I have a tachometer i want to hook up to my 2003 Rebel250.
My problem is that the directions ask for "sparks per rotation"
Since the motor is twin cylinder and makes a wasted spark..what mode should i mode set the tach? 1 spark per revolution or 2 spark per revolution?
Im measuring RPM.
The wire to the tach wraps around one of the spark plug wires.
As Guba first posted, each piston sparks once per rotation of the crankshaft, which is similar to a two stroke engine, even though it's a four stroke engine. If the tach reads one spark plug, I assume you would set it to two sparks since most engines fire each cylinder once per four stroke cycle (two rotations of crankshaft per cycle), and the Rebel does twice that.
Hope that doesn't confuse you.
Keepin' all the left over parts. Gonna use 'em to build another bike!