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Series 3 TV 175

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Series 3 TV 175

Postby Storkfoot » Fri Jun 25, 2021 6:03 pm

Standard Series 3 TV 175 rebuild. Trying to keep as much of original engine as practicable. That said, I am treating it to a Vape DC static electronic ignition, bearings, seals, a new Conrod and NOS piston too.

It is still on the original 62mm bore and had the original white engine mounts too.

At some point in its Italian past it looks like legshields and front mudguard have been replaced, as has one of the side panels. Probably at this time, years ago, it received a blow over in white too.

Image
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Re: Series 3 TV 175

Postby Toddy » Sat Jun 26, 2021 12:38 pm

You have some projects on the go Paul ;) looks tidy that one
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Re: Series 3 TV 175

Postby Storkfoot » Sat Jun 26, 2021 2:10 pm

Toddy wrote:You have some projects on the go Paul ;) looks tidy that one


Sold a Vespa and couldn’t resist this :shock:
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Re: Series 3 TV 175

Postby Toddy » Sat Jun 26, 2021 2:11 pm

Storkfoot wrote:
Toddy wrote:You have some projects on the go Paul ;) looks tidy that one


Sold a Vespa and couldn’t resist this :shock:


Good swap :lol: :lol:
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Re: Series 3 TV 175

Postby dickie » Sat Jun 26, 2021 6:58 pm

I know there are mixed opinions on this, but for me, this is the holy grail of lambrettas.
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Re: Series 3 TV 175

Postby Scooterslag » Sat Jun 26, 2021 7:53 pm

dickie wrote:I know there are mixed opinions on this, but for me, this is the holy grail of lambrettas.


You're not wrong there, IMO always thought the TV175 S3 is a better machine than the TV200 and the engine is probably one of the best ever made by innocenti. The just ride so well and everything is just 'right' if you know what I mean.
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Re: Series 3 TV 175

Postby Storkfoot » Sat Jun 26, 2021 8:19 pm

Image

This is why I am keeping it standard, other than electronic ignition.

The engine build hit a snag today when the piston popped out of the cylinder. Further investigation revealed that that NOS Borgo 62.0 mm piston is actually a conversion piston.
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Re: Series 3 TV 175

Postby coaster » Sun Jun 27, 2021 9:44 am

Storkfoot wrote:.....The engine build hit a snag today when the piston popped out of the cylinder. Further investigation revealed that that NOS Borgo 62.0 mm piston is actually a conversion piston.


How worn is the original Piston? just wondering if a light clean up and useing the rings off the conversion piston would work?

Re the white engine mounts, do you mean the old style mounts with the short bolt? My old TV175 had those and I know it was a while ago (1981 ish) but I recall that it vibrated a fair bit.......whish I still had it, sold for £125 :? :roll:
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Re: Series 3 TV 175

Postby Storkfoot » Sun Jun 27, 2021 12:48 pm

Piston looks to me like it has had a four point seize, cleaned up and then seized again. I think I’ll get a GOL or Mahle replacement.

These are the engine mounts. Seem to be stamped “CF”

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Re: Series 3 TV 175

Postby coaster » Sun Jun 27, 2021 2:07 pm

Storkfoot wrote:Piston looks to me like it has had a four point seize, cleaned up and then seized again. I think I’ll get a GOL or Mahle replacement.

These are the engine mounts. Seem to be stamped “CF”

Image


Ah right, all the TV's I had 1 x175 and a 200 had the early narrow mounts.
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Re: Series 3 TV 175

Postby ToBoldlyGo » Sun Jun 27, 2021 9:57 pm

Storkfoot wrote:Image

This is why I am keeping it standard, other than electronic ignition.

The engine build hit a snag today when the piston popped out of the cylinder. Further investigation revealed that that NOS Borgo 62.0 mm piston is actually a conversion piston.


Mr Storkfoot. A man of your calibre should have spotted that. :lol:
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Re: Series 3 TV 175

Postby Storkfoot » Sun Jun 27, 2021 10:25 pm

The thud of the piston hitting the cylinder head was all I needed to know something was up :P
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Re: Series 3 TV 175

Postby vegansydney » Sun Jul 04, 2021 9:03 pm

Nice score. I'm a little jealous. I'll be watching this thread with interest.

Regarding the pistons, I recently discovered that Meteor had begun manufacturing 125/150/175 and 200cc Lambretta pistons with 1mm rings under their 'vintage racing' line. Unfortunately the 62mm piston they currently make has a 39mm compression height, so it's a 'conversion' piston. Extremely disappointing to say the least. It would be great to have quality, thin ring TV pistons in production.

I've built two TV Series 3 engines (mid-'63 and an early '64) over the course of the pandemic and both came with white engine mounts.
Image

dickie wrote:I know there are mixed opinions on this, but for me, this is the holy grail of lambrettas.


Couldn't agree more. IMHO the TV/3 (especially the early versions) are the pinnacle of Innocenti design.
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Re: Series 3 TV 175

Postby Warkton Tornado No.1 » Mon Jul 05, 2021 11:14 am

Storkfoot wrote:Image

This is why I am keeping it standard, other than electronic ignition.

The engine build hit a snag today when the piston popped out of the cylinder. Further investigation revealed that that NOS Borgo 62.0 mm piston is actually a conversion piston.


The TV175 top end geometry is why they are inherently smooth running.

From the perspective of maintaining such a delightful trait, but with more contemporary standards, I would look into the feasibility of a thin ring piston that could be adapted to suit the 116 mm conrod, even with a base packer.

It may be that the 'conversion' piston is the only Lambretta specific item to fit readily, but I would still trawl the knowledge base (Grampian etc) for a piston that could be utilised. Chances are that a non Lambretta piston will be stronger, need only two thin rings & be able to endure some fettling to reduce weight.....
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Re: Series 3 TV 175

Postby Storkfoot » Tue Jul 06, 2021 11:59 am

For the time being I have fitted a Mahle piston. I’ll see how that goes.
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Re: Series 3 TV 175

Postby Cgt75b » Thu Jul 08, 2021 4:01 pm

Lovely TV Paul, good luck with the build. I have a few top ends if you need anything pal.
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Re: Series 3 TV 175

Postby Storkfoot » Thu Jul 08, 2021 8:21 pm

Cgt75b wrote:Lovely TV Paul, good luck with the build. I have a few top ends if you need anything pal.


Thanks, Paddy :D :)
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