QuestionI have a '64 h60 Ariens. I just rebuilt the points
And put in a condenser but forgot to mark the stator.
How do you set the flywheel magnet gap? I saw the specs of
0.90 bdtc & 0125 gap , how do you set them?
AnswerHi Tom
1st set the breaker point gap , turn crankshaft until point rub arm is resting on the high side of ignition cam , set point gap by loosening the screw on the movable point and insert a 0.020 thou feeler gauge and adjust so that there is a very slight drage and tighten screw and recheck gap - readjust as needed
leave the leads comming from points disconnected at this time ,
you may need to remove cyl head to do via piston movement - easier to measure with head off
you will need to set the piston at correct position BTDC on compression stroke
that is 0.080 BTDC or 2.03 mm BTDC , you will need to set at TDC 1st then set a depth gauge to the exact depth of plug hole to piston and that point and measure it then add 2.03 mm to that measurement and then run the piston back down the bore on compression stroke then back up to the measurement you noted ( tdc measurement + 2.03 mm )
leave piston at that point , connect a continuity buzzer between point lead and earth and loosen 2 bolts holding stator plate down and rotate until continuity buzzer indicates no contact to earth , tighten the stator plate screws , connect point and condenser leads
plug gap 0.028 -0.030 thou
my rule of thumb has been if piston @TDC compression stroke points should be broken 0.003 thou , std point gap 0.020 thou - wider gap -later spark,-small dwell -
close gap-earlier spark- large dwell
usually timing is set with a dial gauge and offset leg to reach piston
service manual does not say anything about flywheel gap , this should be set with flywheel and crankshaft if units have internal mounted coils
does your unit have a external ignition coil if so set air gap with flywheel magnets under the coil legs to 0.0125 thou and tighten mount screws , be sure flywheel does not contact
hope this helps let me know if it does
cheers paul
