Mercruiser 120 poor starting

[Scott06]

Just cleaned and gapped them. Will put a meter on them this weekend.

compare spark gap test before and after setting with dwell meter. Dwell is what determines the amount of time the coil builds up spark energy prior to firing.

this is a great video explaining how points work and a fantastic example of what a good spark looks like. The money shot is at 5:07...

 

[Scott Danforth]

Gapping alone may get you home , but it isn't accurate it in the +/-40% range

Dwell needs to be correct to get coil saturation so that when the points open, the magnetic field is as strong as possible when it collapses and energizes the secondary windings providing the coil output

The meter will tell you your dwell..... And the health of the condenser

 

[Guffer]

compare spark gap test before and after setting with dwell meter. Dwell is what determines the amount of time the coil builds up spark energy prior to firing.

this is a great video explaining how points work and a fantastic example of what a good spark looks like. The money shot is at 5:07...

Very helpful! Wish my spark look like that

 

[Guffer]

Gapping alone may get you home , but it isn't accurate it in the +/-40% range

Dwell needs to be correct to get coil saturation so that when the points open, the magnetic field is as strong as possible when it collapses and energizes the secondary windings providing the coil output

The meter will tell you your dwell..... And the health of the condenser

I've learnt a lot in a few months. Thanks v much.

 

[Buster53]

there is no IAC on a 3.0 liter carbureted motor

Good to know. Thanks