I just bought a 1966 Dunelt 3-speed bike and I'm having trouble with that wacky Sturmey-Archer hub. These problems seem to be confined to my "low" gear (marked 3 on the shifter). I should mention that it's also a coaster brake.
One, the crank will suddenly disengage and spin freely without applying any power to the chain. By pulling backwards a little, I can get it to catch again, but it usually disengages again quickly. Sometimes it works awhile.
The second problem is that I "locked up" the rear wheel a couple of times when I got off the bike and then tried to go again. The wheel just stuck and refused to turn. I got off and tried rotating the pedals and they wouldn't turn; neither would the rear wheel turn when I tried to rotate it directly.
Both problems were fixed by shifting into a higher gear, but I want to use all three of them! Does anyone know what to do about these issues? Thanks!