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Knocking Sound Diagnosis Help


TommyB

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Hi everyone,

 

I posted a while back that my Honda vfr1200f had a bad driveshaft which was strange as it has had the recall done. The mechanic originally thought it was the driveshaft because the bike has a loud irregular knocking noise when put into gear and the clutch is let out.

 

It turns out after taking the bike apart the driveshaft is fine so I asked them to check the backlash in the pinion gear and they just said there is no wear on the gears so it can't be that.

 

Does anyone know if this could be the engine or transmission? Honda seem to have given up (I guess it's too much work for the investigation fee) and I'm not sure what to do now. I can't seem to find any engine/transmission noises that match the sound.

 

I really appreciate any of your expertise in this matter.

 

 

 

 

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Hi thumbs. I'm hopefully getting the bike back from Honda on Saturday so I will do then. I wanted to do this sooner but they've had the bike in for nearly three weeks. 

 

I'll get back to you with the recording.

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To troubleshoot an internal noise the first step is to establish the
rate at which it occurs... is the noise in time with the camshaft or
crankshaft??? camshafts rotate 1/2 the speed of the crankshaft...
possible source of camshaft speed noises are shim and bucket
clearances... loose cam bearing blocks... broken valve springs...
possible source of crankshaft speed noises are a scuffed piston...
stuck piston ring... rod bearings...

 

To pin point the exact location of the noise hold a long tip screw driver or a
length of garden hose up to your ear and probe the suspected area...

 

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