Oil Leak???
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05' PX150
Joined: 13 Mar 2019
Posts: 34
Location: Bellingham, WA
Mon Jun 03, 2019 6:35 am quote
Greetings.

I'm finding oil on the ground beneath my 05 PX150 after being parked for a while but its not coming from the oil drain plug area. Its accumulating on top of the muffler mostly visible on the spare tire side of the scooter and dripping off the muffler. I think it may be less if I turn the fuel valve off but not 100% sure.

Any ideas how to investigate would be appreciated. The bowl that the carb sits in is dry. I removed the bolts that hold that black plate on beneath the seat but something down lower obviously needs to be disconnected before the tanks can be removed. I didn't see any oil around where the oil sight glass connects to the oil tank. I don't see evidence of leaking on the engine side of the scooter.
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Yamaha Tricity 155 2018 - MV Agusta 125 RS 1956
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Mon Jun 03, 2019 9:03 am quote
Oil seal ... maybe behind the rotating magnet...
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1980 P200E project, 2005 Stella Malossi 166 MKIII
Joined: 20 Jul 2018
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Location: Staten Island, NY
Mon Jun 03, 2019 9:13 am quote
Maybe clutch oil seal? Or from the carb. Make sure carb bolts are torqued. Or remove the carb and replace gaskets then torque down to spec. That got rid of most of my oil issues.
Member
05' PX150
Joined: 13 Mar 2019
Posts: 34
Location: Bellingham, WA
Mon Jun 03, 2019 9:28 am quote
Thanks.

I'll look at those seals. I don't suspect the carb gasket since I've been "in there" recently but I'll double check that.

I think my clutch needs rebuilding so maybe its time to bite the bullet and dive into it.
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1980 P200E project, 2005 Stella Malossi 166 MKIII
Joined: 20 Jul 2018
Posts: 501
Location: Staten Island, NY
Mon Jun 03, 2019 9:39 am quote
Bhammer wrote:
Thanks.

I'll look at those seals. I don't suspect the carb gasket since I've been "in there" recently but I'll double check that.

I think my clutch needs rebuilding so maybe its time to bite the bullet and dive into it.
It's really easy, don't be afraid of it. All you need to do is remove the rear wheel and hub for easy access. While you are in there you should upgear the clutch to 22T if you have 21T by default. It is a nicer range of power in lower gears than 21T (at least on Stella 150).
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1980 P200E project, 2005 Stella Malossi 166 MKIII
Joined: 20 Jul 2018
Posts: 501
Location: Staten Island, NY
Mon Jun 03, 2019 9:48 am quote
BTW, when you got in there and did the carb recently, did you remove the carb box and replace that gasket between the box and the engine as well as the one inside the box below the carb itself? The carb box gasket can go bad and cause leaking as well.
Member
05' PX150
Joined: 13 Mar 2019
Posts: 34
Location: Bellingham, WA
Mon Jun 03, 2019 10:05 am quote
Good question. No I didn't - worth revisiting.
Member
05' PX150
Joined: 13 Mar 2019
Posts: 34
Location: Bellingham, WA
Mon Jun 03, 2019 10:07 am quote
Where do you suggest I purchase my clutch rebuild kit? I've used most the common suppliers for parts and have had good luck with all of them including SIP although their shipping costs can be high for us on this side of the pond.
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1980 P200E project, 2005 Stella Malossi 166 MKIII
Joined: 20 Jul 2018
Posts: 501
Location: Staten Island, NY
Mon Jun 03, 2019 10:09 am quote
Bhammer wrote:
Good question. No I didn't - worth revisiting.
Clean the case off around the base of the box and check it again after a few days of riding to see if it's dirty again. Either way it's a cheap part and quick replace worth doing anyways.
Hooked
2005 Vespa PX 150
Joined: 23 Feb 2010
Posts: 228
Location: Houston, Texas USA
Mon Jun 03, 2019 7:01 pm quote
Here's a couple of other things to check (from personal experience):
#1 When I got my 1st 2005 PX it had sat in the crate for 3 years until I bought it in 2008 so the fuel and oil lines had dried up and cracked.
It was the oil line that started leaking first, inside the body, and then dripping out onto the exhaust. Smelled like plastic burning when the muffler would heat it up.

#2 The next thing I learned was to not fill the oil reservoir all the way up to the top of the neck. It leaks out like you had over-filled it (which I guess it was).
Same symptoms as #1 above and I thought my oil line was leaking again until somebody on this forum set me straight.

