Modern Vespa

On the older type pre-px motors the crank bearings are held in the cases by a brass bushing. I've got a worn brass bushing on the left side of the case which holds the clutch side crank bearing. There's a bit of play which allows the bearing to move about. what's a good fix for this besides having to resort to locktite?

why not a new bearing and bushing? they both sound worn i guess.

I am definitely putting in a new bearing but the bush is in the cases itself and i'm not sure how it can be removed or where to get a replacement.

not sure if you've seen these brass bushings before. They're pressed into the cases.

some people here sometime make coarse with nail the bushing surface but I don't recommended...
you can bring it to the lathe shop and replace that brass bushing

my mech is suggesting to have the bush surface roughed up too which i am against. Any idea where i can buy this bushing?

Hello

Pull the bushing out and either fit new or make larger with a little solder round the outside.

Grumpy

anyone got a spare set of brass bushings part no. 80992?

Usually I get easily at local store, I'll check tomorrow and I'll inform on monday...
or you can ask to your lathe shop maybe they have stock

Thanks Nino. I've tried searching but there aren't any here, usually when the brass bushing wears out people just get new cases. My mechanic says the lathe/machine shops here are not up to the task of replacing the brass bushings but i want to give it a try. Let me know. Thanks again

I've checked at local store yesterday, they never sell that part again... the guy at store said that if you want it you can get it on the lathe shop...
and I'm not yet have sufficient time to ask about that to the lathe shop... sorry
maybe you can ask to your local lathe shop

Hi there, I know that it is a little late for this but was wondering how was this problem solved as I am experiencing the same. I have found a place that sells the brass bushings and enquired about it and apparently the best way around it is to cut the old bushing out ( the tricky bit) and push the new one in. I guess cut them with a dremel and make kind of a bench press and push it in, but this is only theory though !!!

would like to hear someones experience on this.

cheers

tom.

Hi welcome to the forum.

its as you say it is. i wouldnt imagine if you nicked the side while cutting it out would matter much, and heat the cases/freeze the bush before refit. A better way would be to give it to a machine shop and they would both get it out with a large internal puller and push the old one in.

I've had the same problem on my GL Touring now for over a year.

It turned out those bushings are no longer available here, but if you know where to get them, please PM me! Right now I'm looking for a new set of cases to move over everything from my old motor, but I'd rather replace them if possible.

Didn't think this thread would be revived 4 years later...

Anyway I don't recommend you DIY for this unless you have access to the right machinery. I brought it down to an engineering shop and they cut the old brass bushing out and machined another to fit. Fit of the bushing needs to be 100% true and level with the other side of the case otherwise you'll have trouble fitting the crankshaft and casings together, and even if you do succeed you may find that your crankshaft won't be able to turn freely.

In my case (pun not intended) this worked fine and the new bushings went in. However 1 year or so down the road the bearing was loose in the bushing again. I blame this on poor tolerance on the replacement bushing that was machined. If you can find the original vespa bushings it may be better as no one knows whats the exact measurement.

Where I live, it's hard to find an engineering shop (machine shop/lathe shop) that is qualified and experienced enough to do this well. I too wanted to keep the old engine but for all the pain, trouble and money it would be better to just get a set of new cases.