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Hi Eric, I have a 2 cycle engine with carb flooding. It is driving me crazy, since I have thoroughly disassembled and clean it several times. The float and float value are in very good condition. No holes in the float and no tears on the float value-float and float value work freely. Still the carb floods. Do you have any suggestions on how I can find and solve my problem? Thanks for your help. Dave
Answer -
Does the inlet needle have a rubber/viton tip on the end of it?
Do you a pressure tester? This tool will help you located the leak.
Let me know.
Eric
Thanks Eric, yes the needle valve does have a rubber tip on it which is in very good if not perfect condition. The other end has a small spring loaded tip that works fine. Here is two possible parts of the mystery. I think my problem really statred when I clean out all lines with carb cleaner, fine wire and air pressure. Could there have been something in the intake line that should have been there and I blew or forced out?
The second thing, I had to adapt another gas tank to the cycle (old one rusted, my goof); could the tank outlet being a couple inches higher be a cause? What I am thinking is that this would create higher pressure on the gas line to the carb.
I have not pressured tested the carb and am not aware how to do that. I thought about testing the carb offline to be certain of the inlet needle operation. Please tell me how to pressure treat it.
The reason I have not given up on this carb is that it was working before I "worked" on it and because I cannot find another one nor parts.
Assuming I can't figure this out, do you know of a carb fix it business?
I really appreciate your advice/help. Dave
Answer -
What brand of carb do you have? You should be able to find parts for it.
They sell small hand pumps to pressure test carbs to isolate leaks. Mity Vac vacuum pumps usually can be converted to a pressure pump. The carb should hold about 5-6 psi without leaking.
I doubt the tank is the problem...we've replaced several tanks and never had a problem.
Once in a while, on some carbs, the inlet needle seat will pit and cause leaking.
Let me know what brand carb you have.
Eric
Thanks Again, my cerb is a Keihin (Japan) 13/18mm to engin2 32mm post to post center and 25/32mm to air filter. Also, I have pictures of the carb and carb parts.
Your right the tank height is not a problem.
Where would you get a pressure tester? I am trying to find a Keuhin rebuild shop in case I have not figured this out.
Thanks again for your expert helphelp.
Dave
Answer -
Walbro, Stilh and several other small engine manufactures make carb pressure tools. You can order them but usually they are farily expensive.
I would check at an auto parts store for a Mity Vac vacuum gauge that can be used as a pressure tester.
Have you tried a motorcycle parts supplier...Keihin are more popular with motorcycles. Many of the carb parts are interchangable or one part will fit many different carb models. It's quite possible the inlet needle fits many carbs. I know Wal-bro, Zama and Tilliston carbs only have about 3 different inlet needles to choose from. You can even get generac bulk parts from some companies.
Let me know if this helps.
Eric
Thanks Again Eric, you have given me some ideas to follow up on. In the mean time, I don't think it is the inlet needle valve since it seems to pass the breath test and the bowl doesn't overflow while sitting.
However, I am really stumped on this one. I have cleaned the carb several times, even limited how much gas is in the bowl but when I put it on the engine it runs for about 30 seconds and floods out-gas comes out from the exhast gasket and plug is wet. Could the carb be leaking air around the bowl gasket and cause a flooding problem? Could the fire be too weak and not keeping up with gas intake? Could there be problem in the engine and not the carb? Sorry for taking all your time on this.
The only thing I can do next I guess is to look for used working carb ( this going to be hard sice it was made and kept in Japan ( the otlet to enging is 12/18 mm, look for a capatible carb, look for a rebuild kit, look for a refurb house or deep six the moped/scooter.
Can you tell I am frustrated?
Anyway, I do really appreciate your expert advice and help.
Dave
AnswerHow old is this engine and what is it on?
It could be compression, ignition or an air leak.
Is this the orginal carb? Did the problem, flooding, start all of a sudden or slowly happen over time?
Do you have a compression gauge?
Let me know.
Eric
