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gs750/gixer cam swap

  • Thread starter Thread starter Mark Harrop
  • Start date Start date
specs

specs

Well, I have learned that the cam sprockets are different on the short stroke motors. The crankshaft sprocket and the cam sprocket must match. 85,6,7 cams wont work in the 88-89 models. Where the air cooled 16v motors fall into this I havent figured out yet. Anybody know if the 6 speed early gixxer trans will fit the air cooled 16v case? My tranny just arrived, but I just had surgery and cant do much with one arm. I can't wait to get these motors torn down so I can make a plan.
 
Well, I have learned that the cam sprockets are different on the short stroke motors. The crankshaft sprocket and the cam sprocket must match. 85,6,7 cams wont work in the 88-89 models.
Click to expand...
Just use the cam sprockets from the original motor - not the donor. Unless of course, they physically will not fit the bolt pattern.
 
All cams for GS, GSX, GSXR 16V engines will fit the GS 16V engine, note -GSXR to 90. The shim-model ones do not fit as I have been told. A friend of mine uses Cammotion G21 intended for the GSXR in his -83 GS1100, riuns like crazy. With 1135 cc Wiseco, ported head with 28,5mm intakes, VH 4-1 and Mikuni Smooths 33mm it power wheelies on second gear even though he uses a 41 rear sprocket instead of 42.....

My ?bike has a 1168cc JE kit with the same type of head except my exhaust valves are 24,5mm instead of 23mm originals, RS 36 carbs and a VH exhaust. My bike almost power wheelies but not like his does.
So it?s of interest to me to find out about the 750R -89 cams, I think they are somewhere in between my stock cams and his G21:s. They lift 0,38" and has a duration of 244degrees @0,050. High lift but not that long duration.
 
I'm going to ressurect this thread.. I see that they are talking about the gs 750 which has less aggressive cams as the 700, so I would assume that it would make a larger difference on that bike. Anyway.. I have seen early gsxr cams go for cheap on ebay, so I think these may be an cheap upgrade, if they just drop in anyway. I am not looking to replace springs or anything besides the cams themselve. I have no knowledge on the subject of cams, so your help is appreciated.

one of my questions is if anyone knows the specs of the 700 cams

Oldschool GS said that
".330 lift @ 246 duration is about the limit for drop-ins"

Does anyone have the specs for the early gsxr cams 750 and 1100's are the sprockets the same size and or slotted? I would try to research more but i'm at school now and they block most sites...

Does anyone have experiance doing something like this? would I want to put just an intake or exhaust cam in? Any down sides?

I would really not consider this if it's going to requre a large chunk of change (like everyone right?), so crush my dreams now if this is not going to be feasable.

Nick
 
Why not move it on a bit more & look at using a complete gsxr750 head (flows more than any of the older gs /gsx heads as stock) Also still has the capacity for tuning without getting fragile

Not done it myself so dont know whats involved but have seen one on a 1135 running & producing good power the owner was expecting good reliability as well both on the street & strip
 
That would be another option I was thinking about doing as well. I really just want a bolt in power adder without too much hassle. I do also like the look of the gs head on the bike, and would like to keep it as stock looking as possible. I have heard of people putting the gsx-r heads on but i thought it required more work than just bolting it in and putting the chain on.

Are the springs on a gsxr head stiffer, and would they fit on the gs head?
 
Slingshot '88-'89 Gixxer cams are :

intake .355 @ 248 (at .040)
exhaust .334 @ 242 (at .040)

the 86 and 90 cams have less lift if I'm reading correctly
 
'88 and '89 were the short stroke motors. In '90 they lengthened the stroke. Do you have the specs for the '86 and '87 cams?

I believe the set of V&H cams I havefor my bike have .343 lift and don't require guide mods but a spring kit and either new or hardened rockers are recommended.
 
So that means I would be limited to the 86-87 cams, unless they are the same as the 87-88 cams, in which case they would not be drop in..
 
Mark Harrop said:
Anybody know the cam specs on some 89 Kat 750 cams? These may be more suited to the air cooled GS 750 16v. I have the flatslides too. Somehow I think that they are very close to the GS cams. With my bottom end making the death rattle....its decision time. Rebuild the GS, or rebuild the Gixxer motor :roll: My wife is gonna kill me either way.
Mark
Click to expand...

Hey Mark,

I bought a set of used gsxr cams off a poster here. I was told they bolt right in. This is what I saw when they arrived.

The cams are single journal not dble like the gs. some of the cam casting would need to be machined away as to not destroy the other side of the journal not being used. they are also shorter than the gs cams.

The cams only came to the edge of the outer oil holes. the ones in the middle of the outer gournals. I am not convinced the outer cam journal will be adaquately oiled as oil would be spraying out the end of the cam.

I couldn't put them in with any confidence of reliability. I shipped them back to our gsr brother who saw fit to keep my money anyway.
 
katman said:
Hey Mark,

I bought a set of used gsxr cams off a poster here. I was told they bolt right in. This is what I saw when they arrived.

The cams are single journal not dble like the gs. some of the cam casting would need to be machined away as to not destroy the other side of the journal not being used. they are also shorter than the gs cams.

The cams only came to the edge of the outer oil holes. the ones in the middle of the outer gournals. I am not convinced the outer cam journal will be adaquately oiled as oil would be spraying out the end of the cam.

I couldn't put them in with any confidence of reliability. I shipped them back to our gsr brother who saw fit to keep my money anyway.
Click to expand...

Yeah, the installs I've seen pictured (never in real life) made it pretty clear that although the performance increase is apparently significant, they won't work for a road bike. Some drag racers use that set up because, well, they don't care so much about reliability.

As much as I hate to stir the pot, I wonder if perhaps the GSR community wouldn't benefit from more of the details regarding your deal gone bad. Might save someone else here some money. Ignore me if it's already been played out here...
 
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