how do they get AFR readings on a Dyno

[Guest]

simply when you take your bike to be dynoed ,how and where do they get the AFR reading
from.
please dont say from the 4 screws the carbs are balanced from.

[posplayr]

probably a tail pipe O2 sniffer, unless you have a bung welded into your exhaust pipe for the O2 sensor

[Guest]

ok thanks that.
my Gs1085s has been off the road for last 3months ,i will exsplain it will not run over 5500rpm.
its been to 3 bike dealers which have had the carbs a part cleaned stripped on 3 times
we tried 4 sets of plugs 2 sets of carbs been reshimmed every thing been checked spent a fortune and tonight i get a phone call 2 of the screws which you balance carbs with have vanished .
it was running fine till i had it dyoed then took it of the road for the winter.
would that be the problem.
cant believe we did notice sooner.

[SqDancerLynn1]

Missing screws would definitely cause a problem