timing mark

Mon May 24, 2004 8:51 am

My pulley has only one timing mark. Is this TDC or 16' before TDC?


Mon May 24, 2004 9:09 am


Your Cub was originally fitted with a mag and the single mark was used to find TDC for installing the mag.

Mon May 24, 2004 2:52 pm

Thanks George,

Now that my system is no longer magneto based do I time it such that the points are .020 at TDC or should I advance it a bit? I have heard it runs better advanced but may be prone to kickback. I use the handcrank usually and it fires off on the first pull.

Mon May 24, 2004 9:01 pm


The points should be set at .020" when the rubbing block is exactly on the highest point on the cam. Then the distributor should be set so that the points just begin to open at TDC. An ohmeter is very useful to determine the exact point. This is the right way to set it for a hand cranked tractor. The centrifugal advance automatically advances the spark properly when it is running. (I think the automatic advance is 16 degrees)

A properly set mag. or dist. should never kick back... and an operator cranking properly should always expect it to.