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I have an 81 gs850gx. I need to bore the cylinder some and find bigger pistons. I found a set for an 1100, but I don't know the diameter of that model. I know that the 1000G is 1 mm over the 850, but have no info on the 1100. Also, if I can fit them, is there anything else i need to change like connecting rods or different cam chain?
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Hopefully the pistons are from a shaft drive bike for the two valve. Most 1100s are four valves per cylinder.1983 GS 1100E w/ 1230 kit, .340 lift Web Cams, Ape heavy duty valve springs, 83 1100 head with 1.5mm oversized SS intake valves, 1150 crank, Vance and Hines 1150 SuperHub, Star Racing high volume oil pump gears, 36mm carebs Dynojet stage 3 jet kit, Posplayr's SSPB, Progressive rear shocks and fork springs, Dyna 2000, Dynatek green coils and Vance & Hines 4-1 exhaust.
1985 GS1150ES stock with 85 Red E bodywork.
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You would be better off looking for a second hand barrel for the 850 than looking for bigger pistons. All the 16 valve motor pistons won't work in your bike with 8 valves so discount that as an idea.
Suzuki madComment
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Ok. Thank you.Comment
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Don't know about if the pistons would "fit", but increasing the displacement by appx. 25% just by a larger dia. piston doesn't seem reasonable. Wouldn't be enough meat left in the barrels. Just my opinion!!1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100Comment
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Much of the 1100 increased CC's is due to a longer crankshaft stroke Not just the overboreComment
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You can bore the stock sleeves 3 mm bigger than stock bore. I hope this helps. Just KNOW that when you go to pistons from a different size engine you need to check compression height (from the center of the pin to the top of the piston at the squish band) because if it is higher or lower it will determine if you can use it or not. Ray.Comment
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