K6 GSXR750 won't idle.
~27k miles.
Owned for 20 years.
Never laid down.
This morning I started the bike and it idled for a few seconds and then died.
Gave it some throttle and it would start and seemed to rev OK, but as soon as I let off the throttle, it would die. To get it to start again, had to give it at least 1/4 twist.
I thought air filter might be plugged (happened once before), but that wasn't it. Even with no air filter, still struggles.
I filled the tank earlier this week and have put about 35 miles since. I was originally thinking bad gas, but maybe not. I'll probably drain the tank anyway and try some fresh fuel.
It smells rich, or at least very stinky.
I checked battery voltage when it was running at about 4k rpm, it was sitting a little above 14v.
A few times this summer, when cold starting, it seemed inconsistent. Sometimes it would idle a little low, but never died.
No FI light.
I haven't had a chance to look at it too much other than the air filter and voltage.
We're getting towards end of riding season in MN, but would like to figure it out before winter storage.
Some things I plan to check.
Fresh fuel as mentioned.
Fuel flow test
Vacuum hoses.
Plugs (only about 7k miles on them)
Thoughts?