Fitting the GS 1000 tank with an 1135 engine

[John Kat]

Having fitted an 1135 ( rebored to 1230) engine in my 1100 Katana, I decided to do the same upgrade on a GS 1000.
It looked pretty simple as the carbs of the 1135 have the same outside dimensions as the OEM GS 1000 ET despite the increase of the throttle slide from 29 to 32 mm.
The first difficulty came from the bottom front left frame lug that has to be moved out for to fit the larger engine.
A pain as it's welded on the GS 1000...
The next difficulty is that the petrol tank will slighly touch the top of camshaft cover as the engine is slightly taller.
Here's a picture

 

[John Kat]

The solution is simple in theory as you only need to lift the tank.
In this case, I decided to lift the front of the tank by 10 mm.
To do so I drilled a hole above the normal tank support to insert an Allen bolt through the frame.
Next, I "tortured" the rubber support so that the original hole was augmented in one direction to take both the original support and the protuding bolt.
A bit of glue ensured it would stay put when installing the tank.

 

[John Kat]

And the final product:



I'll explain in another post how I did with a GSXR 1059 engine in a GS 1000 frame to solve the same issue.

 

[steve murdoch]

John, thanks for the how-to and the pics.

 

[John Kat]

My pleasure Steve!
By any chance if you bump into a throttle slide (32 mm in diameter) for a BS 36 SS carb please let me know .

 

[limeex2]

Thats a lot cleaner than my version. I made a new bracket for the rear mount point, which helped me with petcock clearance issues. Had to make a couple new motor mounts also. Sorry no pics. It's been a very long time.