no spark in 4hp 2 stroke

[Ready4It]

late 90's model (# 0d987517)

good compression but no spark when i ground the spark plug to the block.

where to start?

 

[galamb]

Yep - 1996 model.

Believe these were built by Tohatsu for Merc (early days of their joint partnership).

First thing I would check is the stop circuit (wires to and from the stop switch). I have never worked on one of these and because they are not a 100% Merc product I can't tell you for sure what colour the wires on the stop circuit are - on Merc's they are a black with yellow striped wire - would think it's the same on this, but possibly not - just get a look at the wires going to your stop switch and check the colours.

you can unplug them from that switch (to check to see if it's shot - just don't let them ground on the block. Also trace them to see if the plastic coat is wore off/rubbed off anywhere - if bare wire is touching the block you will get no spark.

That's the first thing to check. From there it's a systematic "process of elimination" for all the ignition components - start with the easy stuff (change the sparkplug), check the continuity of the spark plug wire, continuity from the coil back to the coil under the flywheel - then the spark plug coil, coil under the flywheel etc.

Check the easy (cheap) stuff first, and go more complicated (more expensive) parts from there.

 

[Ready4It]

Yep - 1996 model.

Believe these were built by Tohatsu for Merc (early days of their joint partnership).

First thing I would check is the stop circuit (wires to and from the stop switch). I have never worked on one of these and because they are not a 100% Merc product I can't tell you for sure what colour the wires on the stop circuit are - on Merc's they are a black with yellow striped wire - would think it's the same on this, but possibly not - just get a look at the wires going to your stop switch and check the colours.

you can unplug them from that switch (to check to see if it's shot - just don't let them ground on the block. Also trace them to see if the plastic coat is wore off/rubbed off anywhere - if bare wire is touching the block you will get no spark.

That's the first thing to check. From there it's a systematic "process of elimination" for all the ignition components - start with the easy stuff (change the sparkplug), check the continuity of the spark plug wire, continuity from the coil back to the coil under the flywheel - then the spark plug coil, coil under the flywheel etc.

Check the easy (cheap) stuff first, and go more complicated (more expensive) parts from there.

Unplugged wires to stop switch and still no spark.
what would be the next move?