Stella 4T crank replacement

mjrally · Post by **mjrally** » Mon Jul 13, 2020 6:31 pm

Friends Stella 4T crapped out with 2K miles. I cant find any sources for a replacement crank. Other than the 200 motor swap from SIP does anyone have any recommendations? Iâ€™m still waiting to hear from Vespa Motorsports.

Thanks all.

Dooglas · Post by **Dooglas** » Mon Jul 13, 2020 7:27 pm

If your friend is not interested in the substantial investment in the S.I.P. 200cc engine, then I'd say the other choice is to attempt to find a damaged Stella 4T with the engine in running condition. Unfortunately the discontinuing of the Stellas means that parts, especially for the 4Ts, will relentlessly disappear. There is that tough question of just how much your friend wants to invest in an orphaned scooter.

mjrally · Post by **mjrally** » Mon Jul 13, 2020 7:45 pm

Dooglas,

Thanks for the reply.

The search continues!

youkiddin · Post by **youkiddin** » Mon Jul 13, 2020 10:15 pm

looks like sip may have a small stash of 4t cranks yet https://www.sip-scootershop.com/en/prod ... r_51300270

mjrally · Post by **mjrally** » Fri Oct 02, 2020 5:27 am

I just wanted to wrap up this thread with an update.

SIP was sadly back ordered on a lot of essential parts but I found Scooterworks had a replacement crank for double the price of SIP (ouch) and whatever else was missing. Couldnâ€™t find any other US shops with parts but Iâ€™m happy with SIP and SW.

First off was taking a lot of pictures. This was totally unknown territory and I needed all the help I could get.

Motor dropped it split apart pretty easily. Since the crank was already damaged I didnt worry about being gentle with it. A few good whacks with a hammer and it fell out of the cases. Gaskets were glued in so it took a whole day with a razor blade to clean all the surfaces (I made the owner do it

).

Everything inside looked pretty good but while there I changed the shift cross, kickstart buffers, oil filter, a few o rings and gave everything a good scrub.

Reassembly was quick until I got to the timing gears/chain. The service manual I downloaded from motor scooter guide.net was helpful but I still scratched my head a few times putting everything together. Long story short, before you tear down, remove the clutch and line up the crank/ timing gear/ oil pump gears and mark where they mesh with a paint pen. Lots of variables!!!

Once that was sorted everything went together pretty straightforward and everything was torqued to spec. I checked the valves and they were too tight so adjusted them, stator in, gas on, a few Hail Marys and I kicked it over. Second kick she fired up and purred like a kitten.

Owner was stoked and is off terrorizing everyone with his stock sewing machine muffler!

I told the owner that sadly anything major that would happen with this engine would probably be the death of it. Parts are harder to come by and it wasnt a popular model in the States. Told him to save up for the 200 crate motor or buy a two stroke.

Hope this helps someone in the future.

BuddyRaton · Post by **BuddyRaton** » Sat Oct 03, 2020 5:49 pm

That old crank is just painful to look at. Nice job.