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The Boyer-Bransden MKIII is a contactless ignition system utilising an advanced and patented trigger switching system and featuring electronic advance and retard. The kit replaces the auto advance unit, points, points plate and condensers. Engines function best with a retarded spark for starting and low revs, but need ignition advance to run at high speed. The MKIII's analogue system simply advances the spark at a set rate from fully retarded to maximum advance, as engine speed rises from zero to 4,000 revs. Thus eliminating the inaccuracy of mechanical advance/retard units. The Boyer-Bransden Mark 3 Contactless Transistor Ignition provides absolutely accurate timing for motorcycles. Once set it cannot vary its precision. It incorporates an advance and retard circuit which has no moving parts and is fully sealed for life in a material which is water, petrol and oil proof. It simply cannot wear out. There are no "rubbing parts" - no friction. There is a much better spark - at all engine r.p.m. figures. For improved economy, starting, smooth running, and all round performance, you can't beat the MK III!! See the 331-Series in the Price Guide for price and availability. Replacement parts are also available. Warrantied! The Micro Digital Ignition provides almost total control over ignition functions. In common with the MKIII, it offers electronic control of advance and retard functions. However, because the Micro Digital features a built in computer, the size of a postage stamp, it can make more than a million ignition decisions per second, to constantly monitor engine speed and time the spark precisely to suit. The programming of this microprocessor also gives control over ignition coil energy, starting speed, tickover stabilization and rev limits. In common with the MKIII, these systems are manufactured using the finest semiconductors and are fully encapsulated to protect against moisture intrusion. All units are guaranteed five years. NOTES: Coil Requirements - Boyer Electronic Ignition Kits work best with less than six ohms total resistance on the primary side of the coils. Since the coils are wired in series, the resistance is the total of all the resistance in all the ignition coils in the system. Stock 12 Volt coils have 3.5 ohms of resistance each, so a twin cylinder bike with two coils has a total resistance of seven ohms, and a three cylinder bike has a total resistance of 10.5 ohms; both more then the limit of the Boyer kits. The modification is to install 6 Volt ignition coils, which have a resistance of approximately 1.7 ohms each, so that the total resistance in a twin is 3.4 ohms, and in a triple is 5.1 ohms, both within the allowed impedence range. Only the the ignition system is involved, nothing else needs to be changed. Since single cylinder bikes have one coil (3.5 ohms) they do not require a new coil. Later Norton Commandos have six volt coils with a ballast resistor so the coils are kept and the ballast resistor removed. Every kit is supplied with complete instructions and a troubleshooting guide. GENUINE BOYER BRANSDEN
ELECTRONICS GENUINE BOYER BRANSDEN
ELECTRONICS For instructions
please see the Tech Help Page
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