Bandit 600 1998 problem

[kitchenman]

Hi, anyone out there know about Bandits, mine has what I think it a choke problem
My bandit ran different to others round here on choke, slowly dies like it was flooded but others of a similar age rev around 4K
Now the weather is cold it will not run at all, starts coughs a bit then stops, get a bit better every time as it get warmer

It has been suggested it is a spark problem plugs were fitted new when I bought it 500 miles ago in May
The spark looks feeble but I only have car sparks to compare with, all 4 sparks are similar so unlikely to be both coils unwell
Spark will stretch out to about 6mm or so

Carbs were stripped and jets cleaned to get it started in May, it had not run for ten years and carbs were well varnished and all main jets clogged.

I started Ok in May and ran well BUT as the weather got colder it became hard to start, but was AOK when warmed up

HELP

ps I may try warming the head with electric blow gun to prove it is temperature related but will wait for a reply first.