I believe that some of the systems to reduce engine braking vent some of the crankcase pressure back into the intake side of the motor.There is info on the internet as there are aftermarket products available for high performance street motorcycles.
I think an LED light would give you lots of light without taxing the magneto too much. I think 55w could be an issue with the magneto lighting windings.
I am guessing that the bikes that had an engine breather tube going into the air box were 4 stroke bikes. On this bike this is a gearbox breather and only needs to be vented to the atmosphere. I like to cut the ends of these breather hoses on the bias.
olle 40 mm fork issues on gas gas contact
in Gas Gas
Posted
There is a Youtube video on how to service this fork. It took less than 5 minutes to find.