SOHC.co.uk Forums > CB500/550

Timing of cam chain correct? (solved)

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McCabe-Thiele (Ted):

--- Quote from: Bryanj on April 08, 2022, 12:28:24 PM ---The reason why is that with plugs in you can easily break the "ears" off the cam and elongated the hole the locating pin fits in. I have seen both but never done it myself.

With no compression (plugs out) it ought to be safe to use BUT putting that caveat in an explanation people either dont read, dont understand or dont care.

How many owners of cars with broken cam belts have ignored the OR FIVE YEARS bit

--- End quote ---

What do you mean by "breaking the ears off the cam" please Bryan?

Oddjob:
There are 2 ears on the advance/retard mechanism Ted, these are so the nut locates properly and allows the nut to turn the mechanism if required, if you force the nut there is a chance these will shear off.

I regularly used to use the nut to turn the crank, hard not to when your watching the points for opening/closing etc but I always removed the plugs first so the effort required was much less.

I ditched the bike one night coming down a steep hill with a 90 degree bend at the bottom, the council had tarmaced over cobble stones and they was an area where they were exposed, I didn't see it in time and being cranked over to the max the bike just went away under me, skipped up a kerb island, through a bus shelter, luckily one of those sheet metal types, scattering the waiting queue who were luckily watching me rag the 500 down the hill (I was young and an idiot), fell off the kerb island into the bus stop and stopped. I was already walking toward it before it stopped, picked the bike up and the points cover was mashed flat, removed that and spotted the advance/retard mechanism was bent to hell and back, removed the bolt, smashed it flattish and reassembled everything whilst bleeding all over the floor, bike started on 2 cylinders but got me home. Second hand mechanism later and good as new, really built these bikes to take punishment. The ears were still ok though so it takes some force to break them off.

deltarider:
The steel of the ears is much harder than that of the WASHER,SPECIAL (Hondaspeak for that nut, PN:30233-300-000). I've learned about risks turning that nut on the CB750, but the CB500/550, mwah, if you do it with care...

Bryanj:
Its is harder, but they still break off seen quite a few after owner maintainance done wrong.

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