Intermittent misfire under load.

[spudulike]

Did you ever check the fuel line as it could be opening up a split in certain positions. It is where it pushes through the tank wall?

You can check the kill wire from the kill switch through to the coil, it may be earthing on the metal saw body but would need a chaffed wire and bare metal to do this.

[seanshaugh]

Ignition coil/module is down at flywheel takes readings off flywheel blue in colour looks like it’s a issue with your on /off switch or wiring goin to it

[Guest Gimlet]

1 hour ago, spudulike said:

Did you ever check the fuel line as it could be opening up a split in certain positions. It is where it pushes through the tank wall?

You can check the kill wire from the kill switch through to the coil, it may be earthing on the metal saw body but would need a chaffed wire and bare metal to do this.

I looked at the fuel line but I think if it was perforated it would leak and smell, and it doesn't. Looks to be the kill switch. 

 

[adw]

Simple to do a quick check, disconnect the wire to the ignition unit, move it away so a not to get caught in the flywheel, now try again, if the problem has gone then its the switch or the wire shorting out.

[Guest Gimlet]

Sorted. Thanks for the help everyone. It was the kill switch. 

 

Luckily, I've rewired a few motorbikes so I have a stock of factory quality Jap type terminal connectors and a proper crimping tool. Cutting off the crappy pre-insulated crush-fit connectors which some workshop I took it for something must have fitted at some point, and rewiring it with decent ones has done the trick.

[spudulike]

Thanks for letting us know. Glad it is sorted.