What ho one and all,
Yes, it is a Honda engine, but a small garden, 4 stroke engine. In particular, the popular GX25 sitting on a rotavator/tiller.
It is a couple of year old and does not get excessive use. It has gradually, become more difficult to start until recently, it will not start at all. So a Google search reveals the most probable cause is the carb and a refurb kit is not expensive. Bought a Chinese number, complete with new spark plug and ignition coil.
Cleaned the carb, fitted the other bits and still, it will not start. Almost does, but not quite.
Went the next stage and bought a new carb which I fitted today. Again, tries to start but generally, zilch. On a couple of occasions, it has run fro around 5 seconds,then dies. All the fuel lines have been blown through and are clear but it almost feels like fuel starvation.
I have checked the spark plug and it sparks. Finger over the spark port and there is compression, but not as much as I would have expected. Removed the exhaust to check and that is clear. Again, finger over the port and 'kinda' back-fired as I guess I was blocking the exit! But certainly compression.
Removed the valve cover to check that the timing belt is in place and all looks good with valves doing what they should.
Tried again, and this time, some kind of back compression almost broke my wrist!!! There is now a lot of compression that is preventing any sort of turn-over. Since I did not fiddle with anything mechanical (valves or timing belt) don't know what has happened.
But given that it is a pretty simple single cylinder engine, I don't know what else could be out of wack that it will not start. I can only think the timing belt has slipped, but that does seem unlikely.
So I hope the greater mechanical minds on this forum will be able to offer some advice.
Thanks and toodle pip