05 PX 150 Clutch Work
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Enthusiast
05' PX150
Joined: 13 Mar 2019
Posts: 89
Location: Bellingham, WA
Tue Jun 04, 2019 7:34 pm quote
So I started chasing an oil leak problem and landed here - something probably unrelated to the oil leak - unless the clutch cover O-ring was leaking.

I discovered most of the instructional info for clutches doesn't cover the SOCA clutch. For example, my clutch isn't castellated.

I only removed the wheel - not the brake cover. After removing the shock and lowering the engine a bit to give me slightly more real estate I was able to access my clutch retaining nut with a 17 mm socket and using one of the three small clutch cover bolts for leverage with a screwdriver and the slats in the side of the clutch remove that nut. Now I'm going to build a compression tool with a bolt, nut and washers and take the clutch apart.

I expect I will just replace the steel and cork plates and springs (if I have springs?), the O-ring and any other small misc parts. I don't have high hopes that this will solve my oil leak but I think I was ready for a new clutch.

I'm guessing the oil is coming from some connection at the tank or piping or from over filling although I don't know where it would leak from over filling? Fresh oil was leaking from somewhere "above" I think and onto the top of the rear side of my muffler and onto the ground. But more on the clutch side of the muffler. It seemed to be slightly less, maybe, when I would close the fuel valve?

Onward.....
Ossessionato
1980 P200E , 2005 Stella 177
Joined: 20 Jul 2018
Posts: 2181
Location: Staten Island, NY
Tue Jun 04, 2019 7:39 pm quote
there are also two o ring gaskets on the clutch rod the cable attaches to. at least on my LML clutch. You should also check those by removing the rod from the clutch cover. Rubber gaskets are cheap.

EDIT Image of the rod I am talking about removing and checking gaskets on is here:
Enthusiast
05' PX150
Joined: 13 Mar 2019
Posts: 89
Location: Bellingham, WA
Wed Jun 05, 2019 6:37 am quote
Thanks swiss1939. I'll inspect those parts and most likely add them to my grocery list. I'll also try and upload some photos today.
Enthusiast
05' PX150
Joined: 13 Mar 2019
Posts: 89
Location: Bellingham, WA
Wed Jun 05, 2019 1:33 pm quote
The COSA clutch:[/img]

20190604_200701.jpg

Enthusiast
05' PX150
Joined: 13 Mar 2019
Posts: 89
Location: Bellingham, WA
Wed Jun 05, 2019 1:35 pm quote
I'\m having trouble loading images?

20190604_200641.jpg
other side

Enthusiast
05' PX150
Joined: 13 Mar 2019
Posts: 89
Location: Bellingham, WA
Wed Jun 05, 2019 1:36 pm quote
OK maybe I'\\m figuring this out?

20190605_090421.jpg
The work

Enthusiast
05' PX150
Joined: 13 Mar 2019
Posts: 89
Location: Bellingham, WA
Wed Jun 05, 2019 1:38 pm quote
The inards:

20190605_090525.jpg
clutch plates

Enthusiast
05' PX150
Joined: 13 Mar 2019
Posts: 89
Location: Bellingham, WA
Fri Jun 14, 2019 2:45 pm quote
Question - so I got my clutch put back together and installed. I tightened the clutch cable lock thingamjiggy where the clutch lever is fully extended and the cable is just snug but this is not engaging my clutch. Is it typical that you need to actually pull the clutch lever out some before tightening?

My fear is that the clutch is not engaging for some other reason (internal?) but I will continue to mess with that lock nut thingamajiggy, the cable and clutch lever ...
bodgemaster
1963 GL, 1976 Super (x 2), 1974 Primavera (x 2), 2006 Fly 150
Joined: 26 Sep 2013
Posts: 5407
Location: So Cal
Fri Jun 14, 2019 3:03 pm quote
clutch adjustment
Ossessionato
1980 P200E , 2005 Stella 177
Joined: 20 Jul 2018
Posts: 2181
Location: Staten Island, NY
Fri Jun 14, 2019 5:34 pm quote
follow that thread socal posted. It also helps to use some zip ties to hold the clutch arm in enough to take up the extra slack, then a fourth hand tool to set the clutch nipple in place while you tighten it. check it is not too tight by running engine and seeing if it works once installed. if too tight, adjust the nipple.

I've learned that zip ties are my friends when installing clutch and drum brake cables. Without them, you'll be swearing for hours.
Style Maven
74 50s x3 78 P200 84 Cosa PK50XL2 58 AllState 68 Sprint 80 50special '66(?) Super125
Joined: 22 Nov 2010
Posts: 7845
Location: seattle/athens
Sat Jun 15, 2019 5:57 am quote
Bhammer wrote:
Question - so I got my clutch put back together and installed. I tightened the clutch cable lock thingamjiggy where the clutch lever is fully extended and the cable is just snug but this is not engaging my clutch. Is it typical that you need to actually pull the clutch lever out some before tightening?

My fear is that the clutch is not engaging for some other reason (internal?) but I will continue to mess with that lock nut thingamajiggy, the cable and clutch lever ...
Are you saying that it's engaged but you can't release it? You can check the clutch action at the motor end before involving the cable and adjustments by straddling the clutch lever with open end of a combination wrench w/ a screwdriver thru the box end for leverage. You should not be able to turn the rear drum w/ the bike in gear yet, the clutch is holding.

Now twist the wrench and you'll feel soft resistance from the return spring until you hit strong resistance from the actual clutch springs. Keep twisting and you should be able to turn the rear brake drum now. If so, you probably got it back together right and you can move on to connecting and adjusting. If not, you probably need to look inside again.

