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Good big bore for running on the street?

  • Thread starter Thread starter Gs1100newb
  • Start date Start date
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Gs1100newb

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So my 1983 gs1100E with the stock welded crank and a welded clutch basket with a heavy backing plate, has some piston and cylinder scoring from the previous owner. She's burning oil.

I definitely need to replace the block and pistons, what's a good size bore to go with if I'm running this thing on the street? Is there a place that I could get a kit with pistons and a bored out block?
 
Contact member "Rapidray". He has a shop in California that builds big-block GSes. :encouragement:

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1170 is highest standard over bore that you can get with your crank and block. Probably as far as you want to go to avoid over heating as well. With 1150 crank and block you could go 1229cc. I'm also using straight cut gears and billet basket. Ray has been very helpful in giving me advice on going the 1229cc rout with an 89 GSX-r750 head and cams.
 
Gs1100newb said:
So my 1983 gs1100E with the stock welded crank and a welded clutch basket with a heavy backing plate, has some piston and cylinder scoring from the previous owner. She's burning oil.

I definitely need to replace the block and pistons, what's a good size bore to go with if I'm running this thing on the street? Is there a place that I could get a kit with pistons and a bored out block?
Click to expand...

I have a good standard bore 1150 block I can sell you if you're interested. Ive got the pistons too, but they use a bigger pin than your 1100 so they wont work. Also the 1150 will bore a little bigger than your 1100 (I think an 1150 block will bore to 1229) if you feel the need to do that.
I could meet you somewhere between Flower Mound and Plano if youre interested.
 
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If you get an 1150 block you can do a 1229 with a 3mm overbore. The same 3mm over bore on an 1100 only makes an 1166. I have a standing order with CP Pistons for a 1229 piston kit with 18mm wrist pins. Let me know if I can help.
Ray.
 
cdnoel said:
1170 is highest standard over bore that you can get with your crank and block. Probably as far as you want to go to avoid over heating as well. With 1150 crank and block you could go 1229cc. I'm also using straight cut gears and billet basket. Ray has been very helpful in giving me advice on going the 1229cc rout with an 89 GSX-r750 head and cams.
Click to expand...

APE has a 1260 kit that will fit a stock block, but you need to install new necked down sleeves. They also have a 1327 kit that requires new sleeves and case boring but I suspect it would run pretty hot on the street.
 
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