Thanks Bigted and Grumpy. I appreciate the assistance.
It might be better to describe the change in engine sound as a light cough which is noticeable from the exhaust. The change in engine rev's is very minimal to say the least
I thoroughly cleaned the carby with compressed air and carby cleaner and then replaced the diaphragm. I also added from PULP to the tank. Everything looked as it should upon re-assembly. I also re-inspected the governor springs and to the best of my knowledge everything looks as it should.
I should also clarify the unit makes the same sound under load and not under load. Although when I cut the grass on the weekend the engine wasn�t under any form of excessive load due to the fact the grass was fairly short.
Would cleaning out the muffler help? It seems to be on very tightly. I don�t suppose you have a trick for taking it off. I was thinking maybe an oil filter wrench.
I will run the engine again tonight for another 20 mins or so to see how it goes.
I did read a separate post which James87 identified the problem could in fact be related to a warn blade bar and a lack of evenly distributed weight however that was some time ago and I could be mistaken. The blade bar hardy has a mark on it similar to the actual entire unit so I don�t think that will be the problem.
I�ll await your thoughts.
Thank you
Peter
