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Old 03-17-2019, 10:43 AM
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leesiel leesiel is offline
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Default Fuel out of exhaust

My buddies 420 (all stock never been opened) sat for about a year; when we went to restart it fuel was coming out of the exhaust.
We boiled the carb in lemon juice for about an hour and reassembled. Same issues still persisted so I removed valve cover and checked the valve lash (was good ) so then I disassembled the carb to double check that I put it together properly and everything looks normal.
Plug is soaking wet with fuel and starter fluid doesn't help.
Suggestions?
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Old 03-17-2019, 11:07 AM
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Needs a new needle and seat more than likely.
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Old 03-17-2019, 11:55 AM
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Old 03-17-2019, 12:03 PM
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How can I tell? I thought that initially also but a visual inspection didn't turn up anything obvious (is it possible to tell by just looking?)
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Old 03-17-2019, 09:02 PM
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I can tell you some of those needles have a rubber tip. You might have melted it off. Other than visual no not really.
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Old 03-17-2019, 10:12 PM
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Appreciate the quick advice and will order parts this week
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Old 03-18-2019, 11:14 AM
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The way I check them is to take the carb off and put a short piece of hose on the fuel inlet nipple and blow in it. The air should stop when you turn the carb upside down. If it doesn’t then you have a needle and seat problem.
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Old 03-19-2019, 08:04 AM
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Quote:
Originally Posted by Flyinhillbilly View Post
The way I check them is to take the carb off and put a short piece of hose on the fuel inlet nipple and blow in it. The air should stop when you turn the carb upside down. If it doesn’t then you have a needle and seat problem.
That's new to me I'll have to try that ! I did pull it apart again yesterday and the needle was not all the way clipped in so I pushed it back into position and tried to start it. Didnt notice fuel coming out of the exhaust, but now I get the occasional backfire and flame out of the exhaust.
I didn't try as hard yesterday to start it as I did on Sun. But i did spin it over quite a bit and it never tried to catch or even come close to starting (even with starter fluid ). I also noticed that the gasket between the carb and the airbox is gone so gonna order a gasket set and try again.
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Old 03-19-2019, 08:24 PM
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The spark plug is probably all carboned up and wet. Pull it out and clean it and pull over the engine a couple of times to dry the cylinder and get some oil back on the cylinder walls.

Denny
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