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Just rebuilt my engine to original spec including stator/battery/coil & voltage regulator.

Intial start up was fine and ran smooth but after leaving scooter overnight it ran lumpy than nothing?

Checked timing, checked carb, and there is a spark at the plug.

Does the the ignition need the battery charged to work?

Any help appreciated?

Trying to set off for I.O.W

Hiya, you getting fuel through? checked the plug etc, if not blocked carb/ fuel tap problems. You don't need a charged battery to start the engine- it just powers the horn/brake light/parking light if its a 6v DC set up. Cheers Paul

Yeah plug has spark. Also checked points/timing?

I hate to say it, but have you done a leak down test since the starting issue?

The other things to check would be the condenser & plug cap, which should preferably be unsuppressed.

Yes leak down test was all good.
New condenser and plug cap unsuppressed.

Littlewheels wrote:Yeah plug has spark. Also checked points/timing?

No I meant is the spark plug wet with fuel/ flooded or dry from poor fuel flow or no fuel.

try starting with air hose off the carb.
is there a smell of fuel?

If you’ve done the ‘finger test’ with the HT lead & your hair’s still on end, presumably you’ve got very good earths.

Have you got another flywheel to try with a good matching taper?

Do any lambretta owners still have hair?

dickie wrote:Do any lambretta owners still have hair?

Not us old farts

dickie wrote:Do any lambretta owners still have hair?

Ears & nostrils in abundance…..

Hopefully, the lack of update from Littlewheels is indicative of him getting to IOW and having a blast since he arrived.

Possibly a sheared woodruff key?

Any updates on this issue, was it resolved? And if so how.?

Firstly sorry for the delayed reply but didn't return from IOW until yesterday - on the train!

Looked for advice at the rally and after fully charging the battery the scooter started first kick however after 5 mins running it started to get lumpy then cut out.

Tried again but without lights and ran ok until I turned ignition key back to lights on?

Must be a stator plate issue or the voltage regulator so going to look at those tomorrow.

I suggested trying another flywheel but understand that was probably not possible. However, the magnetism might well be down on what it should be….

OK so replaced the voltage regulator & still the same - started, ran lumpy then turned ignition key to lights and she died

I have now removed the stator and will swap it with another I have on another engine however I can't help thinking that the replacement may be faulty too so does anyone know who could test & repair this one? I phoned Anthony at Scootronics & he no longer does repairs only product/part sales.

Thanks

is it a 4-pole or 6-pole bud?
I've stators & flywheels you can have

Have you checked and rechecked your wiring to the wiring diagram? I am no auto electrician but this sounds very much like something is wrong in your headset causing the ignition to short out when you activate the lights.

I have found those early ‘60s looms to be a bit of a head scratcher before now. The rear brake light switch blowing and cutting the ignition was a particular high point in my Lambretta education.

Yes it's a 6 pole Ducati.

Good point with respect to checking the wiring. I am sure I would have checked last time I worked on the headset but I will look anyway.