The '89 is a short stroke, but it is ONLY 1cc difference than the long stroke. Suzuki shortened the stroke by 4mm, but made the bore larger by 3mm.
I do not know if the other parts would change, but I think if you were able to do it, the combustion chamber would be larger and it would drop your compression ratio a lot. That would mean you would have a lot less torque.
the 89 stuff will interchange..you need to put everything from one to the other..the 89 stuff is 2x's better than the 86 stuff..we have taken 89 750 heads and put them on 86/87 1100 and made them run better because of the combustion chamber design in the 89 750..the swap should work..
The case is busted on the 89's engine and the tranny is shot. Can I swith the 86's case and tranny into the 89? The 86 also has the dry clutch so I would need to make sure that it would work in the 89 also. What are the pros and cons of the short stroke?
i would put the 89 head on the 86 bottom end...the 89 head should bump up your compression..more compression=more power!! i good street port job wouldn't hurt either...i have a friend that is a master at porting and engine building..i will put in a good word for you if you are interested...
ok guy let's back up a minute here..i have to apologize because i've been telling you wrong...i'm thinking that you had an 1100 and i've noticed after i went back and read your post again...first of all 86/87 gixxer 750 is completely different than the 88/89 gixxer 750 if you have the head already it won't work,sorry!! now 90/92 gixxer 750 will work for you...the 90/92 have bigger valves and shim style head..the 90/92 will work but it would have to be done by a good engine builder that knows about all the clearances of piston to valve and all those good things. now that 89 head would work on an 86/87 gixxer 1100.. if you would please email me and tell me exactly what you are trying to aacomplish with your bike..i like to help if i can..email
That's right, the short and long stroke 750's don't swap shit ! (Except gear box, engine covers, etc.) I just replied to the same question at www.robbynitroz.com's message board. Don't really feel like writing it all again, sorry.
Dude, you have the perfect parts for an awesome engine!!!!!!!!
First off the 88-89 750 heads have 1100 size valves in them stock. the 90-92 heads have smaller vavles and the 91-92 heads use shims. The 88-89 head has valves that are too big to use on the smaller bore engines.
Take the 88-89 slingshot head and cylinders, which have the BIGGER VALVES and larger bore, and put that on your 85-87 gsxr750 motor with the longer stroke. Put the appropriate cylinder spacer plate to restore the deck height and presto eight hundred and something cc's. Pretty cool huh
I've got a magizine article I'll post later...
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