is there any evidence of fuel on the spark plug when you take it out to check? e.g. is it wet, is there actually fuel getting to the cylinder?
Maybe worth checking the injector/fuel pump is working if you're not sure. Taking injector out and having it squirt into a jar would confirm it's working. If you find there's no fuel pressure, testing the fuel pump is easy - just take the hose off and it'll shoot a jet of petrol straight up if it's working - likely as soon as you turn the key, and then again/more if you hit start.. Mind your eyes and obvs don't do it indoors/next to an open fire.
Also - compression. If you try turning it over by hand can you feel compression? turn over using a socket in the central hole on the stator side, turn anti-clockwise.
If it has fuel, air, spark and isn't firing then I would probably be looking at compression next. Due to the teeny tiny spark plug hole getting a compression tester in there is quite difficult so gauging it by hand may be the only option. The compression ought to be quite firm and noticeable at first and would fade slowly (e.g. if you turn it really slow) but you should really be able to feel it sealing. If that resistance isn't there that could be the issue.
If the motor turns over really easily on the starter (vs you can hear it having to work to do the compression) that could be another clue towards it being low.
hope that helps..
Maybe worth checking the injector/fuel pump is working if you're not sure. Taking injector out and having it squirt into a jar would confirm it's working. If you find there's no fuel pressure, testing the fuel pump is easy - just take the hose off and it'll shoot a jet of petrol straight up if it's working - likely as soon as you turn the key, and then again/more if you hit start.. Mind your eyes and obvs don't do it indoors/next to an open fire.
Also - compression. If you try turning it over by hand can you feel compression? turn over using a socket in the central hole on the stator side, turn anti-clockwise.
If it has fuel, air, spark and isn't firing then I would probably be looking at compression next. Due to the teeny tiny spark plug hole getting a compression tester in there is quite difficult so gauging it by hand may be the only option. The compression ought to be quite firm and noticeable at first and would fade slowly (e.g. if you turn it really slow) but you should really be able to feel it sealing. If that resistance isn't there that could be the issue.
If the motor turns over really easily on the starter (vs you can hear it having to work to do the compression) that could be another clue towards it being low.
hope that helps..
