To ensure 12+V to the Boyer I have bought a electronic box that takes 5V to 30V in and puts out 13V (or whatever you set it to between 6V and 28V) with 8A max current draw. So it's both a step up and step down voltage stabiliser. So it not only stops kickbacks but protects the boyer if the regulator fails and the volts go too high.
Amazing bit of kit. Seems like a very fine piece of equipment, would just need proper vibration isolation and weather protection...
I looked at the online reviews for the one I bought, its says max 8 amps but to achieve that you need to be up close to max volts, but the reviews confirm that at 12V it will pump out enough amps for a Boyer.
Cliffs, your first link looks to be good, but the second is limited to 3A which is not enough.
Rear brake safety spring
Rear sets
mud flaps
and JD Cornhead grease.
I am glad I bought tires, brakes and cables.
Mike, I'm sure you'd get far more grip with Tyres