Posted by Old Roy on April 02, 2009 at 20:21:41 from (98.17.215.4):
In Reply to: C makes wierd noise posted by Lanse on April 02, 2009 at 17:19:18:
Gonna have to go with the stuck valve.
you can see the vapors shooting back out the carb as it pops.
So far I have only seen you add water as you were saying you didn't want to waste the money because you knowingly had leaks. At the same time I don't understand the "sweet smell" from the exhaust.
as you take the plugs out water should show on plug ,but seems to run fairly smooth not like a true missfire.
If you think it may be a piece of carbon stuck in the valve seat, give it a drink of water.
I've done this by warming engine to operating temp. speed up engine to working RPM and spray water with a spray bottle directly into carb.
Not so much as to stall the engine let it pick up speed and spray again and repeat till you use about a cup of water the steam it makes should soften the carbon and flush it out.
As you do this engine should smooth out.
You will see a lot of white smoke as you do this, but its only steam.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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