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80 750 to 1100 conversion questions

  • Thread starter Thread starter Cdnpt1
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Cdnpt1

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Hello all, I am going to look at a very nice 80 gs750e next week, only issue is, according to the seller, the engine is siezed. I have no problem with that as I have a solid 750e sitting in my garage that I wil just transplant the bodywork onto for now. So, the questions are: does anyone make a 7 to 11 conversion "kit"? What all will I need? I am assuming some things here, mainly that I will need a set of 1100 jugs, pistons, complete head and cams, new cam chain, gaskets etc. Are there differences in head size/shape that will change frame clearance? Are there any threads here that show what/how to do this? I did a couple searches but came up dry. Any help would be appreciated.
 
For some reason I thought the only difference between the 750 in the 1100 in those years was the bore. I figure a complete engine would be the cheaper way to go anyway
 
nope. A complete Motor swap will be needed if you want liter. Think biggest you can get out of a 750 is 850, maybe 900... Someone chime in on that.
 
Not sure I would want a 1100 on a 750 bottom end. the 750 is friction bearing and the 1100 is roller bearing (80-81s).
 
Not so much worried about that, sounds like it isn't an issue anyway. When the time comes I will go looking for an 1100 motor to transplant.
 
So what I'm hearing is the similar year 1100 motor is a bolt in? Sounds almost to good to be true.
 
They should be, from what I understand after some more research, the motors have only internal differences so it should be a straight across swap. If I am wrong(which isn't unusual) someone will be along to point us in the right direction.
 
You'll need 1100 carbs if you want the thing to play as an 1100. They'll need the front part of an 1100 airbox. And the forks are a bit spindly for all that extra oomph you'll get. And the swinging arm is a bit weak - nearly the same as the 8 valve 1000 so not a killer deal but still less than I would want.
 
I just read that the only issue with the 1100 in the 750 frame is the bottom mounting bracket under the crank doesn't line up so a new bracket needs to be fabbed.
 
Cdnpt1 said:
I just read that the only issue with the 1100 in the 750 frame is the bottom mounting bracket under the crank doesn't line up so a new bracket needs to be fabbed.
Click to expand...
Yup, thats the only mount that doesn't line up. Some guys run without it. When I did my swap I already had pods, so no airbox issues, and my V&H header fit fine. The electrical connections are mostly the same.
The 1100 has a much longer stroke and the bore is only 5mm bigger than the 750. That makes the 1100 a super torque monster compared to the 750.
I also swapped the front end and rear swinger over to help cope with the extra torque.
 
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