Quote:
Originally Posted by Geezer-Glide
I just had a thought.......
How does the vent attach to the crank case? Is it threaded into the case? Iron Head Sportsters, (AMF vintage) used a one way check valve to vent into the primary, which is wet. They would go bad from time to time and become two way valves. We would just braise them shut, and then run ATF in the primary. The Sporty's vented on the cam side, under the generator so it was no issue closing them up. Check out the compatibility between a mid 70's sportster vent valve and yours.
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My crankcase vent is a breather tube that comes out of the crankcase on the primary side. I've attached a hose to it to vent it back to the chain. If I close it off, crankcase pressure builds up until a gasket blows somewhere else, resulting in a big mess. Don't ask me how I know.....