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Single Fire or Dual Fire??

Mayakovski

GT Reference
GT Famiglia
Joined
Dec 17, 2017
Messages
1,093
Location
Comox, BC, CANADA
I have been looking into adding an aftermarket Tach to a Stone. But all the parts listings state for Single Fire Coil or Dual Fire Coil. What does that mean in relation to a Moto Guzzi Stone?
 
It usually refers to whether the spark plug fires every time the piston comes up or every other time the piston comes up. In some cases it also refers to whether the coil fires both cylinders or just the one, but I don't think that is what they are talking about in this case.
Sadly, I don't know if the V7 fires every time or every other time. If the coil is triggered off the crank it is usually every time, and if the coil is triggered off the cam it is every other time.
 
Wiring diagram shows two separate coils triggered by different outputs of the ECU. I can't imagine why they would design it to trigger each cylinder on every revolution.
 
Well, it has a phase sensor off the cam phase wheel. One coil per cyl and does not fire them at same time.
Call the mfg of tach, they will send you the right one.
 
If it fires the coils based of cam shaft rotation, it should be single fire, firing each coil every two crank shaft rotations, as the cam shaft rotates once for every two crank shaft rotations.
If it fired the coils based on crank shaft rotation it would typically fire the coils every rotation of the crank shaft.
 
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