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Apparently, it’s been laid up since the late ‘70s. It does need a weld or two. It came with SX200 push in buffer forks and a headset. Sadly, the toolbox has been hacked at though. Luckily, I do have a spare grey plastic one.

No engine though so, in the fullness of time, I’ll be looking for an matched SX one.

Nice find Paul

Nice one Paul looks like it will keep you busy , look forward to your progress and Pics

What was the original colour Paul?

Knowledge wrote:What was the original colour Paul?

Martin, it’s white (I think they were New White) and, by the looks of the inner horncasting, it had blue horncasting and panels. When I take the horncasting off, I’ll know for sure.

At some point, the front mudguard and toolbox door were chromed and the visible part of the horncasting polished. Maybe this was when it was sprayed Orange. It had a front crashbar fitted too.

The grey Dulux top coat started coming off in chunks when I jet sprayed it before sticking it in the garage

Late SX200 forks.

Good luck with the build It’s looks interesting.

https://rover.ebay.com/rover/0/0/0?mpre ... 3960230499

Any good?

dickie wrote:https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F273960230499

Any good?

It’s amazing what crap some folk will put on eBay. I’ll pass but, if you find one in pristine condition for a similar amount, feel free to give me a nod

Ah, was this the one Karlos had for sale recently?

Stripped. Other than the stand crossmember having snapped, which I already knew, rest of frame seems okay.

Having had the casing aqua blasted, I have started the engine build. Essentially, all I had at the start was the casing (a GP150 casing I have had for years but it was in good condition, and so, I decided to use it rather than find an SX150 7... casing), original barrel and head which actually came out of a 125 Special I bought many years back.

Here are a few pictures of where I am today.

Nice project to get on with Paul, looking forward to watching it develop.

gaz_powell wrote:Nice project to get on with Paul, looking forward to watching it develop.

It’s at times like this when you realise how many parts Lambretta’s have, Gaz, especially when starting from scratch. Another two small parts on order. Once I have them, I should be able to finish the bottom end.

The Uni Mag housing appears well made. I was able to push it on to the studs most of the way and then tIghten the nuts to get it on the last centimetre, or so. I have never had a Mag housing, I don’t think, that has not been a tight interference fit. I just hope it passes the leak down test when I get to that stage.

The last SX's were arguably the most sorted of the SIII's with touches that were engineered to apply to the GP, & probably the rarest of the type. An expert might confirm as to where they may have been assembled, though Spain may have come into play.

Sorry if you think I'm picky, but safety is paramount. The hub bearing nuts need to be shorter if the nyloc portion is to function. I can't recall where mine were obtained, but they are readily available, though if you struggle, let me know.....

Warkton Tornado No.1 wrote:The last SX's were arguably the most sorted of the SIII's with touches that were engineered to apply to the GP, & probably the rarest of the type. An expert might confirm as to where they may have been assembled, though Spain may have come into play.

Sorry if you think I'm picky, but safety is paramount. The hub bearing nuts need to be shorter if the nyloc portion is to function. I can't recall where mine were obtained, but they are readily available, though if you struggle, let me know.....

They are the only M6 nylons I had in. Only one of the four is not flush as the stud, for some reason, is sitting deeper. That one stud has a dab of loctite on, although there is a sizeable bit of plastic engaged with the stud thread

Surflex five plate fitted. Probably overkill for a Stage 4 175 but it all fitted together well.

Not a lot more I can do now until I get the top end back.

I had a battle with setting the chaincase up, both in terms of the clutch (clutch arm shafts of differing lengths and a brass thrust bush that needed a small file taking to it) and the kickstart shaft.

It appears that there are S3 kickstart springs that aren’t fit for purpose and also varying dimensions on GP kickstart shafts manufactured in different places. Also, the Uni chaincasing was ridiculously tight on the three shafts I tried. That aspect was only resolved with judicious use of wet n dry.

One tip is to buy a few shims for the shaft. All the ones I had were around 1.0 mm when I actually ended up needing one that was about 1.7. This meant that I only had to take a tiny bit off the shaft to ensure it didn’t catch on the top clutch plate.

Setting up the rear brake was relatively okay. I am trying Makino shoes for the first time. The shoes are glued on in, almost, the right positions and are thinner than Newfren ones which, too be honest, are often too thick. Whilst the hub is probably not precisely concentric, there seems to be good contact between a large part of the shoe and the hub.

However, I did have nnto take a file to the cam as that was in contact with the hub.

All in all, totally normal building experiences

Nice & clean

Will you be getting the crankcase cover blasted to match? I realise that it is brand new, but the main case does look very swish.....

Warkton Tornado No.1 wrote:Nice & clean

Will you be getting the crankcase cover blasted to match? I realise that it is brand new, but the main case does look very swish.....

I only ended up with a polished one as it was the only type that AF had in stock at the time. It won’t stay like that for long as I am not one of life’s great polishers and cleaners