how can i to increase maximum spark duration time

[nnffssaa]

my ride is 100CC 4stroke ATV
i have some question hope everyone can help me
Today i use pico to find out misfire.
but i saw some wrong with my spark duration
my spark duration just 380 uS
and i tried to modify dwell time , but spark duration not apparent change.
how can i to fix this problem ~and thx for all

and thx for all


*in the that figure yellow is Primary Ignition
red is rpm
blue is Secondary Ignition

[nnffssaa]

yellow is Secondary Ignition
red is Primary Ignition
blue is rpm

[Matt Cramer]

That isn't all that unusual for an actual spark duration. The "max spark duration" in the settings is more of an anti-dwell, how much time it takes the coil to recover before you start charging again.

[nnffssaa]

i set dwell time is 3.5ms,and maximum spark duration time :2.0ms
and what factor also can be affected spark duration?
i'm very confuse with that
and also upload my datalog
thx for help
**
red is mean primary spark
yellow is mean second spark