I once THOUGHT I figured out how a KLR650 spark advance works (no centrifugal spinning weights, or manifold vacuum-actuated point plate shifting, to exploit, as in prehistoric points/coil/condenser ignitions).
Goes like this: Pickup coil voltage varies with rpm; at higher rpm, pickup coil voltage increases. Increased voltage reaches thyristor (silicon controlled rectifier (SCR)) firing threshold earlier in flywheel rotation degrees, thus advancing spark at higher rpm.
Can anyone confirm, or deny and postulate an alternate operational mechanism for KLR650 spark advance?
Don't think KLRs have the sophisticated ECU computers and inputs used by more advanced engines for controlling ignition spark timing.
Otherwise, discussing automobile engines in general, Google seemed somewhat emphatic, maybe even dogmatic, saying essentially: "If you ain't got no distributor, you ain't gonna adjust spark timing."
“You better put down that gun. You got two ways to go, put it down or use it. Even if you tie me, you’re gonna be dead.” "John Russell" (Paul Newman), Hombre
Last edited by Damocles; 10-15-2019 at 01:02 PM.