Honda-SOHC

Hi All, I am at it again. I have been fiddling with the K1 trying to eliminate some popping/backfiring in the exhausts. (usually on the overrun)
Done the points/timing exercise and the advance/retard is working fine. I will need to balance the carbs at some stage, but I have noticed some gas blowing from the exhaust downpipes. The previous owner fitted a new set of standard exhausts and looking at the head, the mounts have also been replaced. It seems to be leaking where the slots are machined into the pipes just by the clamps (Hope this makes sense) Before I take it all off, is this unusual? Apologies if this is a daft question, but I have no experience of these hondas.
Thanks again
Seamus

Thanks for the replies. I understand that the Dyna S replaces the points, but is'nt there a recommendation that you also replace the coils to ensure sgood high speed running? or do the standard coils work OK. I have a 70 K1 (US import).
Does the 2000 system have a black box (a bit like the Boyer)
Again, I am open to advice from folk who have been down this road before.
Cheers
Seamus

Hi Folks, Just acquired a 71 K1 750 and have joined here to learn a bit more about it. I will post some pics when it stops raining enough to go outside