#2 is an easy fix, #1 is a little more involved but still both of these are a lot easier than some of the other other suggestions so unless you have already replaced your lines I would pull the tanks and look under there.

Hopefully it will turn out to be one of these simple fixes.
I'll keep my fingers crossed for you.
Member
05' PX150
Joined: 13 Mar 2019
Posts: 34
Location: Bellingham, WA
Tue Jun 04, 2019 6:09 am quote
Good troubleshooting suggestions Aiosi. I'm going to rebuild my clutch anyhow but I will also check all of those possibilities.

I'm going to start a new thread to address my clutch rebuild since I have more questions specifically about that procedure.
Molto Verboso
2005 PX150 In a Love-Hate Relationship with a 2-Stroke Vespa Since 2007
Joined: 01 Sep 2007
Posts: 1791

Tue Jun 04, 2019 5:27 pm quote
I had problem #2 with my 05 too until I took the tanks apart, cleaned up the joints, and properly reassembled it. I can fill it all I want now without a leak. I figured mine must’ve been put together late on a Friday afternoon.
Member
05' PX150
Joined: 13 Mar 2019
Posts: 34
Location: Bellingham, WA
Tue Jun 04, 2019 7:20 pm quote
I'm posting a new thread since this is turning into more of a clutch rebuild project. When I make discovery or progress on the oil leak I will return to this thread. Typical one project starts to multiply.
Member
05' PX150
Joined: 13 Mar 2019
Posts: 34
Location: Bellingham, WA
Wed Jun 05, 2019 1:43 pm quote
OK I've got my clutch out and am well along on that project. If any oil is leaking from the clutch it should be mitigated after replacing all the rubber seals.

I noticed fresh oil on the muffler. It' got to be coming from the tank above. I've just drained the fuel and oil am about to try removing the tanks......
Member
05' PX150
Joined: 13 Mar 2019
Posts: 34
Location: Bellingham, WA
Wed Jun 05, 2019 1:57 pm quote
Eureka! There was a small pool of oil under the tanks. Looks like its coming from where the bottom of the fill tube connects to the oil tank. Shouldn't be to hard to seal this up correctly.

20190605_145124.jpg

Member
05' PX150
Joined: 13 Mar 2019
Posts: 34
Location: Bellingham, WA
Wed Jun 05, 2019 1:59 pm quote
The oil tank is still 3/4 full. I used a golf T stopper. I'll need to empty the tank before taking apart all connections for inspection.

20190605_145143.jpg
Tankage:

Member
05' PX150
Joined: 13 Mar 2019
Posts: 34
Location: Bellingham, WA
Wed Jun 05, 2019 2:35 pm quote
Either the factory assembler or PO messed up the threads on the plastic fitting where the oil tank connects to the bottom of the fuel tank. The black colar turns and turns but the tank is not coming out. Not sure if I'm going to have to sacrifice something to get it apart?

20190605_152956.jpg
Oil would leak from here if over filled.

Member
05' PX150
Joined: 13 Mar 2019
Posts: 34
Location: Bellingham, WA
Wed Jun 05, 2019 2:36 pm quote
Ingenuity:

20190605_153007.jpg
Its actually hanging vertically:

Member
05' PX150
Joined: 13 Mar 2019
Posts: 34
Location: Bellingham, WA
Wed Jun 05, 2019 2:38 pm quote
pdxjim hit the nail on the head with this one.
Molto Verboso
2005 PX150 In a Love-Hate Relationship with a 2-Stroke Vespa Since 2007
Joined: 01 Sep 2007
Posts: 1791

Wed Jun 05, 2019 3:00 pm quote
If you pull apart the joints, make sure to slightly lube the rubber gaskets before tightening back up so they’ll seat without twisting out of shape. Another point of leaks is the plastic sight “glass”.

Hanging it up like that is the best way to look for leaks before you drain the oil and fix it. After you fix it, fill it up again while keeping it hanging for another day or two to make sure you got them all.
Hooked
1955 Allstate 1958 lambretta 1965 Allstate 1968 sprint
Joined: 20 Jul 2017
Posts: 274
Location: Central california
Wed Jun 05, 2019 3:58 pm quote
Oil leak
Well I know on my vespas, sometimes oil can build up around the case vent. Too much oil can cause it to get “flung” inside the case and out of the vent. Just a thought...scott
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1980 P200E project, 2005 Stella Malossi 166 MKIII
Joined: 20 Jul 2018
Posts: 501
Location: Staten Island, NY
Wed Jun 05, 2019 4:05 pm quote
Congrats on finding the leak. If the threads are messed up you can get a replacement oil tank for not much.

