Honda G300 engine no spark

[Ganers 0]

Hi all. 
I have an old Honda G300 engine that just stopped running. 
It has fuel to it and I found no spark. The usual points checked, plug changed, condenser checked the changed and coil checked and changed twice for new ones in case I got new dud one. The fly wheel was cleaned out the magnets still strong. New plug cap, I even tried changing the points and condenser for a CDI unit, bug nothing works. 

Also it has no oil cut out switch and the oil level is ok. 

Can anyone help me it’s a shame for it not to be running but I’ve run out of ideas. 
Thanks Lee.

[Tractorhead 8,607]

CDI‘s are available in different sizes, 

some needs magnets in flywheel and is external supplied, some are self supplied.

i‘m not sure i understand it correctly.

do you try a cdi with point‘s?

 

the CDI needs a fitting Pickup to act.

thats a small coil that inducts a voltage to fire the CDI.

 

Please more and detail info‘s and maybe few pic‘s to see what you have tried.

A pic tells sometimes more that hundrets of words.

 

[Ganers 0]

To clarify. 

The fly wheel has a magnet with the coil inside. I’ve attached a photo as it was originally with flywheel removed, it’s pull start. 

I checked the points with all wires from condenser and coil removed to ensure continuity when they closed and not when open I also checked the grounding of the points. 

Then I checked the condenser with a multi meter to ensure it charges and discharged. 

I then replaced the coil which came with a condenser attached which I also checked. Still no spark. 

Believing it could be a new bad coil I bought another from a different supplier again with attached coil, still no spark. 

I cleaned all ground points still no spark. 

In desperation I bought a CDI UNIT which is supposed to replace points and condenser, the wiring diagram is crap but shows it taking the wire from the coil to the unit and you do away with both condenser and points. Still no spark. 

The flywheel has been cleaned and brushed and the magnet is still strong. 

I’m completely stumped. 

Cheers Lee. 

[Tractorhead 8,607]

The thin black wire from the Coil was the Stop line.

check with an ohm meter if you moving the flywheel gently, there is a resistance measured.

if there is continousely ground, you seems to have that wire somwhere squezzed.

as far as i know the g300 has an additional oil sense stop.

 

maybe that interrupts you Engine.

 

as far as coil was in, the points have enough gap to work,

and the thin black wire( stop line) is off ground, you must have a spark.

tried with another sparkplug?

 

 

 

 

 

[Ganers 0]

Hi. 

Ive swapped out the condenser and kill wire completely, as I now have three, the points were gapped and confirmed with a meter, and two different plugs tried still no spark. 

Ive been all over it and can’t find an oil level cut off so I don’t think it has one. 

Its so simple a system it should spark, but it doesn’t. 

[Willy55 0]

I had the same no spark issue with my Honda G300 powering a very old Honda generator.

In an attempt to fix it I changed the coil and condenser with a new unit I bought on Amazon. 

The coil arrived without the part that fits over the spark plug. 

The original Honda spark plug boot part appeared very robust and in good shape therefore I opted to use it on the new coil.

Luckily I tested the original Honda plug connector first with my ohm meter first and discovered it read "open line".

Spark problem found!

I used  a rubber boot and wire end cap off an old set of car plug wires I had lying and  I now have great spark! 

You may want to check yours for the same issue.

Hope this helps. 

[leftcounty@gmail.com 0]

@Ganers, did you ever resolve this? I'm in the same situation. Thanks!