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The revs is only at 9000 rpm's wen its sounds like it's over revving.

Looks like the problem is with the engin itself. I put another engin on and it runs fine now.

Hi. I have a Stihl Fs450 brush cutter I'm busy repairing. I did a full service on it and also replaced a few parts that was damaged. When I was busy fine tuning it at a certain point it makes a hollow sound when I open the throttle before picking up revs. What can be the cause? And also when...

It's fully open. I tried it fully open, half open and about less than a 1/4 open. Is it possible that if the shaft is not 100% straight that it can cause this problem? I took off the whole engin nowan saw that the shaft is a bit skew.

I tried what you said and nothing changed. My boss baught a new carburetor, he thaught it was the problem but still same problem.

I have no idea. The client send us a few lawn mowers that was standing in a store room for a while and yust told us to fix as many of them that is possible.

Here is the photos

Here is a few pictures of the carburetor and the springs when on idle and full throttle.

Sorry forgot to mention, I also cleaned the fuel tank and hose and checked the fuel filter and was still fine.

Yes I did. there is only one gas hose it's fine. I cleaned the carburetor, changed the seels on the carburetor, cleaned the exhaust, put a new spark plug, the compression test was good, did a spark test on ignition coil had good spark.

Hi. I have a push lawn mower with a Yamaha MT 110 engin. I just finished servicing it. It runs fine with no blade. As soon as I put the blade on it loses power and runs on low revs even if I it is on full throttle.