I have some diagrams, wich did you need injection - abs -.....
I tried to add the attachment but it did not work, maybe better by mail or I can upload to my site

Before I started testing the ignition I did a compression test and leak down - TPS set ok - balanced the carbs .
Only the number 2 sparkplug cap was faulti.
A colleage said the pre ignition seemed a bit irregular with the throttle beeing s steady making the the CDI suspect

It has been about 7 years since I ues the scope, so I am verry rusty. I have a motorcycle Yamaha TRX850 here, parralel twin with 2 carburettors 2 coils. First problem was sometimes the bike hesitated at around 1800 rpm when turning the throttle slowly and would not go higher, when turning it fast it...