GMS 40 Trials - RCCanada - Canada Radio Controlled Hobby Forum
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Old 11-13-2007, 10:24 AM   #1
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I am: Cliff S
Join Date: Feb 2007
Location: Belleville Ont.
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GMS 40 Trials

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I have been doing some work on that GMS .40 engine.
The original problem was that it would not hold a good high speed needle setting, it acted like it had a tuned pipe that was not suited for this engine and the engine would quit after two minutes.
I tried a different muffler with no success.
In order to disrupt the tuned pipe effect I shortened the barrel of the muffler from 3.5" to 1.625". The muffler is held together with a long bolt.
Now it would run about 6 minutes and quit, when I flipped it over when It stopped there was no compression.
The original carb had a bore of .332", I replaced it with a Perry carb for an Irvine engine with a bore of .290.
Now the engine would run until within an ounce of fuel left then quit and again it had no compression. The needle was set on the rich side of lean, the song remained constant and the amount of smoke was constant. there was no bubbles in the fuel line, again after about half an hour or so the compression seemed normal. Hey Andrew any comments?

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