WilliamT

My GMS 47 is not running like it used to!
The problem may hark back to the last time I took it apart and cleaned it - I didn't take a note of the alignment of the cylinder liner before I removed it (silly me!!).
Can anybody please help with the correct alignment?

There is an indentation on the top edge of the cylinder liner - should that be directly to the front of the engine?
Failing that, how can I tell if the liner is correctly located?

Thanks,
WilliamT

rsieminski

The exhaust port is the tallest of the ports, line it up and you're back in business. It actually is made up of 2 holes, but it's closest to the top.

Flypaper 2

Indent goes to the front. Also the ex port is the highest port on the cyl.

Rudeboy

You really can't miss... if the liner is inserted wrong, you can't miss that... The holes (ports) in the cilinder liner have to match with the ports in the outer body of the engine...

Flypaper 2

Sorry rsiemenski. I must have been typing while you were sending.

Ernie Misner

Hmmm, if you have ran the engine with the liner in the incorrect position, you may have caused unnatural wear patterns in the piston and liner now. That once known great power might be a thing of the past. You are conducting an "accelerated wear test here".....:-)

On the other hand, I can't imagine the engine even running if the liner were rotated too far out of sync.

Ernie

WilliamT

Thanks to all for your help.
I did have the notch to the front. It all seemed OK but I just wanted to be certain.

Must be something else causing the engine to surge and die when raised vertical, and also won't hold a slow idle without cutting out.
Is mounted inverted, after 12 months upright in another plane, so maybe I just haven't got the tuning correct for inverted?

Thanks again,
WilliamT