline 4, early 80's gs 750e?
you would just need some wicked brackets  
i had a friend put an old kz750 in a go cart, like the off road kind, it was pretty fast.
just make sure to post somthing if you get somthing crazy to work, i'd love to see it.

and good luck!

Quoteearly 80's gs 750e?

I miss my 82 GS750E, it had an 83 Katana Engine in it. good for about 140 then the carb bowls go dry.