In the pic you'll notice a short piece of outer cable behind the lever, in front of the thingamajiggy(pinch bolt). Good idea and cheap insurance, more info here: Clutch cable brakes often

twist.jpg
I'm just past the return spring & starting to push the clutch open

Style Maven
74 50s x3 78 P200 84 Cosa PK50XL2 58 AllState 68 Sprint 80 50special '66(?) Super125
Joined: 22 Nov 2010
Posts: 7845
Location: seattle/athens
Sat Jun 15, 2019 9:53 am quote
BTW, I use these and mostly avoid upside down clutch adjusting and grubby front brake tinkering. I think they're well worth it, especially as the years go by. You can get original style or dog leg, black or aluminum. These are from SIP.



Enthusiast
05' PX150
Joined: 13 Mar 2019
Posts: 89
Location: Bellingham, WA
Sun Jun 16, 2019 2:15 pm quote
Clutch frustration...
So I removed the clutch (again) and made sure all the friction plates were installed in the correct order. When I re-installed the clutch the second time I suspected that I may have not got the clutch to slip over the "key" that is in the shaft the first time around. Now I got the clutch cover back on but the lever doesn't seem to meet the resistance of the clutch. I can rotate the clutch lever seemingly all the way by hand - just turning/pushing it against the resistance of the spring - but with the scooter in gear the hub won't turn.

Do I need to drain the oil prior to removing the clutch cover? I'm thinking not, that the oil is only pulled up into the clutch area only when the motor is running.

Could the little brass bushing in the center of the clutch cover at the end of the arm fallen out?
Enthusiast
05' PX150
Joined: 13 Mar 2019
Posts: 89
Location: Bellingham, WA
Sun Jun 16, 2019 2:28 pm quote
My Bad...
I just discovered I forgot to put the release plate back in after securing the Cosa clutch nut. The brass bushing at the end of the push rod had nothing to push against.

Going back in.......
Ossessionato
1980 P200E , 2005 Stella 177
Joined: 20 Jul 2018
Posts: 2181
Location: Staten Island, NY
Sun Jun 16, 2019 2:48 pm quote
that would be it. good catch!
Enthusiast
05' PX150
Joined: 13 Mar 2019
Posts: 89
Location: Bellingham, WA
Sun Jun 16, 2019 3:10 pm quote
Got the release plate back in and now back to square one. The clutch doesnt want to engage when I pull on/turn the clutch arm. And now the end of the clutch cable is messed up from too many attempts at setting the set screw nut thingamajiggy.

I'm going to order a new clutch cable and talk to the supplier/shop about what I am experiencing to see if he has any ideas whats going on.
Enthusiast
05' PX150
Joined: 13 Mar 2019
Posts: 89
Location: Bellingham, WA
Sun Jun 16, 2019 3:20 pm quote
After I get my new cable in I'll follow the clutch adjustment links provided by SoCalGuy and see where I end up....
Enthusiast
05' PX150
Joined: 13 Mar 2019
Posts: 89
Location: Bellingham, WA
Mon Jun 17, 2019 12:08 pm quote
Feeling Better
I picked up a cable from a local bike shop and slipped it in the cable housing. After taking up the slack in the clutch arm and securing the cable end I started the scooter, pulled on the clutch lever and shifted into gear. I felt very little forward momentum. With the fine-tuning adjustment all the way in I am confident that I will be able to adjust the cable so that the clutch works properly - with a new and correct cable of course.

I found the most difficult part of this job - never mind all the little operator errors - to be securing the little cable nut.

Now I just need to take out the most important tool in the toolbox - my wallet - and order a new cable.

I'll confirm all is well after I get the job done.

Thanks all.
Enthusiast
05' PX150
Joined: 13 Mar 2019
Posts: 89
Location: Bellingham, WA
Fri Jun 21, 2019 3:35 pm quote
Time to close this thread down. My Vespa runs better than ever (I'm knocking on wood). After getting the clutch adjusted pretty close - there was still a noticeable forward momentum when I shifted into first. I figured I'd sleep on it and fine tune the adjustment in the morning. This morning I tightened it up a bit and it was worse. It would lurch and stall when shifting into first. I was afraid I would have to remove the clutch again but after I loosened the cable and readjusted it I started it up and it shifted as it should. Then after noticing some difficulty shifting I went into the gearbox adjustment box and poked around and actually loosened those cables ever so slightly and it shifts easier. With my oil tank fitting leak fixed and a new idle adjustment screw (the tip of old one actually broke off and I was able to poke it out from the inside of the carb), the scooter is running better than ever and not a drop of leakage.

I'm sure its just a matter of time so until next time......

And thanks all for the feedback. Any feedback that gets the gears moving upstairs is well appreciated.
Enthusiast
05' PX150
Joined: 13 Mar 2019
Posts: 89
Location: Bellingham, WA
Fri Jun 21, 2019 3:45 pm quote
The US 05 PX 150:

20190621_163804.jpg
Ready to go...

Molto Verboso
Vespa
Joined: 19 Jun 2007
Posts: 1156
Location: California
Fri Jun 21, 2019 7:51 pm quote
Outstanding scooter looks good
Ossessionato
1980 P200E , 2005 Stella 177
Joined: 20 Jul 2018
Posts: 2181
Location: Staten Island, NY
Fri Jun 21, 2019 8:22 pm quote
Great job! enjoy riding it now!
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