Honda 4518 Hi Pitch engine noise

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Honda 4518 Hi Pitch engine noise

David Cadwell	When I start my rider i get a high pitch noise. If I engage the the mower deck the noise goes away. It doesn't appear to be a pulley of any kind. Noise is coming from engine somewhere. Engine seems to run fine. Needs carb rebuilt but runs good. Any advise? Thank you in advance!
Tom C	If the clutch isn't fully disengaging it can make some noise. Can you tell where the noise is coming from? A mechanics stethoscope can be big help to locate the source, especially if it as a bad bearing. Or it could be an intake air leak. Do you hear the noise at idle and at high rpm? You could spray around the intake manifold area with carb or break cleaner to see if the engine rpm increases. Tom
Radical Puffdaddy	My 4518 just started doing the same thing this spring. I am wondering if it is a bearing in the blade engagement clutch. Any ideas ? Solutions ?
Radical Puffdaddy	I just looked up the PTO clutch(blade engagement clutch) in the service manual and there is a radial ball bearing in there. I believe that might be it. Can anyone validate this ? Thanks.
Radical Puffdaddy	Sure enough, I tore in to the PTO clutch and there are 2 bearing in there. The one up front on the clutch itself looks like it can only be replaced with a new clutch. The other bearing, farther back, looks generic and can easily be replaced. The one on the clutch for mine was definitely bad, the other one farther back was smooth, but had one rough spot so I will replace them both.
RadicalPuffdaddy	Well I replaced both bearings and that solved the problem. The bearing in the clutch can be replaced by drilling the rivets out, then using bolts to put it back together. Mower runs as quiet as ever now.
RadicalPuffdaddy	Forgot to mention, the clutch from the dealer was $325 big ones, the bearing was less than $20.

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