Hey all,
Currently on a loooooong trip (several weeks) on my 78 750 Supersport. A couple days ago I started having an issue where the bike would bog down lose power, and occasionally surge back to life around 45mph. A twist of the wrist and it would be up and moving again but staying around that 45mph mark was just a chore. Choke would clear the issue up, unless of course I had to come to a stop, at which point the bike would die if choke was still on.
In the past few days I've tried pulling the carbs (several times) and each time found the jets clean as a whistle. I've tried cleaning and re-oiling the pod filters as well. Inline filter and internal tank filters looked great and flowed well. I did also back off the fuel mixture screws about half a turn to see if that would help. It didn't. For half of one day the issue was resolved by duct tape over the outer two pods and keeping my knees tucked close to the pods.
However, the problem has not gone away and is on fact a bit worse now. Instead of surging, the bike just wants to bog to zero power. And the dead range is now from 45 to about 65 mph. It happens in both 4th and 5th gear, I'd guess around 1/4 throttle maybe?
I've descended in elevation about 700 feet from where the bike was jetted (and ran pretty darn good), but I feel like that shouldnt be enough to cause problems.
I'm debating just bringing it to a shop in the city I'm in now (Austin, T ), but don't really wanna drop the cash and lose a day of riding. So any suggestions would be much appreciated!
