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Tune or Replace?

Technical help for Series one, two and three Lambrettas. Models include the Li, Li Special, TV, SX, GP, Serveta and API/SIL models

Re: Tune or Replace?

Postby Adam_Winstone » Fri Feb 14, 2025 4:47 pm

If you do go for the sport seat, small rear sprint rack and a legshield spare wheel carrier then the are a couple of things to watch out for:

Rear rack and seat - Many sloping seats will come back far enough to interfere with each other. You 100% can get combinations that fit but others will not! Make sure that the ones you go for do.

Legshield spare wheel carrier - Note that some simply bolt to the lower horncasting + mudguard fixing locations, which can easily strip the soft alloy threads out of the horncasting (vibration and poor support). However, others also have hooks that locate over the top of the legshield beading, which better supports the weight of the wheel, so avoiding damage to the horncasting threads.

There are lots of other options to personalise as you choose but wanted to highlight these so that you're aware.
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Re: Tune or Replace?

Postby Storkfoot » Fri Feb 14, 2025 4:59 pm

Glad you’re enjoying your GP, Mark.

Do some research before you go tubeless. 10” wheel rims and tubeless tyres are hard work. I tried and gave up. I justify my decision, to a degree, by believing that riding anywhere on old technology machinery is a significant risk.

Seats. If you have any lower back issues, stick with a standard seat. That said, I am of an age were comfort is more important than looks. One of my personal hates are those slope back seats that end short of the rear frame grill. I love the look of a Snetterton and used them for years. As soon as I stopped using one, my back issues improved no end.
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Re: Tune or Replace?

Postby LambrettaMarky » Fri Feb 14, 2025 5:52 pm

Thanks Gents

Maybe I'll just try a sit on some options then as mine is really quite hard.. Good points about compatibility too.

I don't carry a spare wheel on any of my other bikes and raced enduro for years, so changing a tube is not issue - I just thought tubeless was an improvement??

Is there such a thing as a Mousse for our little wheels like the off road bikes have: https://www.24mx.co.uk/product/michelin ... PM-0001634

On my adventure bike I carry a puncture kit and compressor, but then I have no battery on the GP. Mind you quite how I'd get the front wheel off on the road side is another thing altogether, so if I get a flat I hope it's in the rear!
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Re: Tune or Replace?

Postby gaz_powell » Fri Feb 14, 2025 7:16 pm

Im still a lover of split rims as I don't have to rely on anyone with them
My philosophy always has been ;
good split rims, correct tubes and good tyres.
Correct pressures and don't overload
Change tubes when I change tyres (frequently on back) or every 2yrs on front (yes I have loads of removed ones !!!)
Carry a spare wheel always (or at least a tube and pump)

The spare wheel gets you back up and running quickly which is important to me

Seats
...."I am of an age were comfort is more important than looks. One of my personal hates are those slope back seats that end short of the rear frame grill. I love the look of a Snetterton and used them for years. As soon as I stopped using one, my back issues improved no end."

wise words...thought ive just fitted an Andy Nixon Snet, but with a T piece (for comfort !!!)
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Re: Tune or Replace?

Postby LambrettaMarky » Sat Feb 15, 2025 10:28 am

What is deemed to be the go to tyre for the GP?

I'll speak to Cam Lam about the quality of my split rims & check the tubes too - probably Indian.

Thx
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Re: Tune or Replace?

Postby martyn dwane » Mon Feb 17, 2025 12:22 pm

you could always go "split tubeless"
https://ve-uk.com/product/gori-split-tu ... ies-1-2-3/
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Re: Tune or Replace?

Postby LambrettaMarky » Mon Feb 17, 2025 3:55 pm

martyn dwane wrote:you could always go "split tubeless"
https://ve-uk.com/product/gori-split-tu ... ies-1-2-3/


Interesting - Thank you.

These are either the best or worst of both options I guess.

I can see these would be easier to fit a tyre to & to replace one, but other than that a good chance they'll not hold pressure?
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Re: Tune or Replace?

Postby Warkton Tornado No.1 » Mon Feb 17, 2025 5:54 pm

My opinion is that for racing/extremely hard road riding, tubeless is the automatic choice. Whilst I would not use ‘non centreing’ tubeless rims, many people do. I bought into SIP rims years ago, but the tubeless split rims now available appear to be a good product.

However, for as complete a scenario as I can give, the top racer Charlie persevered with split alloy rims which he would have procured via your friends CamLam. They are a lovely product & if fitted properly by somebody with your obvious competence should be relatively safe, even in the event of a puncture. I reckon that a Lambretta will normally be controllable to get to the side of the road in the event of air loss as they don’t have a tendency for the tyre to go all out of shape. So, despite what I have said above, my road SX still has OEM rims fitted with the correct tubes. If that appears to be a contradiction, I apologise, but I just haven’t got around to changing the format, even though I have a set of Ressurection Scooter split alloy rims earmarked for the bike. Not enough hours in the day….. :roll:

Before the tubeless rims were allowed in racing, I looked at what the bikers do that had to race using their OEM wheels. They went tubeless by sealing up all the spoke holes with - I think - a silicone type sealant. Despite having no beads to stop the tyre wandering in the event of a puncture, such tubeless set-ups were safer as tube-to-tyre creep/heat build up was eliminated. So, there is yet another option & something I would have implemented had the SIP rims not become available at a good discount to me :idea:

Finally, for complete ‘completeness’ be aware that the alloy tubeless rims do tend to be offset due to their design, so they ideally should be used in pairs. Ha! Would any variance in offset of a machine with scaffold tubing & a swinging engine as rear suspension be noticeable by the rider, I am unaware :lol:
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Re: Tune or Replace?

Postby LambrettaMarky » Mon Feb 17, 2025 10:05 pm

Interesting. I don't do anything racy or hard with the GP, just potter along. I'll speak to Cam Lam at some point...

Cheers.
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