Small Amount of Fuel or Oil in Airbox By lileria (Read 1,909 times)

[lileria]

Hi, everyone. I'm repairing my 150cc Velocity scooter, and while checking several parts, I opened the airbox cover to find that the bottom of the air filter was a bit wet with what looked like gas or oil, I couldn't tell. There was a small amount of this fluid that collected on the bottom of the airbox itself.

Is having a small amount of fuel or oil in the airbox (and the air filter) a normal thing to happen, or does it signify a problem? I've been having trouble with the scooter not idling, and shutting off when throttle is applied. I've also had the ends of the fuel lines that are connected to the petcock leaking as if they don't have proper seals.

Any help with this is much appreciated. Thanks!

[Alleyoop]

The liquid in the air box is probably due to hard starts, cranking and cranking it get it started. But check if it is OIL or GAS, if oil then I would suspect the VALVE COVER VENT connected to the air box and is squirting oil through the hose into the airbox.

The FIRST THING you want to do before adjusting anything is ADJUST BOTH VALVES .004 inchs. After that if still some issues then that is when you need to adjust the CARBS fuel ratio mixture.

Also take the AIR FILTER OUT and wash it wish dish soap and let it dry and clean out the air box.

If you can get some pictures from the top looking down to see how everything is connected also the hoses going to the AIRBOX.

Oh almost forgot the leaking hoses, what you want to do is pull them off CUT abaout 1/2 off the hose to get to good solid part of the hose. They do stretch and wear on the part that fits over the connectors.
Alleyoop

[lileria]

Thanks for your reply! I believe that the liquid is oil, I touched it and it had an oily consistency. However, the inside of the air filter's tube has a smell that is as strong as gas but it's a little away from normal gas smell.

I don't currently have the tools to adjust the valves, is this step absolutely necessary before finding out what the problem is?

I'm going to see about taking some photos of the inside once I've finished cleaning the carburetor. I'll update as soon as possible. Thank you!

[Alleyoop]

We could see if it will run and start good without adjusting the valves. SO work on cleaning out the air filter and some picture of the carb area and hoses also any hoses going to the air box.

[lileria]

Quick update. I just got done cleaning the carburetor. I haven't connected it to the scooter yet.



That's my air filter type. Is it safe to use dish soap with this kind of air filter? Do I soak the whole thing in a bucket of soapy water, or just dip the black ends (which have oil on them)?

[Alleyoop]

That air filter is a paper filter so you cannot wash it just shake any dirt out if it gets really bad then you need to buy a new one.

Did you take the jets out and make sure they are clean and you can see through them? Also did you spray into the PILOTS jet passage and make sure spray came out the tiny PILOT jets outlets by the butterfly?

If not do that before putting it back on.
Alleyoop

scooterdoc.proboards.com/thread/12495/clean-carb-jets-passages

[lileria]

Yes, the main jet was completely clear on the main hole and the side holes. The pilot jet was completely plugged, but I managed to clear it with carb cleaner. The sides were also clear. I also used carb cleaner on most of the orifices of the carburetor itself, the spray seemed to clear the spaces.

[Alleyoop]

The tiny holes by the butterfly must be clear if you sprayed into the Pilot Jets Passage and spray came out of the tiny holes then your good but if not then you must clear them clearing just the Pilot jet is not good enough.

THIS IS USUALLY THE PROBLEM THE PILOT JET AND THE TINY PILOT JET FUEL OUTLETS BY THE BUTTERFLY.

[lileria]

Ok, after re-cleaning the carburetor, all holes appear to have the carb cleaner going through them. I discovered that near the top end of the line that comes from the intake manifold had a small tear in it. I taped it up, and started the scooter and it was able to start and idle. I took it around the block a few times, and everything seems to work perfectly now!

One thing I noticed was the gas gauge wasn't working. There is sufficient gas in the tank, but it didn't seem to gauge it. Also the speedometer wasn't working; on the kickstand, I gave it gas and the back wheel turned but the speedometer didn't gauge it. However, while riding it, it seemed to begin to work. Could something be loose? Thanks!

[Alleyoop]

The Speedometer is connected to the front wheel SO ONLY WHEN the front wheel turns does the speedometer work.
On the Fuel Gauge when did it work? How long has the scooter been broke and or not working?
If the scoot has been sitting not working for months or years most likely the float has disintegrated and you might need a new float sensor system.

[lileria]

Oh, that makes sense. I suppose the speedometer is working fine then. Also, the gas gauge seems to be working now somehow. All gauges seem to be working properly now!

I'm able to start the scooter, but one thing I realized was that it doesn't actually start correctly with the electric starter. It tried to start, but won't. I apparently have to use the kickstart three or four times, go to the electric start, then it'll catch. Other than that, when it does start, everything seems to be functioning properly.

Note: This scooter (unless I've been doing it wrong all this time) has never actually started solely with the kickstart.

[Alleyoop]

The scooters should start on 1 or 2 short hits with the electric start IF they are hard to start means something is out of adjustment is all.
Start it up and let it idle and then adjust the crabs fuel mixture, follow this procedure below:
Alleyoop

PRINT IT OUT AND FOLLOW the STEP BY SETP PROCEDURE.

scooterdoc.proboards.com/thread/1499/4ts-carb-tuning

[lileria]

Ok, I was going to begin this procedure today, and after starting, it warmed up for about 30 seconds before shutting off. Now it won't turn on and stay on without giving it throttle.

I checked the insides after this and noticed after removing the vacuum line that connects to the petcock, that there were drops of fuel coming out of it!

[Alleyoop]

If the Vacuum line from the PETCOCK has gas that means the PETCOCK is bad and gas is being sucked out from the vacuum line and flooding the motor with to much gas. That is why you have to give it throttle to keep it running needs lot more air to match with to much fuel.

So get a new petcock.
Alleyoop

[lileria]

Ok, I checked the petcock after your reply, and managed to do the vacuum test on it with a new clear line. Gas did flow through the fuel line and into a container I placed the line into, but no gas (or moisture) appeared in this new clear vacuum line. Why isn't it leaking now? Is this normal? Thanks!