Modern Buddy

We do a lot of Stella rebuilds. I use this as an example all the time. When a Stella 2T has to come apart for some reason. If you replace all the bearing with good quality ones, and use a Mazz crank; she will run for years.

There are many stellas out there with stock parts that go a long ways, but IF you have to ever rebuild one. This is a good example of why to use "the good stuff"

https://www.youtube.com/watch?v=ognz3eVgoQ4

How's them on the 4T?

Have not had a 4T apart yet thankfully.

I have seen a few with over 10k MILES. So far, so good on the 4T. I would do frequent oil and filter changes and run good oil.

I change the oil every 1000, filter every 2000. With Amsoil. I'm hoping to hit 10K before the warranty runs out. I figure if it doesn't blow by then, I'm OK.

Improved 4T crankshaft bearings required some digging to source.

The originals are made by SKF India and measure 25mm x 68mm x 12mm (inner diameter, outer diameter, thickness). For comparison, the clutch side bearing in most of the largeframe Piaggio motors and 2T Stella motors measures 25mm x 62mm x 12mm.

The Italjet Dragster 125/180, Gilera Runner 125/180 and the pre-LEADER Vespa ET4 125 use the same bearing as the 4T Stella. NTN Japan builds it; the part code is SCO5B31CS37.

Can't speak on the big end bearing yet. Will likely need to press a crank apart to measure that and find a replacement.

4t are are a lot more forgiving on bearings than 2t which run on basically borderline lubrication. But why half ass it with shit Indian or Chinese bearings when you can go with quality American, Japanese, or European bearings during a rebuild.

^^^ Exactly, if you have it apart, what is a few more bucks for the best bearing you can find.