Oil leak on my S9......

[buzzbomb]

Hi guys- I just found this great forum, and have read every post, but nothing like I have experienced. I bought my Super 9 AC new in 2008. It currently has a bad oil leak, dripping from the air box. Obviously it is running through the oil pump and out the carb throat, and out to the air box, where it makes a large spot on the garage floor. I had the scooter in the shop last fall, where they had it for 2 months, and replaced the oil pump. After I rolled it into the garage to spend the winter, it leaked just as much, so back to the dealer, where they replaced the pump again. It has been one week, and it is still leaking.
The dealer has been very patient, but they tell me the factory has never seen this happen before, and they have gone through 3 oil pumps so far. I talked to the tech the other day, and he is going to try to get Kymco to get to the bottom of this problem, but it seems replacing the pump is not fixing anything. They say they have never had a problem on any Kymco they have sold. The warranty runs out in July, but he says they will extend it to stand behind this problem. I have no problem with the dealers' work, but this is getting ridiculous.
 Anyone hear of an issue like this, or have any possible solutions? I am (almost) ready to ditch the pump altogether and run premix, but,  I think that would be overkill.
 I cannot find any instances of a large scale oil  leak problem by Googling the issue, and no other accounts like this.
ANY insight on my problem would be much appreciated!

 

[Shaka]

That's a new one on me!   If I understand correctly the oil is just leaking from the tank straight through the pump and into the carb, where it runs out through the air box?  Does it do it while just sitting there, or after the engine has been running.  Did it leak all winter while it was just parked?  That's weird!  If it is under warranty I would stay after it until the problem is resolved!  Otherwise, I don't trust those pumps to begin with!  Premix on anything other than my stock engines!   Too much money riding on the operation of a potentially unreliable pump! 

Ps. Welcome, and keep us posted on the outcome!

[buzzbomb]

Thanks Shaka- I like this group already!
Yes, the oil just drips out the air box, just sitting in the garage. I stored it over winter, and there was a oil spot about one foot diameter on the floor( about  3 months). I just got it back from the dealer for the second time, thoroughly cleaned the air box, rode it 26 kilometers, let it sit one week, and pulled the cover. Oil coated the air box and left a spot on the ground. This is the third pump- the dealer called Kymco, they pulled 3 pumps from inventory, rigged up an oil source on them, and shipped one which, presumably, did not leak. After installation, the tech said it leaked, and they shipped another one, which I have now, leaking on my concrete. I just spent $7000 on a new garage floor and driveway- I want this fixed!
 Like I said, the dealer is very understanding, and willing to fix it, but I cannot believe a large outfit like Kymco would have such an aggravating problem. Is there a lemon law for scooters??
I will be returning it shortly, after they come up with a plan(!) to fix it, and I think they will treat me right, but, man I want to ride this thing further than up onto the trailer!
I will keep you posted.......

[0BARK4322]

I HOPE YOU GET THAT PROBLEM FIXED SOON ALSO I THOUGHT THE OIL PUMP WAS LOCATED LOWER THEN THE AIR FILTER(50CC) SO IF YOUR SCOOTER IS NOT RUNNING HOW CAN IT BE THE PUMP-------MAYBE ITS IN THE LINES(JUST A GUESS) WELL LET US KNOW

[zombie]

I am thinking the same thing as OBARK. It seems the oil would have to flow up hill to get to the box. Can you pull the box off and see what happens? The oil could drip right from the carb. but I don't see how it could get to the air box. And I don't see how it would ever start if there was that much oil in the carb/manifold. It makes 0 sense. Maybe there is a crack in the oil tank that is flowing along the frame to the airbox, or the oil filter is loose on the bottom of the tank. I would pull the air box, and inspect further. Let us know Bro! Almost forgot... Welcome to the forum!

[Shaka]

I could see how the oil would leak, at least the way the set-up runs on the ZX50.  The oil tank is up top next to the gas tank.  The only thing keeping it from flowing out the carb is the oil pump.  If it is flowing out the carb it would either run into the engine or out the air box.  Where is the oil tank located on the S9?  It doesn't make much sense if the tank is lower than the carb as you wouldn't get the siphon effect.  For a siphon to work the inlet and outlet height are all that matter, so as long as the oil tank is above the carb, this could potentially happen. 

[0BARK4322]

WOW-GREAT SHAKA, WELL MAYBE THEY JUST HAVE A BAD BATCH OF OIL PUMPS. WHAT YOU THINK, IF THE TECH SAID IT IS THE OIL PUMP THEN I GUESS HE VISUALLY SEE THE LEAK FROM THE PUMP   

[buzzbomb]

Thanks for the replies, guys. Yes, the oil tank is above the pump, and the carb and air box below that, so it pretty much runs out the carb throat, and out into the hose leading to the air box. I have cleaned it very well, let it sit a couple days, and fresh oil is seeping out the air box hose, which makes it to the bottom of the box. It seems that a check valve, which is supposed to be in the pump, is not working. But 3 new pumps all failing?
 I will most likely get it back to the dealer next week. they know me by name now when I call!
Hmm, I never had a problem like this on my old Yamaha..........that thing had no "pump" per se, only a line from the tank, to some sort of check valve on the carb.
I have a CD with a Kymco shop manual on it, but it is all water cooled- would that be the same oiling system? I will study that.
 I will keep everyone posted. thanks again for the insight.

 

[0BARK4322]

MAYBE THEY SHOULD CHECK THE CARBS

[zombie]

http://www.timtaylor.net/Scooter/Manuals.htm   The manual is on the bottom of that page on the left side.

[Shaka]

Those pumps are not actually pumps per se.  They are just a meter that only lets a certain amount of oil past at any given rpm.  The carb does all of the suction, actually the engine.  The inlet into the carb is just a hole with an outlet down stream of the slide.  The vacuum from the engine pulls oil in as the "pump" meters it out and mixes it in with the incoming air and fuel mixture.  The carb doesn't have any type of valve in it for the oil.  Apparently the pump is just letting through as much oil as wants to flow past.  I guess on a positive note, at least it is not letting any oil through!