inewham wrote: ↑Mon Mar 08, 2021 6:34 pm
The fact that it fires once means it cant be that weak
Is it a big fat blue spark or a weedy yellow one?
Is the engine earthed properly (if its mounted on rubber bushes you need a proper earth, a wire from battery -ve to a casing screw will do for testing)
Blocked pilot jet? If you squirt some easy start / lighter fluid down th einlet does it fire more than once?
Is the ignition adjustable, could the timing be out
Carb has been stripped and cleaned twice. Jets are good and the correct size. I've stripped the paint from the coil mount and the top engine mount. There are no rubbers mounts.
Spark is blue, but it's not exactly fat, but the iridium plug has a very small electrode.
Easy start makes no difference.
KungFooBob wrote: ↑Mon Mar 08, 2021 6:36 pm
Have you tried a new box fresh plug?
Yes. Standard and Iridium. The Iridium one fires better both are the same grade.
Taipan wrote: ↑Mon Mar 08, 2021 7:00 pm
Am I right in thinking the engine has been overhauled? Crank seals deffo okay? What is the ignition type? Not one of those ones with the old fashioned stator plate that could move is it?
Engine was rebuilt 15 years ago and not been run since. I too wondered about the crank seals, the gearbox oil level hasn't changed or discoloured.
Ignition is CDI with a new (15 years ago) stator plate/ignition coil/hall sensor/whatever you call it. I've tried 3 coils on it. I've checked the resistance in all and they vary, but are in the ball park. The ignition coil on the stator plate, while being new doesn't read right though. A new one has been ordered.