SOHC.co.uk Forums > CB350/400
400 four whistle
Piki:
--- Quote from: Oddjob on September 13, 2023, 03:31:29 PM ---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.
--- End quote ---
The noise is noticeable when the engine is under load, let me explain: it is especially noticeable when you release the clutch, at which point the whistling starts, if you put the motorcycle on the center stand and shift into gear it doesn't make any noise, it only does so when the engine has a load, there are examples on YouTube.
I think you are right, the change must be for the complete assembly, both pinion and clutch basket, I want to imagine that it was just a coincidence that the person who only changed the gear was lucky enough to compensate for the wear......but it makes sense. It is changing both parts at the same time.
https://youtu.be/iXgtJOfHwiI?si=mfWATtw36hh25kK5 (example min 5:14 to min 5:30 you can check that noise)
Piki:
--- Quote from: Deano400 on September 13, 2023, 04:25:24 PM ---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.
--- End quote ---
I think that not..........I have adjust the primary and the sound continues....
Athame57:
--- Quote from: Piki on September 13, 2023, 10:42:46 PM ---
https://youtu.be/iXgtJOfHwiI?si=mfWATtw36hh25kK5 (example min 5:14 to min 5:30 you can check that noise)
--- End quote ---
It really sounds like when I over tightened my cam chain, by the same path as Deano! ;D
Piki:
--- Quote from: Athame57 on September 13, 2023, 11:22:42 PM ---
--- Quote from: Piki on September 13, 2023, 10:42:46 PM ---
https://youtu.be/iXgtJOfHwiI?si=mfWATtw36hh25kK5 (example min 5:14 to min 5:30 you can check that noise)
--- End quote ---
It really sounds like when I over tightened my cam chain, by the same path as Deano! ;D
--- End quote ---
:o :o I will look at it again but if it were the timing chain it should make a sound whenever the engine was running since it is spinning continuously......and the sound only occurs when you shift into gear or when you reduce a gear... .. In addition, the adjustment is made automatically by loosening the tensioner screw....
Athame57:
--- Quote from: Piki on September 13, 2023, 11:27:09 PM ---[In addition, the adjustment is made automatically by loosening the tensioner screw....
--- End quote ---
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.
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