I have a great 74 R90S which runs really well at all RPM, but is really hard to get going especially when the weather is cold. The bike is dual plugged and the timing is set almost to the OT mark. Valves are set.
Thanks to a really good battery, I almost warm the bike up with the starter and then the bike well half run with the starter still engaged and finally will start, sometimes after numerous sputters and dieing.
I've had a few airheads, but this is my first S with the Del Otros.
Two things. 1. The choke lever seems to be over choking when the lever is fully depressed. 2. I noticed the right side carb rotates easily on the intake tube. Perhaps a vacuum leak here?
The bike was dual plugged oh, 30 years ago but only has 50K on the clock. Perhaps weak spark?