7
7981GS
Guest
The bike had 22,000 miles on that engine when the chain broke.
I added more clearance than what was recommended by Wiseco.
Daniel
I added more clearance than what was recommended by Wiseco.
Daniel
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G
gssuzukixxx
Guest
Just to wrap this up; I got an 850 cylinder block and pistons from a very generous forum member, and new rings and gasket set from Bike Bandit. I had to do the minor chiseling on the inside of the crankcase for the cylinders to go all the way down. I gave the head a bit of an overhaul by lapping the valve and putting in new seals.
Anyway I got it all together on Saturday and it fired right up. It is -11 C here and lots of ice and loose gravel on the road but I took it around the block anyway. Just about froze but I thought I imagined it having more power. Will have to wait till spring now to really test it out.
BTW I used GS850 cams.
Brian
Anyway I got it all together on Saturday and it fired right up. It is -11 C here and lots of ice and loose gravel on the road but I took it around the block anyway. Just about froze but I thought I imagined it having more power. Will have to wait till spring now to really test it out.
BTW I used GS850 cams.
Brian
M
maxfielding
Guest
850 Jugs on GS750
850 Jugs on GS750
Hi All,
I have a 1976 GS750 wire wheel and removed the head and cylinders to replace leaking gaskets, hone cylinders and lap valves. I am reassembling at the moment but noticed a mismatch between cylinder liners (72mm OD) and crankcase openings (78mm ID). As the cylinders are dowelled adequately to the crankcase they will position accurately but apart from the usual paper gasket at the joint there are four O ring seals around the liners. The O rings are approx. 2.5mm cross section and fit in their own grooves at the base of the cylinders but with the sizes above will not bear on anything and will do a poor job of preventing oil leaking up outside the liners.
My dilemma is whether to fit them as the shop manual suggests or leave them out in case they break and get into the oilways. The only explanation I can think of is that the crankcase is made to also take GS850 cylinders for commonality of parts between models. Any ideas please?
Cheers, Max
PS. The crankcase is stamped GS750 and the cylinders 748CC so they match and the bore is 65.5mm dia (first oversize).
850 Jugs on GS750
Hi All,
I have a 1976 GS750 wire wheel and removed the head and cylinders to replace leaking gaskets, hone cylinders and lap valves. I am reassembling at the moment but noticed a mismatch between cylinder liners (72mm OD) and crankcase openings (78mm ID). As the cylinders are dowelled adequately to the crankcase they will position accurately but apart from the usual paper gasket at the joint there are four O ring seals around the liners. The O rings are approx. 2.5mm cross section and fit in their own grooves at the base of the cylinders but with the sizes above will not bear on anything and will do a poor job of preventing oil leaking up outside the liners.
My dilemma is whether to fit them as the shop manual suggests or leave them out in case they break and get into the oilways. The only explanation I can think of is that the crankcase is made to also take GS850 cylinders for commonality of parts between models. Any ideas please?
Cheers, Max
PS. The crankcase is stamped GS750 and the cylinders 748CC so they match and the bore is 65.5mm dia (first oversize).
Last edited:
Steve
GS Whisperer
I doubt that they designed the 750 to accept the 850 upper end, as the 850 did not come out until three years after the 750.
If you are looking for a performance upgrade while you have your engine apart, the pistons and barrels and head from a '79 850 will bolt right on. You can use newer barrels, but will have to either use your stock head or get a set of CV carbs that will match the '80-and-up 850 head.
.
If you are looking for a performance upgrade while you have your engine apart, the pistons and barrels and head from a '79 850 will bolt right on. You can use newer barrels, but will have to either use your stock head or get a set of CV carbs that will match the '80-and-up 850 head.
.
M
maxfielding
Guest
It's an amazing coincidence the crankcase opening is perfect for the GS850 cylinders don't you agree Steve? The O rings would actually seal then. I will probably find 850 cylinders and pistons after I have closed it up! Thanks for the suggestion.
M
maxfielding
Guest
I saw a Suzuki GS850 disassembled today Steve and it has the same problem. The O rings are only held by the gasket with the crankcase openings irregularly shaped, and open between the cylinders, They would provide little or no support to the O rings.
I think I will just silicon them in the grooves and hope they stay there. My gasket is quality Japanese after market, not genuine, but will provide no support to the O rings as it is cut to the case opening.
Regards, Max
T
Thunderpipes
Guest
Hi,I also have a gs750 1977 with low compression on one cylinder. The valve clearances are good,so I presume that I have a burnt out exhaust valve or broken rings? The thought of installing gs850 barrel & pistons sounds like an exciting upgrade! Good luck and let us know how you get on.
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