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Suggested Engine Mods for 79 1000S

  • Thread starter Thread starter IGR
  • Start date Start date
I

IGR

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I'm lucky enough to have a spare motor (without carbs) for my '79 GS1000S. I'm thinking about rebuilding the spare motor with a few performance boosting modifications.

I'm not after a full-blown race engine and I still want to be able to tour comfortably on the bike but would be interested in hearing what modifications others have found successful.

Thanks
Ian
 
G'day mate .
Welcome to the font .
The only mod I did to my '79 'S was to put a 1085 Wiseco kit in it . Refurbished the head and that's it .
It's a different bike now . Reliable , grunt plus and still bullet proof .
Have fun .

Cheers , Simon .
 
I got a wiseco 1085cc kit ,a new set of Gs1100g cams ,which give it a good shove the Gs
needed ,as i use it two up alot, i also raised gearing from 15/42 to 16/41 and it pulls that
very easerly aswell....
when i had it Dynoed last it gave 68ftlbs of torgue and 95Bhp.....
big improvement over stock figures...
 
gshub said:
I got a wiseco 1085cc kit ,a new set of Gs1100g cams ,which give it a good shove the Gs
needed ,as i use it two up alot, i also raised gearing from 15/42 to 16/41 and it pulls that
very easerly aswell....
when i had it Dynoed last it gave 68ftlbs of torgue and 95Bhp.....
big improvement over stock figures...
Click to expand...

I've read before where the 1100G cams are more aggressive but have never seen the specs. Anyone have a factory service manual and care to share the lift and duration numbers?
 
My GS1000 crank was found to be twisted when I started my top end project. It is now welded (after true and index).
If yours is ok, not sure if you need to consider that for your application. I'm sure others with more history with this engine will let us know.
 
from wot i was told my Gs1100g cams have more overlap tha stock ones,they also had slotted Ape sproxs fitted to help degree them in properly, with a new camchain...
my stock cams were badly worn...
also my crank was checked and welded as they can spin.......
 
Thanks everyone. Weisco 1085 kit and GS1100g cams it is (I wonder if they are still available as OEM parts).

Next time I need chains and sprockets I'll look at going from stock ratios to 16/41 too. BTW are most of you downsizing the chain from 630 to 525 (or something like that)?

Ian
 
I got my wiseco 1085 kit imported to Uk from APE racing within 7 days ...
the Gs1100g cams the engine builder had in store simple........
when i can afford it i will get a set of smoothbore carbs.....
 
Is there a big advantage using the Wiseco set up over installing a1100G top end including the cams and D shaped ports?
 
Nessism said:
I've read before where the 1100G cams are more aggressive but have never seen the specs. Anyone have a factory service manual and care to share the lift and duration numbers?
Click to expand...

I asked Ray from Suziparts http://www.suziparts.com.au/ if he could give me a price on some GS1100G cams, explaining what I was trying to achieve. His reply was interesting. He said:

"...the cams for the GS1000 & GS1100 are the same!!"

Anyone have a definitive answer to Nessim's question? Perhaps there are different cams for various GS1100G models?

Ian
 
IGR said:
I asked Ray from Suziparts http://www.suziparts.com.au/ if he could give me a price on some GS1100G cams, explaining what I was trying to achieve. His reply was interesting. He said:

"...the cams for the GS1000 & GS1100 are the same!!"

Anyone have a definitive answer to Nessim's question? Perhaps there are different cams for various GS1100G models?

Ian
Click to expand...

I think proberly they are in some countrys ,all i know is mine goes rather well on the road and two up aswell Grin.....
 
gs850 gs1000 gs1000g and gs1100g it appears all are the same use part numbers 12711-49000 and 12721-49000 these supecede to end in 49001 on later parts data but its a supeceded number not a different part inlet cam is still avail oz
 
i would say a port job, and webcams and springs kit, this alone will make it a different bike,and if you wanted to blow more money, you could go with the wiseco kit, the cams and better flow will do most of the impressive work, also a good exhaust pipe so it can breath even better
 
Last winter I did a wiseco 1085 kit with wed cam and springs. Degreed the cam and all I can say is Hang on. I still need to rejet, I think it needs to be richer. and I'm using stock airbox and K&N filter. Money well spent.:lol:
 
850 Combat said:
Is there a big advantage using the Wiseco set up over installing a1100G top end including the cams and D shaped ports?
Click to expand...

Besides 11 cc's, you get the extra hp that goes with the compression ratio increase.
But for the cost difference, not much IMHO.

Daniel
 
bigger cam will give more compression as well, i dont think the piston kit would be as good as the cams , and it will make your cyl walls thinner
 
7981GS said:
Besides 11 cc's, you get the extra hp that goes with the compression ratio increase.
But for the cost difference, not much IMHO.

Daniel
Click to expand...
The GS1100G pistons are 72mm. With the 1100 stroke of 66mm it yields a 1075cc displacement. Those same pistons with the GS1000 stroke of 64.8mm only yields a 1055cc displacement. So the 1085 kit is actually 30cc bigger.
 
850 Combat said:
Is there a big advantage using the Wiseco set up over installing a1100G top end including the cams and D shaped ports?
Click to expand...

Compression rating. I think most of those wiseco kits are 10.5:1?
Cams won't increase compression like Dar said. But degree-Ing them evenly can "trick" it into acting like it has more.
Dollar for dollar, before I spent any money on pistons, I'd do the head. BB kits and larger diameter carbs are great, but if the head doesn't breathe any better, what's the point? Just my opinion though.
 
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