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GS 850 piston rings

Cool thank you looking forward to see what the prices also do I need a Base gasket or can I reuse what I have
 
You will definitely need a base gasket.

I might have that too, can't remember.
 
Among other things and in addition to the cylinder base gasket, don't forget the (4) cylinder base o-rings as well.
 
There may be confusion at the parts place (especially if you go to RideNow), the standard ring for the 1000 is the oversize ring for the 850. This confusion took so long to get straightened out at the RideNow House of Incompetent Ass Holes, by the time my rings got here for the 750/850 conversion the 1000 engine was already in the 750 and had been for weeks.

By the way, in case I haven't mentioned it lately, RideNow sucks.
 
mvalenti said:
So I'll need a head gasket base gasket and o rings as the base gaskets copper
Click to expand...


You'll also need a shop manual.

No, the base gasket isn't copper.


Starting at the top, you'll need:

- You'll probably need a breather cover gasket and a valve cover gasket (unless these have been replaced very recently during a valve clearance check).

- Valve stem seals

- The four copper sealing washers on the outside corner studs.

- Head gasket

- New piston pin circlips - do NOT re-use the old ones.

- Base gasket

- Base gasket o-rings -- these are the pear-shaped o-rings surrounding the rear outer studs.

- Cylinder sleeve o-rings -- these are the large, skinny o-rings that surround each cylinder sleeve.




While you're in the area, you'll also want to replace:

- carb boot o-rings, even if you recently replaced these. (and carb boots if needed)

- Seals, o-rings, and gasket in cam chain tensioner if you haven't already done this

- Seals in tach drive fitting if they're not recent.



Seriously consider replacing:

- Hard rubber cushions holding the cam chain idler pulley. Believe it or not, they're not supposed to be glass-hard.

- Rear and front cam chain guide blades if they're showing ANY wear or cracking

- The two 6mm bolts at the sides and the one in the front of the cylinder head. These are always corroded to hell and they're cheap.

- Cylinder head nuts -- same.

- Inspect the studs, and replace any with damaged threads.
 
mvalenti said:
Conversion??? 1000 head on an850???
Click to expand...

No, 1000 engine in an 850 frame.

The 850, 1000, and 1100 shaftie engines are all interchangeable. You also need the carbs, airbox, and driveshaft, and ignition from the donor bike, but the mounting points on the frames are all the same.

The 750/850 conversion refers to putting a 1979 (VM carbs) 850 block, pistons, and cylinder head onto a chain drive 750 engine. You have to grind the cases a bit, IIRC.
 
Last edited:
Thanks for the boatload of info. I have the head gasket, recently replaced the valve cover gasket and half moons as well as the orings on the intake manifold, have a bag of 25 so ill replace em again... I have downloaded the shop manual. whats the break in after rebuild? im not a redliner, but just curious. Hopefully with the ring job and shims ill see some more power, well noticable....
 
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