random hesitation

[MekaniX]

1981 gs 400l
all stock, all clean

hesitates around 3500-5000

feels like a fouled plug , ( both are new and gaped right)

sometimes it will recover and pull strong but most of the time it will just sputter and surge

Engine and ignition are fine , 163/160psi compression

it will start on choke now but will only idle up for about 10 seconds and then dies, i know it should just keep reving

Plugs are both clean/tan

air fuel is set right on,

air filter is new and clean,

above 7000 its strong

Almost feels like its starving , but it even hesitates on prime,,,

anyone have any ideas ?

[spyderrocs]

flat spot in the carb?

[Doctor Shifty]

Plug boots could be gone. If they are old, replace them.

Kim

[tconroy]

are the carb slides working properly. Have you checked your battery.Get the multimeter out and do a test,it could very well be dirty wiring or coil problem.

[MekaniX]

turns out it was just crud in the carbs , after a good cleaning soaking, they finaly came clean.

bike runs good now.