Hi all,
After working for hours on the R90S engine, I started having the issue that one cylinder fires perfectly and the other misses 90% of the time.
It does it with fresh batteries and new plugs.
What I noticed is while the engine is running if I take the plug out of the good clyinder، the other one picks up and fires much better, if the faulty cylinder plug is disconnected the other cylinder continues working fine.
Is this am issue with CDI unit ? I haven't changed the hall sensor postion.