Last edited by swiss1939 on Wed Jun 05, 2019 4:12 pm; edited 1 time in total
Ossessionato
1976 Super (x 2), 1974 Primavera (x 2), 2006 Fly 150
Joined: 26 Sep 2013
Posts: 4595
Location: So Cal
Wed Jun 05, 2019 4:09 pm quote
Good sleuthing and extra macgyver points for the ingenious tank hanger/drip detector.
Hooked
2005 Vespa PX 150
Joined: 23 Feb 2010
Posts: 228
Location: Houston, Texas USA
Wed Jun 05, 2019 9:48 pm quote
Caongratulations!

Now if somebody could only come up with a simple way to get it all back in there.
I use a length of surgical tubing stuck over the fuel tap handle to pull it and kinda' guide it back in place.
But it is still a test of my patience.
Member
05' PX150
Joined: 13 Mar 2019
Posts: 34
Location: Bellingham, WA
Thu Jun 06, 2019 6:09 am quote
New discovery - the bolt that holds the oil outlet and filter thingy on inside and at the bottom of the tube that goes down into the plastic tank that the oil hose attaches to was not on. At first I thought the nut was not there but then I saw it down at the bottom of that dark black tube that extends from the bottom of the fuel tank. I tipped the tanks upside down to get it out and when reassembling broke the hollow threaded part that holds the filter so now I'll have to wait for that new part before putting it back together.

Getting that nut on is quite challenging. I used electrical tape to hold the nut in a deep socket with two long extensions on my ratchet. Then after getting the nut started and pulling the socket out I had to fish the little piece of electrical tape out with a home brewed dental like tool taped onto a long screwdriver.

Turns out the black plastic compression collar may have been OK but I'm going to replace it along with a new O ring.

I also got new fuel and oil lines and clamps.

Keepin on buggerin on...
Molto Verboso
08 GTS 250, 79 P200E, 62 Allstate
Joined: 11 Jan 2006
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Location: Florence, OR
Thu Jun 06, 2019 7:43 am quote
Hey BHammer,

I've delt with the exact same thing. Great job troubleshooting the issue. And I like your rigging of the "Hanging of the Tank"....
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1974VLB 1979VSX 1974V9A
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Thu Jun 06, 2019 8:49 am quote
Re: Oil leak
Sjanuary wrote:
Well I know on my vespas, sometimes oil can build up around the case vent. Too much oil can cause it to get “flung” inside the case and out of the vent. Just a thought...scott
Have you ever actually seen definitive evidence of this? I've read this here and there for years but I've never had it be the source of a leak. If one looks at where the oil is in the case and the design of the vent it seems totally impossible... or so unlikely to happen enough consecutive times to warrant a consistent leak.
Molto Verboso
Joined: 26 Oct 2015
Posts: 1373

Thu Jun 06, 2019 9:49 am quote
Bhammer wrote:
New discovery - the bolt that holds the oil outlet and filter thingy on inside and at the bottom of the tube that goes down into the plastic tank that the oil hose attaches to was not on. At first I thought the nut was not there but then I saw it down at the bottom of that dark black tube that extends from the bottom of the fuel tank. I tipped the tanks upside down to get it out and when reassembling broke the hollow threaded part that holds the filter so now I'll have to wait for that new part before putting it back together.

Getting that nut on is quite challenging. I used electrical tape to hold the nut in a deep socket with two long extensions on my ratchet. Then after getting the nut started and pulling the socket out I had to fish the little piece of electrical tape out with a home brewed dental like tool taped onto a long screwdriver.

Turns out the black plastic compression collar may have been OK but I'm going to replace it along with a new O ring.

I also got new fuel and oil lines and clamps.

Keepin on buggerin on...
...and remember that the fuel line routes though that metal bracket thingy that at the bottom of the oil reservior outlet.
Molto Verboso
Joined: 26 Oct 2015
Posts: 1373

Thu Jun 06, 2019 9:52 am quote
Bhammer wrote:
Getting that nut on is quite challenging. I used electrical tape to hold the nut in a deep socket with two long extensions on my ratchet. Then after getting the nut started and pulling the socket out I had to fish the little piece of electrical tape out with a home brewed dental like tool taped onto a long screwdriver.

Also hold tank upside down when installing the nut. It makes it a much easier job.
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