The weather has finally turned, the Multistrada is out of the shed, and there is now room for working on the 1981 Suzuki GS650L. The engine has been ready to go back in the frame for a couple of months and now is the time.
To take the engine out of the frame, I did most of the engine tear down when it was still in the frame and ended up with all of the components in the basement to re-build the engine over the winter. Turns out that the engine is quite a bit heavier when it is fully assembled. Getting the engine from the basement to the shed was a bit of a challenge.
The manual’s method for removing/installing the engine to the frame is to lay the engine on its side and drop the frame over it. Seems like a way to cause more issues so I attempted to setup a system to slide the engine into the upright frame.
A similar idea worked well to remove the engine, but the top end of the engine was already removed. Now, even with only 1/2″ plywood as the support, the engine was just a bit too tall.
With the removal of the breather cover and some back and forth with the engine, the engine was able to drop into the frame.
I know I struggled a bit the first time around trying to get the carburetors back in between the engine and airbox, but the steps I learned the previous time made it much easier this time. Having the engine not fully bolted in may have helped a bit too.
Now, everything but the exhaust system is reinstalled and I was able to take a preliminary step to determine if my efforts have been worthwhile. Even though the engine has not run for a while and a compression test should be run on a warm engine, I couldn’t wait to see how things were looking after the replacement of the bent valve in the No. 3 cylinder.
The cold compression results cranking with the throttle fully open were:
- Number 1 Cylinder – 150 PSI
- Number 2 Cylinder – 135 PSI
- Number 3 Cylinder – 145 PSI (was 100 PSI warm before the re-build)
- Number 4 Cylinder – 150 PSI
These numbers are very respectable for a cold engine and I suspect will improve once the engine is running and the carburetors are synchronized again.