[How2]

Hi


I re-tighten the exhaust headers as some bikes run lean with a leak at the exhaust valve
(early honda xls will do this) will suck air through a header/ seal gap. That did not solve this particular situation. None of my KZs or GPZs do that but check yours ,this may be a quirk for the 250s

Adjusting the valves did not resolve the problem either.

I pulled the carbs for the 4th (maybe 5th time) and reinspected everything with a completed strip down.

The clutch side float bowl was 18mm height and the throttle side was 16mm.

As the book says bowls should be 17mm with a + or - 2mm range, I set them both at 18 mm. I am skeptical that this will fix the problem, but I haven't done the test ride. Its too damn cold right now.

My only other guess is that there is a leak in the airbox somewhere

I am definitely not a newbie and this thing really is a pain.

Do keep the thread going.