2 questions

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S&S makes a breather valve #50-8122....small and cheap....approx $6. Has anyone tried it? 3/8 on both ends. If it can stand up to a Harley motor at twice the size it should work in a Norton...my fingers are crossed. The exhaust pipe is in the way of the sump plug so I cannot run the good Comstock sump breather.

2) I have a P-11 motor and trans in a trackmaster frame. JH magneto. I am running the alternator to a podtronics straight to the headlight, grounding also to the headlight and a frame ground. NO BATTERY. will this work with no problem? I will add a tail light, hence the frame ground. World's simplest wiring.
 
the S&S may work.... let us know how it works out.

you cannot ground at the headlight only, you also need to run a ground wire from the headlight to the cylinder head and frame . otherwise your ground path goes though the steering bearings... any sparks here over time would cause pitting which would wreck the bearings
 
Thanks. I didn't know there was an instruction sheet. It seems the breather I bought is for upper engine breathing through the rocker box IN CONJUNCTION with the gear driven breather. It seems like a lightweight device, probably will pump furiously untill it explodes a few days later.

I had the expensive aluminim billet device, the Spyke Krank Vent, stop working so I cut it in half to see what was inside. There is a fixed aluminum structure and the only thing that moves is a small captured rubber disc about the size of a dime. It travels back and forth about 1/8".
 
I checked them out, out of interest, after your post. I drew the same conclusion as you, that it is only a partial vent on the HD, and I also doubt it would be reliable as the only vent on a Commando.

IMHO one of the existing and well proven reed valve breathers is the way to go.
 
8000 miles is very good. Perhaps the S&S would work along with the cam-end rotary breather.
These valves require no pressure to pop them open but the reed valves require a lot of pressure. That is why I would like to use the poppet valve. That and the other reasons I have listed.
 
I used the plastic brake booster check valve in my basically stock 73 850 for years. Judging by how it reduced the amount of oil that accumulated in my catch bottle I'd say that it worked well. The accumulation immediately went from very little to virtually nothing. After about 6,000 miles I switched over to the aluminum unit from Mike's XS It worked just as well as the $5.00 plastic unit but sure looked way cooler. Vanity massaged for under $20.00. Cheap therapy.
 
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