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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...

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.