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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Breather back into oil tank
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<blockquote data-quote="Gary Gittleson" data-source="post: 108291" data-attributes="member: 3625"><p>I did something like this with a goal possibly opposite to yours. I have a D Rapide, so there are likely some other differences. My goal was to stop the breather on the oil tank from spewing small amounts of oil. Since my bike is a D, it has no timed breather. It does have one of those D-style caps on the front cylinder. I mounted that over the front intake valve (instead of over the exhaust, so it can't be easily seen). I then added a one-way valve to the attached hose and routed that to the rear of the bike.</p><p></p><p>Next, I drilled an old valve cap and threaded it for 1/8" pipe thread (NPT). I cut one threaded end off a brass 1/8" pipe nipple and bored that end to fit a bit of plain brass tubing whose OD was the same as the fittings on the oil tank (5/16"? I don't remember). That was then soldered in place and the remaining threaded end of the pipe screwed into the valve cap. The cap was installed over the rear exhaust valve. I installed a hose from this new breather to the chain oiler fitting on the tank and removed the metering screw. The screw was replaced with another one with no point which holds a deflector I made for the return oil. I also bought a non-breathing oil tank cap. The whole thing seems to be working quite well. I still see a small spot of oil (an inch or so) on the ground after a 100 mile ride, coming from somewhere under the right side of the engine. I plan to put the bike on a lift to search for the source.</p></blockquote><p></p>
[QUOTE="Gary Gittleson, post: 108291, member: 3625"] I did something like this with a goal possibly opposite to yours. I have a D Rapide, so there are likely some other differences. My goal was to stop the breather on the oil tank from spewing small amounts of oil. Since my bike is a D, it has no timed breather. It does have one of those D-style caps on the front cylinder. I mounted that over the front intake valve (instead of over the exhaust, so it can't be easily seen). I then added a one-way valve to the attached hose and routed that to the rear of the bike. Next, I drilled an old valve cap and threaded it for 1/8" pipe thread (NPT). I cut one threaded end off a brass 1/8" pipe nipple and bored that end to fit a bit of plain brass tubing whose OD was the same as the fittings on the oil tank (5/16"? I don't remember). That was then soldered in place and the remaining threaded end of the pipe screwed into the valve cap. The cap was installed over the rear exhaust valve. I installed a hose from this new breather to the chain oiler fitting on the tank and removed the metering screw. The screw was replaced with another one with no point which holds a deflector I made for the return oil. I also bought a non-breathing oil tank cap. The whole thing seems to be working quite well. I still see a small spot of oil (an inch or so) on the ground after a 100 mile ride, coming from somewhere under the right side of the engine. I plan to put the bike on a lift to search for the source. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Breather back into oil tank
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