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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil consumption
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<blockquote data-quote="greg brillus" data-source="post: 132858" data-attributes="member: 597"><p>I would say the bike sounds perfectly normal.......especially using that thin an engine oil. The bikes sent out new from the factory would have used oil on account of the oil passage through the liner being too high up and delivering oil into the rings. Nowadays everyone's expectations are that of the modern car/bike that it should be oil tight no matter what.........well to find a perfectly oil tight Vincent is extremely rare.......no matter how well built it is. Probably better if you change to the "D" type breather cap over the front exhaust valve, and blank off the original spot with a new sump drain plug and sealing washer......Run this pipe aft and down forward of the battery box, and "T" it together with another short flexible pipe to the oil tank breather line, then run this with a length of 3/8" bore black oil hose just aft of the rear axle on the left side of the machine. If the engine starts quite easily now, I would go to a higher viscosity oil........If the drive side main bearing is a standard open type it will loose some oil into the primary, this is normal, but just drain off the excess every so often. If the primary level comes up say a 1/2" more than the drain plug height, it will tend to loose some oil out from where the generator passes into the top of the primary housing.......Some folk go to all sorts of effort to seal the generator here, but I have found it not necessary.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 132858, member: 597"] I would say the bike sounds perfectly normal.......especially using that thin an engine oil. The bikes sent out new from the factory would have used oil on account of the oil passage through the liner being too high up and delivering oil into the rings. Nowadays everyone's expectations are that of the modern car/bike that it should be oil tight no matter what.........well to find a perfectly oil tight Vincent is extremely rare.......no matter how well built it is. Probably better if you change to the "D" type breather cap over the front exhaust valve, and blank off the original spot with a new sump drain plug and sealing washer......Run this pipe aft and down forward of the battery box, and "T" it together with another short flexible pipe to the oil tank breather line, then run this with a length of 3/8" bore black oil hose just aft of the rear axle on the left side of the machine. If the engine starts quite easily now, I would go to a higher viscosity oil........If the drive side main bearing is a standard open type it will loose some oil into the primary, this is normal, but just drain off the excess every so often. If the primary level comes up say a 1/2" more than the drain plug height, it will tend to loose some oil out from where the generator passes into the top of the primary housing.......Some folk go to all sorts of effort to seal the generator here, but I have found it not necessary. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil consumption
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