classic motorcycle forum

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.

Wet plugs  ?

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

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

I want to do the tractor tank just in case there are some holes still waiting to be discovered. Both the bike tanks are sound, I didn’t realise it was just the fact that ethanol attracted water which caused the problems. So I shan’t do anything with them.

Fuel tanks aren't destroyed by ethanol. They rust out far more quickly is all. Ethanol is hygroscopic, water loves it. Water accumulates at the bottom of the tank to rust it out far more quickly than it used to in pre ethanol days. Of course the fact that newer tanks are made of a lighter gauge material than older tanks and therefore rust through more quickly anyway doesn't help either.  The major problem with bikes is too many people don't actually use their bikes but let them sit for long periods and then moan when they don't run properly on the odd occasion they're dragged out. Frequent use with fresh petrol continually flowing through the system is much better than letting the bike sit.

I can't see why you would line a diesel fuel tank. No ethanol content in diesel is there but you can have the standard problem of water condensate in the fuel if the thing is left idle for weeks at a time. That is why you often find on heavy equipment a decent cup sized indentation with a drain tap on the bottom of the tank so you can drain out the condensate before it gives any bother. It's just a standard maintenance thing which most owners either don't bother with or don't understand the reasons for. It's a self inflicted problem.

Just try riding your bikes before faffing about with tank liners. It's an uncommon way of preventing trouble but it seems to work.

Cheers,