Big Bore 750 Kit into a stock 850

[Anonymous]

My 850 sat for years outside uncovered & untouched, I have it on the road now & runs good , Does not use any oil or smoke as of yet, I'd say maybe 800 miles since running again, Right after I got it running I had a local shop fine tune , they done a leak down test & said #4 was weak & may have to be gone into & rebuild parts are hard to find, Any one use a 750 Big bore kit in a 850 just for future reference if I do have to go into it

[focus frenzy]

Suzuki still carries everything you would need for a top end overhaul, some oversized pistons are not available anymore but you can use the next bigger size.

the problem with the 750-850 big bore kit is, if you have to bore the 850 over, the pistons wont fit, and I am not sure if the pistons will work anyway.

[SqDancerLynn1]

I would not worry about it yet. Run the bike at least 1k miles then recheck the compression, check the valves clearances too.

[lukehan]

parts available

I am in the middle of rebuilding a 79 gs850, I was able to get .50 over pistons direct from suzuki, check with your local dealer. They are kind of pricey, but I couldn't find them anywhere else.

Luke

[bwringer]

When I rebuilt my 850, I ordered OEM piston rings. After hanging up the phone, I thought it was horrible that Suzuki parts prices were so far out of line that the total was over $200. I mean, over $50 each for three slivers of metal? But I had to have 'em...

When I got the box after crying about parts prices for a week, I found that apparently the guy on the other end had heard "pistons, rings" instead of just "piston rings". He had sent a complete set of pistons AND rings.

DOH!

I think the pistons were about $43 each and the ring sets were another $9 or $10 each. Not too bad, really.