Re: 929 gives a knocking sound when reving it
i have 2 929 blades, one with only 4000m and the other with 22000.. the 1st has been loved the other has been abused .. but still loved - honest!!
The 4k one has virtually no clutch rattle/noise at idle or when rev'd at standstill, but... does have very bad piston slap/rattle.. this is noticed when accelerating hard.... between 3k to 5.5 k revs the engine produces a rattly sound like it's loose, and the camshaft is not hitting the shims properly, very pronounced and I can't stand it!!
The 22K one has a lotof clutch rattle at standstill but very little piston slap!! so when throttling it it fells quieter and newer than the 4k one.. wierd..
I just hope it is piston slap and not a worn cam belt tensioner!!
Clutch Rattle is normal, and there is no cure short of a new clutch basket.. and that is an expensive item to replace!