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Minefield

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

Minefield

Postby lou » Fri Sep 17, 2021 8:10 pm

Hi All .. after your thoughts

Standard TS1 ran for years always been reliable. After crank break down, fitted new crank , piston and rings , new bearings all the usual while in there . Squish 1.2 good compression ratio , timing set 17’ , air leak tested .

But just won’t run right , almost like 4 stroking , spluttering at 55/60 , it’s the same jetting, so tried few combinations from previous years which made no difference!

Engine out again !! checked over everything , just not the same bike, at bit lose end what try next !.
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Re: Minefield

Postby MickYork » Fri Sep 17, 2021 8:19 pm

What's the engine spec' ? ignition, carb', exhaust, etc.

If it's a TMX carb i had issues with the fixed atomizer and had to fit a larger needle and re-jet
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Re: Minefield

Postby lou » Fri Sep 17, 2021 8:36 pm

It’s all as it was before: nothings changed … Running VHSH 30 .. tried different atomiser needles from previous as stated
It’s Bizzare … next move possibly try new slide !
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Re: Minefield

Postby coaster » Sat Sep 18, 2021 10:30 am

Good idea to check your pickup hieght, could have changed with the crank replacement
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Re: Minefield

Postby Lockman69 » Sat Sep 18, 2021 1:54 pm

Maybe….when it was originally set you had a minor air leak that you didn’t know about and it was over jetted to compensate, now it been sealed better you need to re-jet ?
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Re: Minefield

Postby nickw » Sun Sep 19, 2021 11:23 am

Had you thought about the carb itself being worn? You have said the scoot has done many miles. I had a similar problem (as we always say) and after many different things changed/tried a new carb fitted and problem sorted.
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Re: Minefield

Postby missing lynx » Sun Sep 19, 2021 11:30 am

Have you checked your timing marks still line up after fitting the new crank?
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Re: Minefield

Postby lou » Sun Sep 19, 2021 11:59 am

Thanks .. I’ll have another go see what’s happening, check few things mentioned
Pick up height be good shout,
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Re: Minefield

Postby lou » Sun Sep 26, 2021 3:09 pm

Right ok .. seemed to be ignition which is strange as it was new stator, changed it now runs better !
However now sitting at 1/4 to half throttle like it’s fourstroking .. hold it at half throttle while it gain speeds it clears
Something seems not right . I’m nervous to go any leaner TS1 on DQ264 with k21 top clip vhsh Nk road.
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Re: Minefield

Postby ROClarke » Tue Sep 28, 2021 9:44 am

lou wrote:Right ok .. seemed to be ignition which is strange as it was new stator, changed it now runs better !
However now sitting at 1/4 to half throttle like it’s fourstroking .. hold it at half throttle while it gain speeds it clears
Something seems not right . I’m nervous to go any leaner TS1 on DQ264 with k21 top clip vhsh Nk road.

Personally I would check your head gasket if you are running one
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Re: Minefield

Postby lou » Thu Sep 30, 2021 11:36 pm

[quote][Personally I would check your head gasket if you are running one/quote]

No not running a head gasket ...
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Re: Minefield

Postby coaster » Fri Oct 01, 2021 9:02 am

lou wrote:
[Personally I would check your head gasket if you are running one/quote]

No not running a head gasket ...


Heads can still leak without a gasket, I had this on my TS1 on a ride to a rally a few years ago, engine started getting boggy mid throttle so checked plug when I got there and sure enouggh the plug was black and sooty. I lowered the needle and it improved a lot but on the ride back it blew a hole in the piston :shock: It was obvious when I looked closer as the re were oily deposits around the head/cylinder joint :roll:
Its possible to compensate for small leaks without knowing when setting your jetting which is why doing a leak down test is vital. It would be a good idea to do one before doing anything else as you could be cjasing your tail :?
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