Hello fine people of the internet I am having an issue with 2001 F4i it will start cold and rev up until it warms up where then it will idle down until until it stalls and will not start again. I do own another F4i it’s an 04 but I don’t have this issue. The 01 has gas and has ran well in the past any advice is welcome.

 

It was the fuel pump installed a new one bike now starts and stays running but not well I’m searching for a vacuum leak I hope otherwise it’s the mass air flow sensor. It also has the the single loudest clutch basket ticks under 1000 rpm I think I’ve ever heard.