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The carb was back from being ultrasonically cleaned yesterday. I fitted it and the initial results look promising. But more importantly it does not stall when the blade is engaged. I only tried it a couple of times so the proof will be when it does an entire lawn including stopping to empty...

Yeah I noticed that. Looks like larger ones are easy to source but 3/8" not so. I will heed your advice. Will let you know tomorrow.

Just looked at my parts list and there is a Welch plug shown. A google search shows that this is to do with the idle circuit. Sadly the screw is not shown but think I saw a plug like this in the float chamber. Maybe the screw is beneath. I will have a look tomorrow and let you know. Cheers...

I will try the finger on the screw thing. I will also look for a screw and take some photos if I can. As I said I think that while I have the carb off and stripped I will get it passed through the ultrasonic cleaner again just for good measure. By the way what is the other end of the governor...

Wow. Thanks for fast replies, John. If I remember correctly there are two or three 'jet' holes on the air filter side. One is inside the choke flap. To be honest I have my doubts about this one being clear as my tiny copper wire didn't seem to go to the full depth. This jet hole goes in and...

I can see the throttle stop screw. The arm is being held away from the screw by the governor. If I gently push the governor rod the revs drop but increase again when I let go. Yes the revs are high when engaging the blade.

Today I stripped the carb as best I could. Basically this means removed float bowl and float inc. needle. Then I cleaned out all the jets as best I could without compressed air. I did use a very thin strand of copper wire bearing in mind that the jets are prob brass or ally. I did not touch...

My hearty thanks once again, John. I will check the gap and try stripping the carb and cleaning it myself as best I can. I will of course let you know how it goes.

Looking at the suggestions from John and Mike above here goes with the continuing saga. The blade moves freely when the brake is disengaged. The governor does do something (will discuss later). I changed the fuel filter. The old one did not seem to restrict flow but I changed it anyway...

Another brilliant idea gratefully received. Thanks, Mike. The weather is a bit rubbish here in sunny Norfolk at the moment and looks like continuing this way for a couple of days. As I have to work on it outside by kneeling on the grass I am a bit stumped for now. In the meantime I have...

Hi John, thanks for your post. 1. Drive belt and brakes I will check tomorrow (weather permitting) although I feel everything is ok there as I have recently changed the blade. 2. The governer I know nothing about except that it is to do with the two little springs above the carb. Should...

Hi all, After getting my Mountfield 725M with Briggs and Stratton engine out after the winter it struggles to keep running during engaging of the blade. The lever has to be pushed forward carefully and sometimes the motor will stall. This is not due to safety switches. I suspect the blade...