Engine smoking

[Greebo]

Bryan j you mentioned before that you used Tesco diesel oil can you remember which one

Yozz'

My K6 had a complete rebuild much the same as yours, the guy who built the engine & the bike is "shit hot" with the 750 sohc engines, he is in Rotherham
When my bike was finished he put Motul 10w40 semi' synth', there was not a hint of any smoke, the only issues we had was the PD carbs getting them jetted & set-up right, during that time frame when we were playing with the jets needle settings etc I had a lot of running on 3 cylinders, then 2 cylinders,  & all this was going on whilst running it in, but it has not had any adverse affects at all on how the bike runs & performs, I have done nearly 2k on the bike now & still as clean as a whistle . I have changed the oil twice I now run on Motul 15w50 semi'
if you cant get it sorted have a chat to Steve who built mine he is on Alma Road Rotherham, his work shop is at the side of Motographics, it would be a good idea for you to pop over & see him just for some advice & he will be happy to help...its only a few miles away from where you are

[yozzer74]

Thanks greebo yeah it's not too far

[MarkCR750]

By the way Yozzer, I assume the smoke is blue, and smells oily, that's what you'll get if your burning oil, if it's black it's an overly rich mixture, if it's a bit like steam it's water evaporating from the exhaust, if it's white you've got diesel in there! 😄

[yozzer74]

It's definitely oil you can see it on end of pipe

[MarkCR750]

Sorry I only just saw the video, yes definitely oil smoke, fingers crossed that Pete's explanation proves correct, I had a CB900 years ago that smoked like that, it was worn valve guides, you could see the oil running down the valve stems!.