TT600.. These things are a pain in the arse even when they're perfect.

I sold my TT600RE because it literally could not be fixed. It was broken from new. They were thrown together by Yamaha with mis-matched parts and never ran right.

The float height on these bikes is CRUCIAL. They flood very easily and won't start if the level isn't perfect too.

Yours will start with the choke though. HOORAAAHH. Your problems aren't that bad.

I would also follow the advice here and start with your pilot circuit and idle settings.

The bike has been sitting for 12 years. You say you cleaned the carb. I've read a MILLION threads and had a thousand customers who say "I've cleaned the carb and it still won't run".

You haven't cleaned a carb unless you've stripped it down to it's individual components. Every air way, fuel way, o-ring and spring. Ideally you want to soak it in solvent in an ultra-sonic bath and then use compressed air with a fine adaptor to blow out all the passages. Then you want new o-rings, new gaskets and then set up the carb to the factory settings.

My advice is to get some brake cleaner or 'Power start and spray a very fine mix into the air box and kick start it. If the electrics and compression are fine then it will burst into life and rev it's tits off for as long as you keep spraying. Don't do this for more than a few seconds though.

It is totally possible that your problems are electronic too. Do you have a strong and consistent spark ?

Ted
MotoRevive.

__________________
Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.