The bike is a 73 Tiger that I have owned for 26 years. I had the engine and gearbox overhauled by a reputable shop, the full box and dice you might say. I ran the thing in as instructed and after 1500 k's the thing was using 150mls per 100 k's, so took it back and was told the bores were glazed so a quick hone with new rings etc etc. The running instructions were the same as previously and I faithfully did as instructed but once again after 1500 k's it was still using the same amount of oil. I sort of thought to myself it wasn't glazed bores so off to another Brit specialist who diagnosed the crappy one piece oil ring that had been fitted, so repeat the above procedure i.e. a hone with " decent rings " and identical run in instructions and off you go. This fellow suggested new guides and valves and they were replaced. Well the bike has run like the proverbial Swiss watch ever since the first overhaul and after the third set of rings nothing had changed much to my chagrin. So now I know it is not glazed bores or inferior rings so I start to fiddle with it and find 500 mls in the sump, drain it out and run it for an hour and there you go still 500 mls in the sump. The man from Morgo sells me a pump and that is the end the 500 mls in the sump, back to normal, so my question is if there had been that amount of oil in the sump the whole time i.e. from the first rebuild, would that have prevented the run in procedure from being effective?? Some extra information is that the tips of the exhaust pipes are wet and sticky and have been since day one after the first attempt yet the plugs have never looked oily, in fact they are the same plugs from the start. The thing runs beautifully right from idle to red line. The guides have been replaced twice as have the valves. The washers under the head bolts upgraded and the divots there were not too bad. I use the same oil always, Penrite 20/50. The only oil leak is from the exhaust pushrod tube and this only lasts for the first ten minutes and then stops. I have run out of ideas so any suggestions much appreciated and sorry for the rather lengthy post. Cheers.