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Tony Maughan rebuilt my engine many years ago, and he did a fine job, but it did not eradicate the wet sumping problem, close engineering tolerances will slow it down a bit, certainly to an acceptable level, for me anyway, but does Vic have an engineering solution whereby the oil stays in the oil tank when the bike is not in use, as a previous post stated, the real problem here is gravity.Yes, monograde should help, but then you have to wait a while for the oil to warm up from startup till wanting higher revs. Another plus of monograde is it sticks to components longer when not using the bike like in wintertimes. Basically it might be good to have only mnimal oil level in the oil tank for faster warmup at each start. My guess the typical Vincent runs a bit cold most of the time regarding oil temperature ?
Andrew, I did much the same, ordered the Conway's spring valve then put it in the drawer. My main concern was that it might not open one day. The appearance isn't great either. It does appear to be well made!When I bought my Rapide I had all sorts of ideas (not all my own ideas I should add) about solving all those problems and the many horror stories I had heard about... and many of the solutions, I'm glad to say. I found were not applicable to my bike.. I bought from Conways their anti sumping valve, a beautifully made and (probably) easy to fit part. However, I decided it was not the prettiest thing to hang off the side of the engine (although it could possibly distract, only slightly, from the hideously ugly, in my opinion, Elephants Trunk breather! I figured Any breather must be better than that, sorry) So, I have no anti sump valve (except in my spare parts drawer) and haven't found a need for one, I'm changing the oil regularly (20-50) and using the bike as often as possible, even in winter, which is quite mild on Tropical Vancouver Island. I should add my 48 Indian Chief has a oil line tap, it's a gas pipe fitting.. The Indian gets little use, mainly because it's not that much fun to ride. I also have a 1991 Harley that cheerfully dumps 3 quarts of oil out of the breather pipe on start up every spring, the 72 Shovel and even the 54 Panhead are much better behaved. The 75 BMW R90S of course is Teutonically faultless