Join Date: Apr 2009
Location: Gloucester, Va, USA
I don't know about the torque spec, but the turn signal is a common problem on cars. The bike probably has a thermal flasher. A thermal flasher is dependant on load. More load = slower cycling. LED lamps draw less current, putting a smaller load on the flasher.
You can do one of two things. Either switch to an electronic flasher (often designated by part number EL-12 - about 10 bucks) or somehow add resistance to the circuit. You could add a small (maybe hidden) bulb to the circuit, or add an inline resistor.
If you still have problems, first check to make sure the LED is hooked up right. A LED is a diode, so current will only pass in one direction, so it is VERY important that correct polarity is observed.