Just had a few days touring in Normandy ,first time out on the '78 R80/7 ( thanks for the advice on my brakes) and had a great time on the country lanes,going around the D Day sites etc. Good starting and tick-over,quiet motor which pulls well,only issues were at about 70mph it stutters (surges) a bit and just has nothing left to offer, Also after pulling over after a good run up the main carriageway it was blowing whiteish smoke from only the left cylinder pretty badly. This stopped after resuming a slower pace. I have never had the heads off this one but I am thinking piston rings , worn bore ,valves and guides or all three .I but why is it ok most of the time ,Also I had good compression on both cylinders last time I checked . Anything else I should be looking for ?
I want to re check ignition timing this week with a timing light but apparently cant adjust the back plate while running with a timing light as the advance and retard unit is in the way on the screws. I have been told It is a case of trial and error , is there any way to adjust with the motor running? Just to say I am loving this bike, after years without a bike or with my last one a K100rs this one even sounds right !