carb keeps flooding

typhoonboi · 04-09-2008, 12:00

i recently put a 125 carb on my 50 runner engine but everytime i stop lots an lots of petrol comes out of the overflow so much so tha i went to bed with half a tank and by the morning its completly empti ive re jetted it and checked the float but still no change if any one has any suggestions it would b highly apretiated cheers

SCOOTER GURU PR · 06-09-2008, 05:39

Quote:

Originally Posted by typhoonboi

i recently put a 125 carb on my 50 runner engine but everytime i stop lots an lots of petrol comes out of the overflow so much so tha i went to bed with half a tank and by the morning its completly empti ive re jetted it and checked the float but still no change if any one has any suggestions it would b highly apretiated cheers

my friend!!!! ill recomend to you to keep re-jetting the carb
and try using the smaller jets that you can find as a starting point...
other is to open the carb...take some carb cleaner and clean the hell out of it i mean every hole that u can see! every inch of it even if you empty the can...other can be that u have a small motor and that carb may be to big...but i doubt it....

Spidy · 11-09-2008, 13:39

Did you check the fuel hose? maybe it´s cut somewhere, put a new one. I guess it hasn´t to do with jetting or the bowl, because when the bike is sit and turned off, there's no vacuum or gas passing throw.

waxhead · 18-09-2008, 05:02

Using smaller jets is going to end in tears
Due to the fact there is less airflow in the carb than on a 125 and so less pressure drop across the jet
you will find it runs lean
Its more likely you will need a larger jet or at least the same size
Its a carb not a fuel injection system

Ok the flooding of fuel sounds liek a stuck float or a worn seat on the float valave
Check those and let us know

spectroplasm · 22-09-2008, 08:48

Hi, I recently had the same problem where when the bike is turned off the carburetor would flood immediately in small quantities then after a while it would literaly trinkle gas. I cleaned everything out and changed mainjets but it wouldn't resolve the problem one bit. It was later on that I figured out it was my petrol pump that was stuck, the vaccum itsn't operational and the gas would move freely inside the hose even if the engine wasn't turned on. I switch it with a new one and now everything is ok. Maybe you should check the petrol pump to see if it's working or not.

04-09-2008, 12:00	#1 (permalink)
typhoonboi Registered User	carb keeps flooding i recently put a 125 carb on my 50 runner engine but everytime i stop lots an lots of petrol comes out of the overflow so much so tha i went to bed with half a tank and by the morning its completly empti ive re jetted it and checked the float but still no change if any one has any suggestions it would b highly apretiated cheers

11-09-2008, 13:39	#3 (permalink)
Spidy Registered User	Did you check the fuel hose? maybe it´s cut somewhere, put a new one. I guess it hasn´t to do with jetting or the bowl, because when the bike is sit and turned off, there's no vacuum or gas passing throw. Last edited by Spidy; 11-09-2008 at 15:01.

18-09-2008, 05:02	#4 (permalink)
waxhead Registered User	Using smaller jets is going to end in tears Due to the fact there is less airflow in the carb than on a 125 and so less pressure drop across the jet you will find it runs lean Its more likely you will need a larger jet or at least the same size Its a carb not a fuel injection system Ok the flooding of fuel sounds liek a stuck float or a worn seat on the float valave Check those and let us know

22-09-2008, 08:48	#5 (permalink)
spectroplasm Registered User	Hi, I recently had the same problem where when the bike is turned off the carburetor would flood immediately in small quantities then after a while it would literaly trinkle gas. I cleaned everything out and changed mainjets but it wouldn't resolve the problem one bit. It was later on that I figured out it was my petrol pump that was stuck, the vaccum itsn't operational and the gas would move freely inside the hose even if the engine wasn't turned on. I switch it with a new one and now everything is ok. Maybe you should check the petrol pump to see if it's working or not.