bobinthemtns
New member
Okay...
So 1977 R100S, last week it started coughing and sputtering at speed..
Naturally I assumed it was time for a spring-time carb clean-out..
But squeaky clean carbs didn't correct the problem.. checked the air filter, valves.. nothing.
Then I remembered the adage I've seen posted here about the majority of carb problems being electrical.....
So popped off the front cover to check the points- when I run the motor watching the points, at about 3500-4000 rpm's the small spark you see on the points grew to what looked like a spiderweb of electricity covering the whole points area...... and (shocker!) when the arcing grew to that degree is when the motor would sputter....
So, bad condenser??
So 1977 R100S, last week it started coughing and sputtering at speed..
Naturally I assumed it was time for a spring-time carb clean-out..
But squeaky clean carbs didn't correct the problem.. checked the air filter, valves.. nothing.
Then I remembered the adage I've seen posted here about the majority of carb problems being electrical.....
So popped off the front cover to check the points- when I run the motor watching the points, at about 3500-4000 rpm's the small spark you see on the points grew to what looked like a spiderweb of electricity covering the whole points area...... and (shocker!) when the arcing grew to that degree is when the motor would sputter....
So, bad condenser??