GS1150 Cams & Sprockets in GS750/700 engine?

[Macmatic]

I think I remember reading that GS1150 cams fit the GS750/700 engines and that (I think) the stock GS1150 exhaust cams were better in the 750/700 engines. More power but still easy to live with.

Is this true? And are the cam sprockets the same between the engines? I've got a pair of beat GS750 cams and I was thinking about having the sprockets slotted for my GS700 project engine but I see that APE has them for $50 per pair to fit GS1100-1150 engines which might not be much more than having the used parts slotted.

What about parts swaps between the GS750 and 700? I know they are MOSTLY the same beast but is there any fun mixing and matching in the areas they are different?

Thanks!
/\/\ac

 

[dig dug mx6]

Here is what I know about the 700. It has more aggressive cams than the 750 to make up for the loss of CC's. I believe from what I've read you would be better off putting 700 cams in the 750. I don;t know about the 1100/1150 cams.

 

[oldschoolGS]

The 700 cams are slightly hotter than the 750 units- I believe the biggest difference was in the intake cam. Either way a very marginal difference and probably not worth the swap. If you are gonna do it, go with aftermarket .330 lift drop-in cams and springs. That is a much more worthwhile swap. There are no valve guide issues or valve/piston clearance problems with the .330 lift cams ( CamMotion G2 ). Add an aftermarket tensioner to any cam swap.

GS1100/1150 cams, sprockets, tensioner and cam chain are interchangable.

One note of interest- the 700cc motors have domed 67mm pistons instead of the flat top 67mm 750cc units. Suzuki did this to make up for the compression loss by de-stroking the 700cc motor. The 50cc difference is in stroke alone-bore is the same. These domed pistons when used in the 750cc motor will give 10.25-1 compression (9.6-1 for the stock 750cc motor) and will greatly enhance any cam swap. I have used this and a few other setups over the years- 10.25-1 will work fine on premium pump gas.

On my '83 I have found this combo to work very well, you are gonna quickly discover the need for different carbs- the early GSXR 34mm flatslides will work wonders.

The best stock displacement motor combo for my '83 750 was:

-10.25-1 compression 700cc domed pistons
-.330 lift drop-in cams w/ tensioner
-aftermarket valve springs
-Accell ignition
-1986 GSXR1100 flatslide Mikuni CV carbs with DJ kit and pods
-V+H 5 degree advancer
-V+H competition race pipe

This will make a very reliable hot rod without compromising streetability.



Good Luck, Ed
1983 GS750ED
2005 GSF1200SZ

 

[Guest]

I suppose none of the above will work on a 78-750 2v motor?

 

[oldschoolGS]

No, totally different animal.

Principle still applies:

carbs
cams
compression
ignition
exhaust

 

[Billy Ricks]

Actually the 1100/1150 sprockets are different, at least on the '83 and up 700/750 engines. I bought a set of slotted sprockets from V&H once for 1100/1150 engines that I had to return.

 

[oldschoolGS]

I know the cam chains are the same for GS1100 and GS750 16valve, I have used both GS1100 G2 and G15 cams in my 750 along with the GS1100 manual tensioner. I can't imagine the sprockets being different. Maybe some obscure difference though.

I had stock sprockets slotted on both sets of cams.

 

[Macmatic]

I know the cam chains are the same for GS1100 and GS750 16valve, I have used both GS1100 G2 and G15 cams in my 750 along with the GS1100 manual tensioner. I can't imagine the sprockets being different. Maybe some obscure difference though.

I had stock sprockets slotted on both sets of cams.

Do you know what those G2 cams run and do they need to be installed in pairs?

/\/\ac

 

[oldschoolGS]

I just talked to the folks at CamMotion (225) 926-6110 about cams for my Bandit 1200, they run about $300 a set. These are new cores and I would go with aftermarket springs and tensioner. You also need to get your stock sprockets slotted so you can degree them in.

Several others here also use the G2's (.330 lift@246)- they are good drop-ins.

Good Luck, Ed.
1983 GS750ED
2005 GSF1200SZ

 

[Billy Ricks]

I can't imagine the sprockets being different. Maybe some obscure difference though.

From what I recall, it's been about 10 years, they had a different tooth count.