Hi all, another update/query.
So, as mentioned previously, the engine doesn't really appear to be firing or if it does it's the very occasional splutter. With the exhaust removed and spraying some SYB into the spark plug hole and adding some to the air supply, with the fuel connected I did get a couple of pops, but that's it.
I put the muffler back on and tried with no fuel, just SYB in the spark plug hole and with the mower on the bench, and I heard nothing. Now that could just be the muffler doing its' job, or it could be something else, sure.
But then I thought... I want to see it fire. So back to another test, I left the muffler on and removed the decompressor. When I sprayed fuel in the decompressor port and tried to run, the engine fired. Similarly, if I put enough SYB down the snorkel, it fired.
That got me thinking maybe yet again it was something to do with the decompressor. Tried a new decompressor again... No go.
Has anyone got any thoughts? Why would it fire with the exhaust or decompressor removed, but not with them on? Or if it does fire with them on, it's so quiet it doesn't sound like it's firing. Is it possible that maybe the timing of the firing is off, so maximum compression isn't achieved and therefore the piston isn't being pushed back down forcefully enough to continue the process?
Keep in mind, the tests I did above were performed with the fuel tank removed, so it shouldn't really have anything to do with the carby I would imagine.
Finally, what are your recommendations RE how much SYB or 2-stroke mix I should put in the spark plug hole when testing this to see if I get a few fires? At the moment, I've been putting in minimal amounts so I don't flood the engine or get the plug wet and stop it from firing at all.
Cheers again in advance everyone!!
