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I have read somewhere that a modification was made to the return fitting in the oil tank during production of the lightweights, a restrictor to encourage oil up to the cylinder? It carried over to the heavyweights, or the other way around?
Can anyone enlighten me?
Thanks.
Lightweight oil return connections
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Hello John,
I'll try to answer.
Probably best you do a search on Google for images of Jubilee oil tanks. All will become clear.
Earliest De Luxe lightweights, with a tank under the seat, had an adaptor on the oil return connection. The removable adaptor incorporated a restrictor and a banjo connector for the rocker feed. When John Hudson recommended the use of the more restricted lightweight oil return on heavyweights, to get more oil to the rockers, I believe he was referring to the De Luxe oil return arrangement. This did not change for the life of De Luxe lightweights.
The much more common standard lightweight had a brazed return connector assembly brazed to the tank itself. Restrictor incorporated and no banjo connector, just a stub pipe for the rubber rocker feed pipe. The part number for the std l/w oil tank remained the same 23064, across the range, from inception to the end. Suggesting that the oil return was never modified on standard models.
Cheers
Peter