classic motorcycle forum

Motorcycle Discussions => British Bikes => Topic started by: JohnnyT on January 29, 2019, 10:12:20 AM

Title: Auto advance
Post by: JohnnyT on January 29, 2019, 10:12:20 AM

Having trouble firing up my Tigress.Ive got good spark and wet plugs,but only getting the occaisonal pop.Could the auto advance which looks standard Triumph effect starting,or does it come in later ? The scooter was standing for many years and I cleaned the auto advance up,but it could be a little stiff.

Title: Re: Auto advance
Post by: john.k on January 29, 2019, 10:52:27 AM

Its likely a new capacitor is needed...........the spark may not be as strong as you think.

Title: Re: Auto advance
Post by: TGR90B on January 29, 2019, 06:05:47 PM

Good tip, but if it's been standing many years I'd strip the carb, especially as you say you've got a good spark. Fresh fuel goes without saying.

Title: Re: Auto advance
Post by: R on January 29, 2019, 09:55:09 PM

Wet plugs  ?

Always worth trying new plugs when that happens,
especially after standing for years....

Title: Re: Auto advance
Post by: JohnnyT on January 30, 2019, 10:14:07 AM

I have new carb and plugs.With wet plugs I know fuel is getting through.Do you mean condenser John K? The manual says 5 dg btdc for points opening used to being 17 ish on my 2 stroke Lambrettas.Is there such a difference on 4 strokes?

Title: Re: Auto advance
Post by: iansoady on January 30, 2019, 10:59:55 AM

That advance figure is probably for full retard. It's usually better to time on full advance as that's where the engine spends most of its time. But if that's the only figure you've got then that's what you'll have to use.

Capacitor is the modern name for condenser. They're cheap enough and always worth replacing.

Title: Re: Auto advance
Post by: Rex on January 30, 2019, 04:19:38 PM

If it's been lying dormant for years then you're going to have to go through the fuel and ignition systems thoroughly to see what's what and rectify any faults.
There's really not much point in asking for remedies on the Net as it could be costly and take for ever to fix. As regards the ATD even if it was seized it wouldn't stop the bike from starting..the timing would just be stuck at full retard, which is what you want when starting anyway.

Title: Re: Auto advance
Post by: Oggers on January 30, 2019, 04:35:33 PM

Heating up the plug(s) beforehand sometimes works - plus spraying petrol directly into the carb just beore starting....

Title: Re: Auto advance
Post by: iansoady on January 31, 2019, 11:43:22 AM

Or Easy Start. If it fires on that then the problem isn't ignition.

(https://proxy.duckduckgo.com/iu/?u=https%3A%2F%2Fwww.workshopping.co.uk%2Fmedia%2Fprod_images_nodel%2FPDS04.jpg&f=1)