1978 gs750 79 gs1100 engine on a 78 gs750 frame

[Bevon]

Is it possible to cram a gs1100 onto a gs 750 frame what issues will I probably run into I'm also wanting to put the swingarm from the 1100 on the 750 as well how much fab is going to go into this ,is it worth it ,will the 750 frame twist with the power pls help I cant find anything anywhere but I know it's been done blue is the 1100 the black cafe is my 750 (bad rings If I if it will need honed or not but #1 compression is 90 #3 is 90 number 2 is 60 # 4 is 60 ) and it's probably cheaper to just swap something in 

 

[Fjbj40]

Many years ago a friend of mine put a 1000 engine in a 750 frame without much trouble. That thing would wheelie at almost any speed as the 750 is a shorter wheelbase than the 1000. The frame handled the increase in power without any trouble.

I believe the swingarm pivot bolt is a smaller diameter on the 750 vs the 1000/1100.

GSResources would also be a good place to ask the same questions.

[vizman]

6 hours ago, Fjbj40 said:

 That thing would wheelie at almost any speed

........steady now

[no class]

..... must have been a real beast then ..... all of those 90 horses unleashing thier fury !  Don't worry about the frame twisting under power , it's usually the back end of other vehicles or ditches that do that .

[gs7_11]

On ‎27‎/‎09‎/‎2017 at 1:47 AM, Fjbj40 said:

Many years ago a friend of mine put a 1000 engine in a 750 frame without much trouble. That thing would wheelie at almost any speed as the 750 is a shorter wheelbase than the 1000. The frame handled the increase in power without any trouble.

I believe the swingarm pivot bolt is a smaller diameter on the 750 vs the 1000/1100.

 

Fascinating

I'm not sure what's wrong with my bike then!

The swingarm pivot bolt is the same diameter....I've had a GSX1100 swing arm in my frame with no problems.

You're right about one thing.... the frame will handle the power, and more. My bike is plenty stable. The forks and wheels/tyres were the weak point IMO. Once I'd changed those, the handling was in another league.

[Fjbj40]

OK, I thought they were a different diameter, I am not always right!

 

If you want modern handling then convert to Bandit 12 forks/wheels /tires and brakes then! With the gs1100 swinger the Bandit rear wheel fits, no straight in but with a friend who can do some minor machining then you are set.

Its amazing how cracks in the road don't pull the bike when on radial tires, and we have LOTS of cracks on our roads where I live.

My 1000 converted is a treat to drive with the modern running gear and the brakes are fantastic!

Edited September 28, 2017 by Fjbj40

[Bevon]

I want to put a different suspension what should I look for what will fit I am wanting to get these wheels off this bike and maybe the swing arm if it will fit it's a 2000 suzuki if I on the cc .also will the motor mount need to be played with or will it bolt right up I need someone to be real detailed in explaining 

If someone can email me a thread or something bmwboy513@gmail.com I have a bunch of questions 

[Nick_C_Hotrods]

Wrong Donor bike, its inferior.  I would go for Bandit / GSXR parts or similar.

[Poldark]

Don't see how it's wrong.  Bandit or GSXR would be better, though.  If he gets the parts at a good price, and he gets his project done, it's good.

[370steve]

dont monkey about, put a bandit 12 in it 

[Poldark]

Don't build the bike you want to build; do what everyone else tells you to do. 

Seriously though, it's your time, sweat, and money going into it.  Your project.  There are some very knowledgeable people to help you through it.

[Duckndive]

On ‎25‎/‎09‎/‎2017 at 5:00 PM, Bevon said:

Is it possible to cram a gs1100 onto a gs 750 frame what issues will I probably run into I'm also wanting to put the swingarm from the 1100 on the 750 as well how much fab is going to go into this ,is it worth it ,will the 750 frame twist with the power pls help I cant find anything anywhere but I know it's been done blue is the 1100 the black cafe is my 750 (bad rings If I if it will need honed or not but #1 compression is 90 #3 is 90 number 2 is 60 # 4 is 60 ) and it's probably cheaper to just swap something in 

 

Bean there done that many moons ago the original 7-10  /  7-11 conversion loads of room as 750 had kick start making the engine a little longer than the thou / 1100 ...

all the mounts line up just one on the bottom frame rail needs moving...

here's one I made earlier "pre internet   " A Lot Earlier

 

 

  

Edited December 9, 2017 by Duckndive
spilling

[vizman]

soooo kooool Clive, soooo kool.

[Chachachad]

Holy crap!!!!!! I never thought I'd see it in its prime/beautiful!!!

Edited August 24, 2021 by Chachachad
Unfamiliar with page, can't delete it. Would if I could haha.

[Chachachad]

On 12/8/2017 at 5:08 PM, Duckndive said:

Bean there done that many moons ago the original 7-10  /  7-11 conversion loads of room as 750 had kick start making the engine a little longer than the thou / 1100 ...

all the mounts line up just one on the bottom frame rail needs moving...

here's one I made earlier "pre internet   " A Lot Earlier

 

 

  

Duckndive i think I bought this exact bike 10+ years ago with plans on learning to ride LOL. Glad I ran out of money before restoring it fully and had a couple experienced riders tell me how horrible that idea was. I bought it in Southern Indiana but it looks exactly like it. 4 into 1 exhaust, possible engine boreing, duel piston brakes with sand caked in them everywhere. Used to be sparkley blue I'm guessing but I found some red paint somewhere too. Even if it isn't, its awesome seeing a picture of such a rare bike from then. Down to the shade of yellow! I hope you see this!