SOHC.co.uk Forums > CB500/550

camchain tensioner

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Bryanj:
Sitting for that long can frequently cause rust spots in the bores leading to bad rings and bad piston fit

Murf:
Well after saying there were Specifications for everything, I can’t find any specs for rocker arm end float 🙁. Anyway I have had a good look at a rocker box I am going to use to replace the knackered one on my K1 550, it is the later type with the pinned rocker shafts like the one you should have.

I have checked the rocker end float:- rockers for  2 and 3 cylinders they range between  .012” to .017”

For 1 and 4 cylinders they are .012”
All measurements are in thousands of an inch.

I have listed them as above because the casting in the rocker box for 1 and 4 cylinders is different to that for 2 and 3
1 and 4 have a step in the casting as shown in the photo, so clearances have to be taken on the stepped out area.

I will use this head on my engine and feel it is ok, am I right, I don’t know really, maybe someone could check the clearance on the NOS rocker box they have in their parts sash 😁.

bigmockuk:
i should probably have honed the cylinders,i just gave them a good visual check,oiled them up and rebuilt the engine,as to end float on the arms,murf, i can certainly check n see what their at and compare to what you have.the fact the bike was running fine for the first 100 miles driven at relatively low speeds with no harsh acceleration when this fault developed,ive been looking for obvious things like damaged parts or out of place parts and not really gave thought to worn parts so as theres nothing obviously out of place i`ll need to start checking tolerances in various parts especially rocker gear.

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