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79 GS850 to 80 head swap

  • Thread starter Thread starter 86turbodsl
  • Start date Start date
8

86turbodsl

Guest
Swapping a 80+ head onto a 79 engine. What gaskets do I use?

80+ or 79-78 ?

Dear wife has graciously given me a rebuild as a Christmas gift. :)
 
Check the part numbers on the Alphasports web site for the 79 and 80 to confirm

The internal gaskets should be the same

The carb intakes are different

I just have to ask, why are you swapping heads?
 
All the gaskets are the same.

But the intakes, carbs, etc. are very different...
 
Big T said:
I just have to ask, why are you swapping heads?
Click to expand...

Unless he has some mechanical defect, the only advantage I could see is that he gets the larger intake ports of the CV-type carbs. :-k

All of the gaskets should be the same. They did not change until '82, when they added three bolts to the valve cover.
One other change for '82 was the clutch cover. There is a squarer back end on it where the hump was removed from where the kick starter used to be.

86turbodsl, are you also aware that the intake cams are different from '79 to '80?
The exhaust cam timing is the same, but the intake opens and closes 10 degrees earlier on the '80.

.
 
Thanks for the info guys.

To shed some light on the subject, I recieved the bike with a head that had a few broken studs. The quote to fix/remove the broken studs (EDM) was more than the cost of a replacement Ebay head and carbs in good shape.

So what gaskets do I need?

Base (cylinder is off)
Head
Valve
O rings
Anything else?

I think I only have the 79 cams. That should drop in though.
 
86turbodsl said:
So what gaskets do I need?

Base (cylinder is off)
Head
Valve
O rings
Anything else?
Click to expand...

Valve seals
Cam Chain tensioner gasket
Breather gasket
Exhaust gaskets

May as well just buy a full gasket set. Be cheaper and easier
 
Base O rings (okay, pear shaped)

Intake O rings

Cam chain guides as needed

Air box

Throttle cables (?)
 
Hmm. Wondered about throttle cables. Anyone know for sure?

The later carbs are in really good shape.
 
I have had the stock 26's, 34 CV's and 29 smoothbores on the same bike and never had to change the cables.
Does that answer your question?

Daniel
 
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