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Old S3 Li150 bitsa - build up

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Old S3 Li150 bitsa - build up

Postby alex_hughes » Tue Aug 26, 2025 2:39 pm

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I'm going to record the build up of this old trooper. As much as anything, this is so that I keep up momentum. And its nice to have the thread for future reference.

The frame came from a famous supplier of NOS parts in WSM. It had clearly had a life. Supplier said it hadn't cost him much, his wife said he got it for nothing from an old guy who wanted it out of the way. But perhaps needless to say, I didn't get it for nothing. He said that the old guy raced it in the 70s and 80s and it went into his shed after a big off. Despite it being an Li150 it was fitted with TV headset so I'll continue with that look.

I got the frame fitted with some parts which I will re-use - the legshields, toolbox, back light mudguard etc. Frame was blasted and sent to Dean Stradling (good mate and highly recommended - a magician with metalwork) who straightened it - big job commensurate with the 'off' - replaced main crossmember and also added a Spanish style engine mount reinforcement. In the past couple of years I've seen three mates have their frames 'snap'. But from what I have seen the frame doesn't actually snap, it tears apart above the engine mount. The Spanish obviously recognised this is a weak link and designed the reinforcement. So now, as a matter of course, I have Dean fit them to my frames when they are on his jig. Peace of mind, innit?

The frame has been painted. Black under the bodywork as it was before. A grey/beige colour on the loop. I'm going to reuse the old panels etc, and what is missing will come out of my spares. What will it look like? Well everything is going to be different shades... but I'm hoping the melange will make the whole more than the parts... if it looks crap I'll paint it later but I want to get this on the road.

As with my TV 175 build the sub-assemblies are already done... forks built, engine built, headset built. Anyway, off we go.
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Re: Old S3 Li150 bitsa - build up

Postby nsaints » Tue Aug 26, 2025 3:28 pm

Great - I'm pleased a new thread is appearing on the forum
I shall follow this with interest, along with Tuesday night and the occasional coffee updates!

I was, whilst looking up information, on the 'old' Scooterotica forum lamenting how much we miss a very active scooter forum
Recently I needed some RT information, and had to subject myself to FB by reopening my dormant FB account which I really didn't want to do :(
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Re: Old S3 Li150 bitsa - build up

Postby Scooterslag » Tue Aug 26, 2025 3:54 pm

Looking forward to following this, I do like a bitsa build ;) just in the middle of something similar myself but don't want to start a new thread until I've got the painting done and starting the build proper. Paul ;)
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Re: Old S3 Li150 bitsa - build up

Postby dickie » Wed Aug 27, 2025 10:45 pm

Love a bitsa and I love a build story.
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Re: Old S3 Li150 bitsa - build up

Postby alex_hughes » Thu Aug 28, 2025 7:36 pm

A bit of time today so I thought I would add the items which are awkward to fit once the tank is in - seat catch, badge holder, rear light unit, rack, CDi mount.

The badge holder threads snapped off when I tried to get it off so drilled/tapped/loctited replacement threads into place. Plus a lock nut for over engineering purposes! I do have a spare badge holder but I think its good to re-use the original items where they can be saved.

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I put the flap back on over the petrol tank. I don't know why, I don't usually bother. Isn't it a left over from single seats?

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CDi mount, MB as usual because it pushes the regulator into a better position, wires are less likely to rub on mudguard.

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Engine in next.
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Re: Old S3 Li150 bitsa - build up

Postby Toddy » Thu Aug 28, 2025 9:51 pm

Love a thread like this , good luck with the build
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Re: Old S3 Li150 bitsa - build up

Postby alex_hughes » Fri Aug 29, 2025 8:17 pm

Spent the morning replacing a rear bearing seal in a mate's GP but still managed to do a bit.

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The eagle eyed might notice a TV175 badge on the back. I don't have anything else but in searching I found two spare TV175 badges. Clearly overordered on the last project.

Engine is a Spanish Jet casing with SIL 200 iron barrel, AF cassette clutch and Li150 box, CST clutch mechanism. 30mm open mouth carb and Ron Moss X-Box exhaust. I love this engine, I've done some very memorable rides on it including winning Gold (with Andy Nsaints) in the National Road Rally a few years back and also up to Fort William last year for the 5Nations. The only downside is that a naughty scooterboy cut the bump stop off in the eighties.

Hopefully get the forks/headset/brake on it next day or two.
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