Modern Vespa

My drive shaft seal is leaking like a sieve. It's a P200 motor with malossi V-one case that I got about a year ago with very low miles on it. I think it had slow leak when I got it. I was swaping this motor to another scoot and when I pulled the hub off all the oil poured out.

Anybody have any ideas on how this got buggered up? Was the hub tightened too much. The hub took some effort to remove. I had to tap it from behind with a block of wood and a mallet.

Can I just replace the seal or do I have to go deeper? I was thinking of using one of these viton ones:

https://www.sip-scootershop.com/en/product/oil-seal-driveshaft-malossi-viton-30x47x6-mm_M6616199B

Is the seal the right size for your hub? Should be either 27 or 30mm. Make sure it's matchy matchy!

V-one case. Isn't that an internal oil seal. Looks like it's using the wrong drive shaft. Bodgery going on no doubt.

Your hub actually has a 30mm flange on the inside that plugs into that seal. Put a new seal in, check the surface of the hub and make sure it isn't buggered up then reinstall. Normal for the juice to spill out with the hub off. PX's have an internal seal but many people seem to like the external better.

Hey Jack, you can use either driveshaft in the Malossi cases and it's possible to double seal it if you want to get crazy. I just did mine and chose the sealed bearing and external seal on a Scootopia hub.

Ok. Thanks guys. Good info.

I believe the drive shaft was sourced from doner P200e motor that had a problem with its case. So they just moved most the parts to the Vone case.

The seal that's in there is a 27x47. I'll check my hub and see how the surface looks. If the hub has a 30mm flange, does that mean I need a 30x47 seal?

Here's mine. EFL shaft, 30mm Malossi external seal. If you run an internal seal, provided you're running the late model shaft, if it goes bad you're splitting the cases to fix it.😳

Like I said bodgery. It works if you have cases without the breather hole or blocked but doesn't make it right. The internal seal is safer. The late EFL shaft is stronger. I wouldn't advise a safety downgrade, even if stock.

Looks like you have the wrong seal in there. Check your hub.

The hub diameter is a bit over 27mm. Looks like I need a 27mm seal. Do these go bad often (my slow leak)? Or was it operator error?

Thanks for the quick response guys. That was just minutes before all the great replies

Hub flange looks ok, as far as I can tell

Check out Gicks 210 Malossi thread. He's running the same set up as mine, external. FMP has a great video detailing the whole bodgery. I don't mind if your new name for me is BodgeRob. Maybe the Bodge Brothers? 🤣😂 All in fun Jack, I respect all your knowledge. Your posts have helped me out.

Even if you put an inside seal there's no weep hole on the Malossi cases. I stayed with the outside setup on mine…

someone needs to get with Malossi and let them know they bodged their own case. LOL. yes, you are right, no weep hole.

i've installed external seals on two Malossi cases. no problems but i guess i do bodge work.

I need to find my Grandfathers Model A and B John Deer.

Your hub looks skinny to me. I measured mine and it was 30. I have both seals and a 27 definitely won't go on. Maybe someone turned your hub down at some point..

Just guessing, but I think the older pre-EFL hubs are 27mm and the new EFL ones are 30mm. I looked into that reinforced Scootopia hub, says you just need to swap the seal to fit older motors/safts.

That's expected/what happens unless you drain the oil first.

If that seal had even a slow leak it would have been obvious.
The brakes stop working.

Yup. Nice to be taught the basics

Looks like you're totally right on the different hubs. I have a P and a Px hub and both 30mm. Hopefully a new seal for you is all it needs.

My thought is go with whatever seal works best for your rear drum. I personally find the EFL internal seal style (with the even larger 31.5mm felt ring) to be the most robust. It's pretty uncommon (possibly even rare?) to come across a PX with EFL in the US, so it's something that most of us yanks don't ever come across.

This is what concerned me. The sealed bearing is grease packed and....sealed. The external oil seal needs lubrication or it will not last. Also oil cooling of where the hub heat, touches the seal doesn't hurt. With use the sealed bearing will slowly pass some oil, displacing it's internal grease.
It will work, obviously. Not exactly ideal. However, internal EFL seals never leak. Most last the life of a scooter. You strike me as a guy who strives for perfection. This is what I meant.

That's the motor my vmc177 is on. An EFL PX in the states.

It really bugged me on which way to go on the seal/bearing setup on my build. If this case had the weep hole it would be a no brainer. Dealing with lots of Harley stuff (not all by choice) has given me confidence in the sealed bearing for this app. I always grease my seals and hadn't had an issue with them going to term without oil backup from the case. When considering the internal seal guess I just sided with the convenience of the external one. We'll see how it goes.
As for the OP's issue I blew it on not thinking the earlier style hub with the 27mm seal would've been used on the V1 cases. My head was set on V1 = all upgraded parts but his mention of the old P parts didn't register in my brain.🫣 MJRally saved the day though!

The purpose of the weep hole is to let the internal pressure out so it does not push through the seals? Where is it in the stock case?

The weep hole is for when the internal seal fails. Oil will leak from the hole instead of going to the brake shoes. It's located in the gap between the seal and the bearing…

Ok, make sense. Now I understand the context of internal and external

"The internal seal was done for legal reasons, not as an improvement."