#1 not friring


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biker art
Posts: 18
Joined: Tue Aug 01, 2017 6:31 pm
Location: Grants Pass,Or.
Motorcycle: 1975 Gold Wing

#1 not friring

Post by biker art » Mon Oct 16, 2017 9:28 pm



Been having problems with my carbs on my 75 wing. The engine runs but due to coil problems and carb problems I'm not getting it to run even enough to tune it. First was the coils, previous owner had them wired up wrong.an after weeks of messing with it I finally found the problem an fixed it. Now it's the darn carbs. Last week all cyl. were firing but I had linkage problems and removed the carbs just to work on the linkage and now #1 won't fire. Today I had the carbs out a few times to find out what was wrong. Everything in the #1 carb is looking good. What is the purpose of that vacuum valve on top of the #1 carb? I checked it out and everything seems clean and the jets are all clean as is the air passages inside the carbs. I'm lost here.



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dingdong
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1993 gl1500
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Re: #1 not friring

Post by dingdong » Tue Oct 17, 2017 6:51 am

That is the air cutoff valve. It prevents back firing during hard decel. Enrichens the mixture at decel.
Tom

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badandy
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Motorcycle: 1977 GL1000 Goldwing
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Re: #1 not friring

Post by badandy » Wed Oct 18, 2017 8:07 am

Some of the items that will restrict fuel are float adjustment or float hanging up in the bowl , clogged jets, clogged fuel strainer in the carb (under the needle valve) and stuck needle valve . Float adjusted too low will starve the jets. The idle jet on these carbs is extremely small. Any little bit of anything will clog them. They can visually appear clean, but you must blow air or run a very thin wire through them. I've been there a few times rebuilding mine.

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biker art
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Location: Grants Pass,Or.
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Re: #1 not friring

Post by biker art » Wed Oct 18, 2017 1:19 pm

Thanks guys. I've had the carbs off several times and checked the float level and had all the jets out and they are all clean and did use compressed air to blow out all the passages. That's why I'm going crazy with this. The coils are sending spark . This is a PITA.

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Maz
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1976 CB500T
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Re: #1 not friring

Post by Maz » Wed Oct 18, 2017 3:05 pm

You need to establish what's missing. Is fuel definitely getting into #1 cylinder? Is the spark plug on #1 definitely sparking under compression? Has #1 got the same compression as the other 3?
Assuming you have fuel/air in the correct ratio, spark (at the correct time) and compression, it will fire.
Maz
Nostalgia is not what it used to be!

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biker art
Posts: 18
Joined: Tue Aug 01, 2017 6:31 pm
Location: Grants Pass,Or.
Motorcycle: 1975 Gold Wing

Re: #1 not friring

Post by biker art » Wed Oct 18, 2017 6:39 pm

Pretty sure it's fuel. Have some more checking to do.



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