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Teds new project a CB500 K1 mostly version 0.5 circa 1972.
Laverdaroo:
--- Quote from: Oddjob on September 08, 2023, 11:23:52 PM ---Now what would you know about being human Roo?
--- End quote ---
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McCabe-Thiele (Ted):
Over the weekend I fitted the cylinder head using the 12 flat washers & a few new head nuts kindly supplied by Ken all torqued up without event. I decided to leave the fitting of the camshaft until today so this morning revising my plan from the workshop manual & some tips here on old posts I tried to fit the chain.
I failed completely to get the chain to fit on the sprocket after 40 odd minutes of sweat getting hot & botherd so I gave up. I knew the old chain was a snug fit so my new H/D chain would be difficult. I had pub lunch with my little brother. (At lunch I was going through areas in my head that could be a cause - chain too short, tensioners not fitted correctly, self doubt starting to depress me).
At about 6.00pm this evening I decided I would have one last go for today so I did something slightly different that I suspect is of significance as the chain/spocket are now in place with the valve timing checked as per the manual.
Sorry if this is obvious to the experienced members this is what I did. Cam chain had a cable tie through it looped over the top of the frame, likewise the sprocket had a cable tie through one of the bolt holes. Crank timing marks was at TDC 1/4 position.
I then started to feed the camshaft from the right side of the engine but put the chain over the camshaft first then started to thread the camshaft throught the apatures in the sprocket until the sprocket was in place but not fully seated on the boss (cable ties removed when no danger of chain or sprocket falling into the engine). doing it from the right side - this gives you some slack - I made sure that the chain was in the right position for the two bolt holes to line up with the camshaft end marks in the right position. Checked that crank still at TDC. It is quite easy to rotate the sprocket with no chain yet in place checking the camshaft timing mark is where it should be. So visually if the chain was on the sprocket the valve timing would be correct if you get my drift.
For some reason with the chain to the right side of the boss this enables the chain to be fed onto the sprocket by hand. All that remained was to give the sprocket a little bit of leverage from the left side through one of the appertures that then lifted the sprocket onto the raised boss - bolted in place making sure a cloth covered any chance of dropping a bolt down the chain tunnel. It went on a treat - my earlier failure was starting with the chain on the left side of the sporcket so somehow doing it from the right side worked.
Sesman:
Ted. You explained that far better than I ever could. Buts that’s exactly how I installed mine. Glad all is coming along well. It will be firing up time soon.
royhall:
They are a very tight fit and only go together the way Honda designed it. Can be a bugger working it out.
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Oddjob:
So let me get my head around what you've said Ted.
You've essentially threaded the camshaft with the cam sprocket hanging loose on it through the chain, with the engine at cylinder 1 TDC, T mark 1-4 lined up with notch. You've then turned the camshaft so the slot is flush with the head surface, then sort of aligned the cam sprocket so that if you were to fit it now it the bolt holes would line up. Then mounted the chain onto the sprocket and then levered it onto the cam, bolt holes lined up, slot was still aligned and crank hadn't shifted.
If that's so then that's exactly how you should do it. I seem to think people are trying to fit the chain onto the sprocket with the sprocket mounted on the cam and that's not possible, not unless the chain really stretched that is.
It's fit cam through chain, mount chain onto sprocket and then fit sprocket onto cam, IF the holes don't line up then work out how many links you need to move so that they would, dismount sprocket, move chain and try again. Most times you're a link out.
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