July 27, 201412 yr So, a mixed day today, the two Tufnol spacers have worked a treat and very little heat is being transferred back to the carb, great, happy days. However, after around 8 sections I get that very painful metal on metal noise. Diagnosis between sections ranged from, big end, small end, tappets, push rods, etc etc. I rode the bike back to van really slowly and after say 5 mins the noise had totally gone. I spoke to someone and tried to make the noise happen again, and after letting the engine run for a while and a few Andy Roberton type laps round the field the noise came back. Does anyone have any thoughts, it must be to do with the heat of the engine or the amount of time it's been running. I think it has to do with oil circulation or oil pressure otherwise the noise would be there all the time. I read about the oil pressure valve (ball and spring) and if the pressure gets to high it will let the oil flow back into the crankcase, would this mean no oil would return or get back to the top end? I fear a major overhaul but wondered if any one had any ideas? Thanks all......
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