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Post by bigmac on May 29, 2013 15:41:54 GMT -5
I started to have stalling issues while idling when I was going to a friend's house on Memorial Day. I first checked the spark plug to see if anything looked off, such as a lean or rich fuel mixture and found it a bit wet and oily looking (photo below). I took out the carburetor and found it wet and oily around the engine's intake manifold (photo below).   I'm not sure what to do. I read that this can happen when an engine is worn out or has a faulty ignition system. The scooter has little over 2,000 miles on it and has been taken care of, so I can't imagine the engine being in bad shape. Any suggestions? Thanks, |
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Post by jeffery5568 on May 29, 2013 16:16:17 GMT -5
I don't think its the engine plug would be way more oily.
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Post by bigmac on May 29, 2013 18:52:25 GMT -5
Yeah, it's not very oily, so it's probably something else. Also, from what I hear, engines don't usually stall if their spark plugs are getting oily.
A few hours after I took those photos the oily residue was dry. If it was really motor oil, I'd think it would still be wet to the touch. Now I'm thinking it could be from gas. I'll look over the carburetor. I have the carburetor jets soaking in carb cleaning fluid right now.
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Post by alleyoop on May 29, 2013 19:00:11 GMT -5
Check your Air Filter I bet it has oil on it or it is soaked with oil. It probably is from your VALVE COVER VENT hose which they usually attach to the Air tubing and or AIR BOX. It is most likely squirting oil out and is being sucked in through the carb.
Did you by chance overfill the crankcase oil when you changed the oil? That would cause it to blow out the excess oil.
That hose has to VENT so I would take it off whereever it attachs to on the AIR BOX or TUBING and plug up that connector and put a FUEL FILTER on the end of the HOSE and zip tie it high on the frame. That way if it squirts out oil it will drain back down.
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Post by origjoker on May 30, 2013 8:58:23 GMT -5
Pull off your airbox and look for a clear tube hanging down from it, Most likely it's full of oil. This is your crankcase vent tube, During operation your crankcase builds up pressure and it releases air and small amounts of oil while running. This little guy catches the oil and when it gets full it overflows into the airbox and soaks the filter.
IF it did overflow take out the filter and clean the whole airbox with some brake parts cleaner and get a new filter. I ripped out all the stock airbox and emissions garbage and got a UNI filter for mine then ran a tube high on the frame like Alley said with a PCV valve on it to vent air, works like a champ. Advance auto sells the pcv valve...Purolator number is PV1029 and then you just need a foot of clear 3/8" hose and a couple zip ties. Make sure the zip tie at the crankcase is real tight, If not oil will leak out of there and make a mess after a while.
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Post by kingkaymo on May 30, 2013 10:59:20 GMT -5
a fuel filter or PCV valve will work, but a PCV valve is correct for this application because you are venting the crankcase. as the piston goes up and down, air is pumped around the crankcase by the back of the piston. when the piston goes down it pushes air (and sometimes oil) out of the vent. when it comes back out it sucks air back in (hence using a filter to keep from sucking trash inside) but the PCV valve actually closes, causing a vacuum on the back side of the piston which is what you want, as the piston doesnt have to fight the chunk of air underneath it to travel downward.
crankcase pressure can lead to excessive blowby as well, pushing oil past the rings and things. on the china cub clone motors, people even vent the dipstick to relieve excess pressure.
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Post by kingkaymo on May 30, 2013 11:00:49 GMT -5
engines dont stall if their spark plug is getting oily?  if oil can foul a plug... then how would oil fouling not cause an engine to stall? |
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Post by bigmac on May 30, 2013 20:27:28 GMT -5
I checked out that valve cover vent hose and the air box. Surprisingly, I didn't see any oil or residues in the opening of that hose or in the air box. I haven't changed the oil in over 400 miles with no issues up until now, so I don't think there are any problems with excess oil. Pull off your airbox and look for a clear tube hanging down from it, Most likely it's full of oil. I see a clear tube hanging down from a thing shaped kinda like a cylinder that's zip tied to the frame. The tube always looks full of gas. In fact, I assumed it was some kind of tube used to drain the gas tank. I'll try to take a photo of it tomorrow. |
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Post by alleyoop on May 30, 2013 20:42:08 GMT -5
Well if it is not the Valve Cover Vent tube then you have internal motor problems either rings or valve stems leaking.
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Post by bigmac on Jun 1, 2013 15:02:22 GMT -5
If the rings or valve stems were leaking would it likely effect the performance of the scooter? It runs great when I'm riding, just starts to idle too slowly and then stalls at stops.
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Post by alleyoop on Jun 1, 2013 15:11:23 GMT -5
If the rings or valve stems were leaking would it likely effect the performance of the scooter? It runs great when I'm riding, just starts to idle too slowly and then stalls at stops. What you just said indicates loss of compression, low compression on a motor will not hold idle or low rpms. So the first thing you want to do is ADJUST your valves and hope that is all it is. But that is not the cause of oil in the chamber. Alleyoop |
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Post by bigmac on Jun 10, 2013 23:39:04 GMT -5
I finally took a picture of that clear hose. I drained the liquid out of it, but it's not gas. I don't know what the liquid is from, how it got there, or what the part the hose connects to is. Can someone explain this part for me?  |
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Post by kingkaymo on Jun 11, 2013 0:15:16 GMT -5
looks like its part of your crank case ventilation, and i would hope that its just oil.
my elite has a clear hose that comes from the oil/vapor seperator to under the scoot, with a plug in the end. any oil blowing into the separator will drain back into this hose and needs draining every so often. thats what this most likely is. are you sure its not oil? if its not oil or gas, what else could it even be?
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Post by bigmac on Jun 11, 2013 1:43:37 GMT -5
The liquid that was in the hose is not thick at all. It flows like water. My only guess is that it is water with some stuff such as dirt or oil mixed in to give it a yellowish tint.
I used a glass bottle to catch the liquid as it drained. I sniffed near the opening of the bottle to check for the smell of gas. Didn't smell at all like gas though, instead, and I'm not joking, it smelled like butterscotch candy.
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Post by rockynv on Jun 11, 2013 3:56:37 GMT -5
This will happen as your valves get out of adjustment. The bigger the gap the longer they stay closed causing oil to get blown past the rings. Check the valve adustment before going to crazy as many times it just that simple.
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..BAD TO THE BONE..
