Regarding the vent fitting/line that exits out the lower right rear of the ham can, where was the line originally directed or what was it connected to? The subject fitting on my bike ('74 850) has a rubber hose on it that rises 3-4" and terminates with a bolt stuck in the top of the rubber tube. Thank you.
Ham Can Question
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illf8ed said:
OK, thanks for the reply. Somebody had previously blanked off the air filter hole and just run a long vent line from the oil tank down below the tranny to atmosphere. I suspect the oil tank vent running into the air filter was a pollution-related idea from back in the day. I'll leave it as it is, since it doesn't sound good to be running the smutty air from inside the engine back into the carbs.
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WZ507 said:
I suspect the reason for connecting the oil tank breather to the air filter is in case air is sucked into the oil tank it's filtered. Not so much the smutty air from the engine than the particulates in the air outside getting into the tank. If you have a reed valve in line with the engine breather there shouldn't be any negative pressure in the oil tank anyway so you won't need to filter the oil tank breather.
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Anonymous
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The 'smutty' engine air is meant to be 'purified' in the cauldron of the combustion chamber instead of fouling the atmosphere. The low pressure in the ham can helps draw the gases through the oil tank.
Ta.
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