Does anyone know anybody that makes big bore kits for an 81 850g? Google has been a pain in my a$$ lately and refuses to bring up relevant search results. Thanks.
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I've never heard of a big bore kit for the 850's. Only the 750's and the 1000's. -
It's called buying a 1000G or 1100G engine, carbs, and airbox (I think you need the driveshaft, too), and installing them in an 850G/GL frame.1983 GS850G, Cosmos Blue.
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Please provide details. The GSR Hive Mind is nearly omniscient, but not yet clairvoyant.
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It's something I wondered about and it's a dead end, as I recall. 850 is the practical max for those barrels and that crank+cases. I don't think you can get a longer throw crank in those.
I'd be happy to be proved wrong though, as I have a '79 engine in bits and if a longer throw crank would go, I'd look seriously at it.Dave
'79 GS850GN '80 GS850GT
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You can go custom as I have done. 71mm bore leaves a 2mm sleeve thickness.
Really nice ride with extra CR too. Don't listen to the knockers.....it's worth doing.
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GS 850GN JE 894 10.5-1 pistons, Barnett Clutch, C-W 4-1, B-B MPD Ignition, Progressive suspension, Sport Demons. Sold
GS 850GT JE 1023 11-1 pistons. Sold
GS1150ES3 stock, V&H 4-1. Sold
GS1100GD, future resto project. Sold
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The 850 clutch is marginal stock. The 1000G had many upgraded internals. And as cheap as 1100G engines are, i don't think it's worth the hassle.Comment
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As an alternative to gain HP is there a reasonable way to increase compression on these engines? I ran my DRZ400 at 12:1 and it definitely upped the ponies a bit. Of course I had to run 91 octane to avoid pinging.Comment
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I agree with the 1000G/1100G motor. I have a 1980 1000G with a 1983 1100G motor, and its a pretty nice ride. Always something on tap when you want it.
Your frame is the same as mine.sigpic Too old, too many bikes, too many cars, too many things
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Back in the day... 870 and 920 kits were available for the 750/850 engines. Some, may still be out there.
Both Wiseco and J & E told me that they could simply replace the 18mm piston pins with 16mm piston pins in their 1000/1100 2-valve kits at no extra charge if someone wanted a larger kick-start GS.
Doesn't anyone know how to pick up a phone and call anyone these days?Comment
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