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Old 07-19-2009, 07:08 PM   #11
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Re: how to kill a evolution

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The leak is NOT around the hole at the top buddy (yellow arrow) but where the red arrow is.

Down at the bottom of the the barrel (red arrow) where the barrel joins up to the top of the engine casing. (this is not your engine but shows what I mean).

Look at post #5 AND #6
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Old 07-19-2009, 10:17 PM   #12
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Re: how to kill a evolution

thanks for the info ill tell you if it works next week as that is when i am going to sudbury
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Old 07-20-2009, 11:18 AM   #13
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Re: how to kill a evolution

That engine is very low compression, and it does like to run on even a tiny bit of air. There should be a gasket between the carb & the body. There should also be oring inside.
The carb is held on by a 2 pc hex bolt, that has a curve. It acts like a clamp and can come lose. Check for all three things.

Its purposely kept low compression to make for easier starts,
hense the "trainer" part. Decent little engine, for 70 bucks, hard to beat, for its purpose.

See here for exploded picture:

PDF link on right side for exploded view.
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Old 07-20-2009, 02:19 PM   #14
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Re: how to kill a evolution

It can be leaking air anywhere in the crankcase.

It could be leaking air at the point where the carb meets the crankcase.

It could be leaking air around the place the the back-plate meets the crankcase.

when it leaks air, then you can completely close off the throttle and it will continue to idle as if the throttle is open a little (the size of the leak letting in the same air as a slightly open throttle, like idle)

I had an engine acting funny like that, and it was because one screw came loose from the back-plate.
With lots of practice, you can make it look easy.
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Old 07-20-2009, 03:05 PM   #15
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Re: how to kill a evolution

I read an article about a 46 size, might have been a GMS.
Anyways, , , the article went on to say that a common fault of no shut-down was because of a faulty front bearing, bearing housing, or even the crankshaft.
After many hours of running, the front end would allow air into the engine and would only stop if you pinched off the fuel line.

Try this:

- Get a rubber ballon and put the engine in it. Hot-dog ballon works good.
- Break a hole in the back of the ballon for the crank area to stick out just in front of the carb.
- Tie the balloon closed around the crank area.
- Now blow up the balloon a bit and immerse the engine in a cup of fuel.

Roll and jiggle the crank shaft.
Watch for any bubbles around the front end.
Any bubbles means air is getting in, which keeps the engine running.

Last edited by Mike Emilio; 07-20-2009 at 03:13 PM.
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