not ron Posted March 22, 2009 Report Share Posted March 22, 2009 I have a Honda TLR 250 which I have ridden, amongst other bikes, for about 10 years. In the past when it needed a reline/rebore it only smoked when on load and high engine speed on the road. Now if I leave it for a week, whenever I start it, it smokes for about 30 seconds and then runs clean all day. This is a very similar symptom to when the oil pumps wear on pre-65 bikes and the oil drains from the tank into the crankcase when left standing. I wonder if anyone has any similar experience, I feel it may not be the normal valve stem seals/piston wear that I have experneiced in the past and maybe I need to check the oil pump before stripping off the barrel. Quote Link to comment Share on other sites More sharing options...
oz thumper Posted March 22, 2009 Report Share Posted March 22, 2009 The TLR is a wet sump motor so oil pump bypass will not cause smoking as in a dry sump motor with remote tank. The usual cause of your symptoms is worn valve guides and/or damaged valve stem seals. If these are worn oil drains down from the valve gear when standing and accumulates in the combustion chamber. Good luck. Quote Link to comment Share on other sites More sharing options...
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