Modern Vespa

So I've looked around, for hours.. And I did find people with similar problems, but it always ends up being a clamp that's not tightened, or nothing gets fixed because apparently it just self healed.

But I have a leak coming from the housing of the waterpump. It's not the "funny-shaped" gasket on the waterpump cover where the hoses connect. It's from the dark depth behind :')

And someone mentioned a weep hole? And that it's there for the tiny amount of coolant that can get through to the wrong side.
But there's not a tiny amount in this case, and it's dripping also when cool and not running.

This "gasket cog" (nr10), could that be the problem? Because I'm guessing that the bearings (nr9) are not stopping any fluids from leaking through. And also, I guess there is just air and not oil on that side, because if there was, it would just pour out of the weep hole?

I've been searching like mad man, but can't find any hose or gasket above that could be the source.

you're the pump seal has failed and is leaking.

there is no oil that side, the sump is entirely contained within the motor on these models. it wasn't until the quasar variant that the water pump housing became integral to the engine along with the oil bath stator/flywheel.

you can order the seal, the rebuild kit (that comes with bearings) or the whole housing as a unit and get everything. I like to just order the whole housing and save the hassle of rebuilding the unit. it's not that much more money.

Thanks for your reply greasy125.

I'd love to replace the whole water pump cover, but I'm on a budget, so I have to order just the broken parts and put in a little more effort.

And you mr greasy seem to be a guy who knows everything about these bikes. (Anyone else who wanna help are welcome)

I don't know if you've ever ordered from sip-scootersshop. But I have a hard time to understand what part fits my vespa.
When I "model search" this product shows up R100110070, but it say in the description that it doesn't fit GTL 200, also it doesn't look like mine. (I know the picture can be incorrect)

But I did find another product outside of "model search" R100110230. There's a red banner telling me it doesn't fit my bike, but it looks like mine, and my bike is in the list further down that tells witch models it fits.

I don't expect you or anyone else to look in to this or to be able to give me the right answer.
But I thought I'd give it a try.
I did email sip. But don't know if I can get a correct answer from them or when it comes.

My vespa is a GT 200 L -06
Cheers!

Sorry, I don't know about the part numbers. But but I do know that the water pump rebuild process is not trivial.

The most expensive route is doing it twice! You've probably already checked this. But jyst in case, I'd just suggest making sure you have the tools and ability before committing to the rebuild route:

The GTS waterpump is a different animal to the GT one.

Everything is already taken apart. The gasket and bearings were shit. So I just need to order the right parts and reassemble everything. Don't think it will be a problem. If I can get the right parts.

Thanks for the support!

The SIP site is totally contradictory:
"Repair Kit water pump
for Vespa GTS/​GTV/​GT L 125-200ccm 4T LC
also for PIAGGIO Leader 125-200ccm 4T LC

then:
"ATTENTION at Modern Vespa models: Does not fit on Vespa GT 125/200 4-stroke LC. See article description.

OEM numbers (for comparisons): 485080 - 845633 - 842595 - 82991R - 844730 - 487459 - 872908 (PIAGGIO)"


Numpties. However the parts listed are the same as in the parts list:
https://manuals.wotmeworry.org.uk/Vespa/GT125%20GT200%20Euro2/

So what's up with the warning?

Sccoterpartsco has this:
https://scooterpartsco.com/gt-200-engine-c-3637_3641_3760/water-pump-repair-kit-for-vespa-gt200-p-1391.html

So the GT version can be rebuilt with hand tools only? Good to know for when mine goes. Thanks for the info.

Sounds like you're on your way! Please let us know how it turns out. Valuable info for the few of us still riding GT models!

The GT, GTL and Granturismo are all the same scooter.

There are two versions of the waterpump kit. One has the little black thing that spins around hard fastened to the shaft. The other one, which is the newer version, has it screw into the top of the shaft. Except for some very early GT models, the one with the shaft and black spinning thing separate is the one you need.
The RMS part number 100110230 is the one you need.

... 'black spinning thing' = impeller

one thing I forgot to mention: when you do this job replace the vulcanized screws on the flywheel that index the water pump drive. it's cheap insurance, because if those come apart they trash the plastic drive and at best you get to buy new parts and do the job again. at worst some of that debris gets into the stator and you get to do that job too and cough up some dough for those parts as well.

Lovely Motovista! I knew you I could trust you guys here on MV! Do you mean those three bolts sticking out "too far" and having like a bulky plastic washer? One of mine were of course broken so I added thee new to the cart. Very expensive bolts..
But now I know that they do and I understand why they're important to change! (I almost left them as is). Thanks!

yeah man, those are them. they're actually rubber, but over time they get hard and brittle due to the heat cycles. they're spendy, but a critical piece.

They should make new ones out of metal. But I guess people wouldn't blow their waterpumps as often and order replacement parts then.

Did a quick search for something else than the oem part, but no luck. They will probably last at least during the time I'm the owner.

Thanks again.

Now I've installed the waterpump. It didn't go quite as smooth as I hoped for, but still pretty okay. But now when I'm about to screw the impeller in place and I'm not sure how hard to tighten it.
The gasket/seal seem to tighten around the shaft when compressed. And I can't feel if it's turning freely since it's engaged with the flywheel.

The shaft has a stop as if to bottom out the imprller. But it feels wrong.

The seal doesn't really look like in the pictures from the site.. maybe it's the wrong one? Everything else fitted, so it probably is the right one, I hope.

As long as the parts are all the same as the one you took out, all should be well.

They are not. They are similar, but not the same.
*The seal/gasket is not the same, but everything else is. Maybe just another manufacturer.

We'll see how it goes.

Hey Frallzor,

I realize this is an older thread, but in the picture you posted above it almost looks like the inner portion of the seal isn't pressed on all the way. Was this the case?

I was curious how you made out in your water pump replacement. I'm in the process of it myself and i'm finding the impeller to turn pretty rough after I replaced the seal. I'm wondering if i may have damaged the seal in the process of installing it. The center and outer portions need pressed on at the same time which is very difficult to do without the right tool.

This is exactly why I'm going with a electric water pump on my 05 GT200.

Interesting. Now I've gotta look into this. Got a link?

https://scooterpartsco.com/210-vespa-c-801_802/piaggio-water-pump-for-vespa-gts-super-125-p-8171.html is the pump. I've used it on my GT200, and it mounts right under the right side floorboard. You can look at the service or parts manual from the GTS 125 and see where it goes. There are other pumps that have a 90 degree in to out arrangement, and they don't fit well anywhere on the GT.

Nice. I'll look into it! Thank you!

Malossi makes an electronic water pump controller that you can use in conjunction with the pump. It replaces the thermostat. It's a whole lot more expensive than the thermostat. I haven't used it with my engines, but it's there.


https://scooterpartsco.com/100-malossi-master-part-list-c-170_180/malossi-water-pump-controller-p-15226.html

Electric water pump