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Teds new project a CB500 K1 mostly version 0.5 circa 1972.
Oddjob:
Check the tensioner has located in the slot in the lower crankcase, then check again just to be safe.
Should also have said to check the tensioner itself, after speaking to another member recently it's apparent a number of these tensioners are actually bent like a banana, caused by fitting the tensioner into the lower slot and then trying to fit the bolt through the barrels, doing it this way can bend the lower part of the tensioner as it's only pressed steel with little structural strength. This causes the blade to bend ever so slightly thus putting more pressure onto the chain than it should and if the chains new that means it's harder to get the chain onto the sprocket and the sprocket onto the cam.
I have 6 or 7 tensioners all restored and bagged, one showed signs of not being in the slot, the bottom edge gets chewed by the primary chain, 4 others showed bends in the lower half of the tensioner, when new the tensioner is straight, if yours looks bent it's because it is. Another way it could be bent is in how it's removed, you remove the nut etc and then try and remove the bolt from the barrels, this can do the damage in reverse. Always lift the barrels slightly before removing the tensioner, just to disengage the tensioner from the locating slot.
McCabe-Thiele (Ted):
Thanks Ken,
The long tensioner blade was nice & straight I positioned it vertical with a gap of around an inch at the bottom. Fitted the fixed guide so it was pivoting at the top - I could see the lower section engage in the recess. I knew the rear blade was in position at the bottom as it did not move sideways when block down- after locking the nut in place with the adjuster screw in the fully back position - top part looks nice & vertical.
Oddjob:
Always pays to check Ted. Saves gaskets if nothing else ;D
McCabe-Thiele (Ted):
As well as the tips here I found the Honda Workshop manual in the download section a handy reminder.👍👍👍
McCabe-Thiele (Ted):
A little more progress all cling filmed up to keep out the dog hairs!
.PXL_20230726_134925498 by Macabe Thiele, on Flickr
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