Mariner 2hp (same as Yamaha) no spark at plug

[jbm1967]

Hi, I have a mariner 2hp outboard that will not start. There is no speak at the plug (or it won’t jump the gap). If I hold (don’t recommend this) the plug I still get no shock but if I manage to touch the actual tip I certainly do. If I put a screwdriver in again I get a shock but cannot get it to jump to ground even if held a mm away. So I’m guessing the spark it too weak? Any ideas? Thanks

 

[VicS]

Hi, I have a mariner 2hp outboard that will not start. There is no speak at the plug (or it won’t jump the gap). If I hold (don’t recommend this) the plug I still get no shock but if I manage to touch the actual tip I certainly do. If I put a screwdriver in again I get a shock but cannot get it to jump to ground even if held a mm away. So I’m guessing the spark it too weak? Any ideas? Thanks

If it was completely dead I would say check the stop/kill button,

Worth a quick check perhaps. Check HT lead

You don't give the serial number, or even the year so do not know if it is a points ignition or CD.

If points check, clean & reset them , inspect coil for overall condition. Condenser is another suspect

If CD inspect condition of HT coil. If coil looks OK prime suspect is the CD unit

 

[jbm1967]

I’m not sure if year or serial number. I’ll find out tomorrow if I can. It’s definitely not the stop/kill button (I have discounted it). It’s strange that it is definitely giving volts (they feel quite strong) but won’t jump the gap.

 

[jbm1967]

Spar plug is brand new and I’ve tried 2 different ones.

 

[Stemar]

Don't know if it's relevant, but I had an odd problem with my Tohatsu a few years ago. It turned out to be corrosion on the earth of the coil. A quick clean and a dab of copper grease and all was well again. May be worth looking at