SOHC.co.uk Forums > CB350/400
400 four whistle
Piki:
--- Quote from: Athame57 on September 13, 2023, 11:48:12 PM ---
--- 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.
--- End quote ---
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?
K2-K6:
--- Quote from: Piki on September 14, 2023, 09:29:00 AM ---
--- Quote from: Athame57 on September 13, 2023, 11:48:12 PM ---
--- 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.
--- End quote ---
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?
--- End quote ---
If you run it with the pinch bolt undone, then a screwdriver onto end of the rod, push it very, very lightly and you should feel the tensioner oscillations as the chain is going round. If it's completely still, then that suggests its stuck and not fluctuating with chain movement.
McCabe-Thiele (Ted):
On my old 250 Honda if I undid the tensioner bolt & removed the end bolt a slight blip of the throttle would make the tensioner move visually in & out. Not tried it on a 400 though.
Oddjob:
It could well be Piki that the chain is overtight, when the engine is just spinning over it's not a huge problem but as soon as the engine starts to load up then the chain does as well, this causes it to overtighten to the point where it's stressing the others parts, the tensioner blade, the chain itself and the guide, even the horseshoe.
Not saying this is the case but it's feasible.
IF it is this you need to sort it before something snaps, if the horseshoe is stuck you may be able to get it unstuck through the sump, not enough to fix it but maybe just backing it off a little so it doesn't make the chain whine. It will need sorting at some point though, sooner rather than later.
Bryanj:
Big problem with all the adjusting is you keep burning your hands on the exhaust, i have put up several times a link to knocks and rattles mod kit for the tensioner bolt which whilst it does not free the horseshoe or make the plunger free is a well made stainless kit to repair the lockbolt and no i do not have anything to do with the firm
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