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GS1000 with GS1100G top end

Decided to resolve the issue of what was exactly holding up the GS1100G cylinder on the GS1000 engine since my cylinders & Head should be back soon. I tore down my engine in 3 hours and spent some time measuring a 1979 GS1000E & 1983 GS1100G cylinder with a Mituoyo digital caliper, here is what I got:

GS1000E Cylinder Sleeve Outside Diameter
#1 76.43mm
#2 76.42mm
#3 76.46mm
#4 76.59mm
GS1000E Cylinder Spacing distance
1&2 18.67mm
2&3 43.63mm
3&4 18.48mm
GS1000 Cylinder Sleeve Depth from base Gasket Surface
#1 29.38mm
#4 29.39 mm

GS1100G Cylinder Sleeve Outside Diameter
#1 78.16mm
#2 78.13mm
#3 78.10mm
#4 78.05mm
GS1100G Cylinder Spacing distance
1&2 16.81mm
2&3 41.94mm
3&4 16.90mm
GS1100 Cylinder Sleeve Depth from base Gasket Surface
#1 29.22mm
#4 29.24 mm

I then install a extra 1100G cylinder (1074 cc) on my GS1000E engine case and it drops right on. I then rig the cam chain so it won't get caught and I proceed to rotate and rotate and rotate so more. Nothing moves, lifts or other. I look down the cylinders and the pork chops and crank gear clears everything. I rotate so more with same result.

The measurements show the cylinder depth is identical between the GS1000 & GS1100G so no issue with contacting the crank gear as previosuly stated. I will verify on Monday since my 1100 parts should be close to done

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Last edited:
Here is mine with Wiseco 73.5 pistons installed and .40" shaved off the cylinder. Looks like my measurements were close.

DSCN0039.jpg


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