possible reed problem

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vettman

Seaman
Joined
Jul 11, 2001
Messages
57
Hey all; Have 2000 90 hp merc. 2-stroke. Carbs rebuilt 6 months ago , boat has been running fine. Other day smelled gas under motor cover and saw gas leaking out the front of lower carb, even with motor off. Took carb off and apart, nothing appeared out of the ordinary. Did a bench test to check the float operation by filling carb with gas and blowing as hard as i could thru the gas line hose, it held it's own . I assume float is ok. Put back on and gas still flowed out lower carb. Not so much at high idle, but at idle and continues after shut down. Is it a bad reed valve ? Thanks for any input
 
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Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
28,074
Re: possible reed problem

Very unlikely that is a reed valve problem. It is likely an inlet needle vavle and seat problem, a float problem or some combo.
 
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Chad N

Cadet
Joined
Jul 18, 2012
Messages
15
Re: possible reed problem

Check the condition of the needle valve and if there is any buildup of junk on the seat. If the valve is rubber the tip could have become worn or hardend which leaks. Double check the float height. Somewhere in there you should find the problem.
 
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vettman

Seaman
Joined
Jul 11, 2001
Messages
57
Re: possible reed problem

Chris1956 said:
Very unlikely that is a reed valve problem. It is likely an inlet needle vavle and seat problem, a float problem or some combo.
Click to expand...

Thanks Chris. I read where reed valves are mostly trouble free. But the carb is now on the bench with the bowl full of gas, no leaking out front or anywhere. Stupid question. Can a carb from above the bottom carb be leaking down since the gas lines all connect to each other causing the bottom one to leak out the front? The 90 has three carbs up and down. Thanks
 
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aussieflash

Lieutenant Junior Grade
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Feb 5, 2011
Messages
1,004
Re: possible reed problem

Check your float height and adjust it to spec.....sorry about the echo Chris.
 
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Dave1027

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May 25, 2010
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Re: possible reed problem

vettman said:
. Did a bench test to check the float operation by filling carb with gas and blowing as hard as i could thru the gas line hose, it held it's own . I assume float is ok. Put back on and gas still flowed out lower carb.
Click to expand...
I would not use mouth blowing. Better to use primer bulb to put fuel pressure on the carbs. You can even hook the gas line directly to each carb while you hold it in your hand and have somebody pump the bulb. You can fill each carb that way and drain them to find out how much gas is being let in. Maybe you have a leaking gasket in the carb?
 
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vettman

Seaman
Joined
Jul 11, 2001
Messages
57
Re: possible reed problem

OK. Thanks to the Pros who answered in regards to my problem. After taking carb off a couple of times , visuall inspection appeared nothing out of the ordinary, float seemed to operate properly during bench test. But still leaked out front when put back on. Back off again i decided to blow compressed air thru everything as last resort. Float level measured fine . 9/16 " by the book. Back on everything is fine , no leaking. My new question now is what was it. Carbs rebuilt 6 months ago, new inline filter ,new water seperator, stabill added to gas, boat being used. If there was junk somewhere, why just bottom carb trouble? Crap flows downhill !!!?? Appreciate past and future opinions Thanks again.
 
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