hi all, ive just picked up a tidy gsxr400 gk73a model. its nice and tidy and im well chuffed overall.

only problem is it had been stood for some time. the carbs have been cleaned and the bike will..... eventually start!

if some easy start is sprayed in the back of the carbs it fires up straight away. is this the dreaded o-ring issue? if so where do i buy some from?

otherwise cant wait to rack up some miles on her

first thing I would check is if the fuel vacuum tap is working correctly. After that check for air leaks, and I guess from there, the O-rings in the carb. but to be honest its not a big job, there is even a "how-to" on youtube specifically for gsxr400 carbs.