INSTRUCTIONS FOR FITTING THE PM1R BT

Remove your old magneto and replace it with your new BT-H unit. Time your engine to the manufacturer’s recommendation. Set your timing using a degree disk or by measuring the piston distance before T.D.C.
Turn the shaft so the centre dot on shaft is at the bottom and remove the stainless set screw that blanks the timing hole. (See close-up picture below.) Now insert the 6mm-timing rod through the timing hole and the shaft into bottom of magneto. You may have to move the shaft slightly until all the holes line up when the shaft will enter quite easily. (If you have lost the timing rod use a piece of 6mm round bar with any burrs removed from the ends. N.B. 1/4" diameter round bar will not do. It is approximately 0.015" too big.)
Dot on shaft at bottom. There may also have an arrow engraved on end of the shaft pointing to the dot. (N.B.* The dot goes to the bottom on platform magnetos and to the top on flange mounted magnetos.)*
Fit timing pinion and torque nut up to 12-15ft/lb MAX.
REMOVE TIMING ROD. Replace stainless timing hole screw. Check your settings. e.g. The piston is in the correct position before top dead centre not after top dead centre, plugs set to 0.018 - 0.020"(0.46 -0.5 mm), everything is correctly tightened and you have removed the 6mm-timing rod. Refit the timing case cover and any other parts you may have removed. Wiring. The blue wire goes to the black spade on the H.T. coil. The brown wire goes to the green spade. The coil does not need to be earthed to the frame. The black wire is for the cut out. It cuts the ignition when earthed. If you do not use this cut out wire make sure that the end is well insulated so that it can not inadvertently stop the engine.