LCGB Forums

Ive a Serveta SX 200 Motoplat ignition.

Got no lights and looking to ts1 it.
whats my ignition lights options?

With a TS1 your Motoplat needs to be history......

so,
crank
stator
flywheel
loom
rectifier
CDI
its got no indicators so gear and throttle switches ?

Scooterlam wrote:so,
crank
stator
flywheel
loom
rectifier
CDI
its got no indicators so gear and throttle switches ?

You can keep the original handle bars switches easy enough. I have retained them on my Jet, but a new loom and ignition makes like life so much easier.

Post by Digger » Sun Nov 13, 2016 7:40 pm

With a TS1 your Motoplat needs to be history......

The recommendation for a GP crank seems reasonable, though I've never witnessed a failed Li taper crank.

However, excuse my ignorance, but, having converted internal rotor Motoplats to take GP flywheel centres, I wonder how difficult it can be to do the same to the Serveta flywheel.

With later modifications to race rotors, all I did was bore the taper on a lathe & file the key-way by hand.

It seems to me that for little cost & a bit of trial & error you could have an excellent ignition & power generator rather than follow the trend...

Warkton Tornado No.1 wrote:
The recommendation for a GP crank seems reasonable, though I've never witnessed a failed Li taper crank.

Really?

Post by Digger » Mon Nov 14, 2016 5:15 pm

Warkton Tornado No.1 wrote:

The recommendation for a GP crank seems reasonable, though I've never witnessed a failed Li taper crank.


Really?

Yes. Really. I don't think you mean to question my integrity, but you have commented before on my responses....

Your point is not lost on me, but, like the recent controversial issue of lay-shafts, I haven't had one of those fail either.

I think I ride fairly hard & I've certainly made my share of cock-ups. You surely know yourself that racing takes no prisoners.

However, none of the flywheels, or hubs for that matter, that I've assembled have come loose, on road or track.

If you can state without any doubt that the sheared crankshaft you depict was yours from new & you know it's history, then your own comment has some genuine validity.

Mark

I have also had a li crank shear. No i hadnt had it from new and neither have a had this bike from new, so logic suggests changing the crank might be prudent.
I havent explored the lack of lights but i dont understand the motoplat ignition.
So a bit like 30mm dellies; its the devil i know.
Any explanation of the working s of motoplat would be appreciated.
At the moment its running a West coast lambreta lump
Which if i can sort out the lights i would like to run before
Deciding if it needs a TS.

Seen too many of these tapers fail.

Adam

Adam
Are the lighting couls the same as dc stators
Ive lost my book]

What are we on about here? Motoplat points stator coils?

It all depends what Motoplat stator you have. From memory, some of the 12v Motoplat points stators (and the Motoplat electronic) have 2 yellows coming off them, which allow you to use both to a rectifier for DC, or to take one to earth for AC... in a similar way that people convert 12V AC electronic for DC use.

This link details how some in the USA are reworking the stator from 12V DC to 12V AC but it does show how the 2 x yellow configuration works...

http://www.lambrettaclubusa.net/forums/ ... -to-redux/



Strangely, the stator could have been left alone, simply taking the one end to earth externally, rather than converting without the option to revert without further reworking.


Adam

Warkton Tornado No.1 wrote:

Post by Digger » Mon Nov 14, 2016 5:15 pm

Warkton Tornado No.1 wrote:

The recommendation for a GP crank seems reasonable, though I've never witnessed a failed Li taper crank.


Really?

Yes. Really. I don't think you mean to question my integrity, but you have commented before on my responses....

Your point is not lost on me, but, like the recent controversial issue of lay-shafts, I haven't had one of those fail either.

I think I ride fairly hard & I've certainly made my share of cock-ups. You surely know yourself that racing takes no prisoners.

However, none of the flywheels, or hubs for that matter, that I've assembled have come loose, on road or track.

If you can state without any doubt that the sheared crankshaft you depict was yours from new & you know it's history, then your own comment has some genuine validity.

Mark

It's an LI/SX crank that's failed - whether it's mine or not isn't relevant as far as I'm concerned, I was just responding to your statement that you've never witnessed one.

my lynx had a tuned 225 barrel and managed to sheer the std crank at about 75 mph

Just to clarify, I have no issue with the advocating of GP200 larger crank tapers with an optimised engine.

Despite owning both ‘tuned’ TV200 & SX200s, each with standard cranks, I have never experienced a sheared crankshaft taper.

Similarly, many racers besides me utilised the LiS crank during the 70’s early 80’s because it was easier @ the time to pad for increased crankcase compression. In most instances, the flywheels were not full weight.

However, again, I have never experienced or witnessed a sheared crankshaft taper. Nor did I hear of one occurring during those times.

Whether elaborating on such an apparently 'rare' experience as mine makes it more believable, I don’t know.

Finally, despite the difficulty there may be in coming to terms with the above, I would not choose to build a tuned engine of any decent standard with a full weight flywheel utilising an LiS type crank taper.

FFS can certain people stop F@@king up every thread with petty, point scoring ego inflating, overtechnical statements which have fook all to do with the question asked.
If you can help me understand motoplat ignition please post away. IF NOT PLEASE TAKE YOUR ONE HAND TYPED POSTS ELSEWHERE. YOUR NOT HELPING

And breath.

Oh and thanks Adam.

So the Motoplat is a points triggered system
Which has a different looking coil.
It runs DC in the same way as a wassel but can be un wasseled and somehow its better.

Derek , do you have the point motoplat or the electronic ?

5 pin rectifier, and red coil thing.