Thanks Jack Bigted and Bruce. I think the photo will work now at least I have got past the earlier stage.

Thanks AVB, unfortunately I don't have the level of smarts to know what you are talking about, or I have failed to communicate the problem successfully. I think what you mean is that the nozzle should be screwed all of the way in once the carburettor is assembled. With the result being like the picture?

I am guessing that the carburettor seat is completely missing, which is why the only thing stopping the nozzle from screwing in further is the carburettor throat, you can see a restriction at the end of the hole that the nozzle screws into but it does not look like a manufactured seat. Hopefully the pictures will help explain it (they don't show when I preview the post, I will check after posting). Should there be another part on the nozzle which butts up against something in the carburettor. I think your suggestion about after market parts is correct as the float needle valve is plastic The existing nozzle is 2" long possibly it is not the correct one at all.


It would seem that it would be very difficult to source parts for the carburettor if that is the problem, what is the likely hood that a carburettor off from a more recent motor would fit and make the motor run?

I cannot help but feel that there is another problem somewhere, my past experience with these old motors is that they are very forgiving in relation to settings and may not run well but will still run. I would expect the engine to run a little by putting a little fuel in the plug hole. Did you have any thoughts on reversing the polarity on the ignition module? Is it likely to damage the module?

I have tested the compression 3 more times the third time with a little oil in the cylinder and it was 75psi and about 77 the third time. My earlier reading of 100 must have been an error.

I did notice that the magnet on the flywheel is at about 3 or 4 o'clock when the piston is at top dead centre, but as it is a single cylinder with a keyed crankshaft (I have assumed it is the crankshaft) there is not much room for the timing to be out.

Thanks, hopefully the pictures are there


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If I can get a large enough hammer it will run for awhile just trying to get away from me