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Ken / Diego. What are your thoughts on this? Something in the back of my mind from 40+ years ago to do with an overtightened cam chain. Done by loosening the lock bolt and using a screwdriver down the top hole to push the rod down. Maybe take it with a pinch of salt as my memory is terrible, as you know Ken.
If the pinion gear is wearing out then surely the gear on the back of the clutch would wear at the same rate? so maybe both need changing? I can't remember ever hearing this sound BTW, so is it present when the engine is ticking over or does it only appear when the bike is rolling as knowing that should point to what it's not and maybe what it is, for instance, if you run the bike up to 30 then shut off the engine does the noise continue, (pull the clutch in to disengage or put into neutral) in which case it's on the drive/gearbox side of things, if it stops with the engine stopping that points to something either on the clutch or before the clutch. I have heard final drive bearings make that noise when they've been overstressed with a really tight chain but not on the 400.
https://youtu.be/iXgtJOfHwiI?si=mfWATtw36hh25kK5 (example min 5:14 to min 5:30 you can check that noise)
Quote from: Piki on September 13, 2023, 10:42:46 PMhttps://youtu.be/iXgtJOfHwiI?si=mfWATtw36hh25kK5 (example min 5:14 to min 5:30 you can check that noise) It really sounds like when I over tightened my cam chain, by the same path as Deano!
[In addition, the adjustment is made automatically by loosening the tensioner screw....
Quote from: Piki on September 13, 2023, 11:27:09 PM[In addition, the adjustment is made automatically by loosening the tensioner screw....Piki, that is when things are as they should be, but the 'horseshoe' is prone to seizing/stiffening and the solution short of splitting the cranks to change it, is to undo the plug at the top and give it a good tap with a screwdriver or similar.
Quote from: Athame57 on September 13, 2023, 11:48:12 PMQuote from: Piki on September 13, 2023, 11:27:09 PM[In addition, the adjustment is made automatically by loosening the tensioner screw....Piki, that is when things are as they should be, but the 'horseshoe' is prone to seizing/stiffening and the solution short of splitting the cranks to change it, is to undo the plug at the top and give it a good tap with a screwdriver or similar.How would you know that the tensioner is working correctly? loosening the tensioner bolt and then applying tension to the top and seeing if it moves freely?