SOHC.co.uk Forums > CB500/550

measuring the cubic capacity with head on

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duzatun:
been spending a lot of time on the 550, now before i bought it i was told somewere down the line a 610cc kit had been installed but im not sure of this and removal of the head to try and find the problem i have of number 3 plug running very black and do valves and check pistons and rings etc as i cant find anyone who can supply a gasket to suit the 610 cc means if i pull the head off and it is a 610cc i cant put it back together any one have any ideas on measuring the cc  or  bore width  without head removal or a contact for possible supply of such a head gasket
i have inquired david silvers and jerry collins with no luck

Bryanj:
Cometic in the US will make a head gasket with any bore you like. I'm afraid the only way to be certain is to pull the head and measure the bore, most of the 610 kits had one piece scrapper rings which do let oil past, it is possible to modify the piston grooves, or rather have them modified, to accept 750 four standard size rings and fit the 3 piece ring.

You need to run this for a while and find out if the black is oil or fuel related before going farther

duzatun:
bryanj
is the difference between oil and fuel related wet black for oil and dry black for fuel as i have rebuilt carbs and thought maybe swapping floats from another carb into no 3 to see if problem went with floats from that carb 3

Bryanj:
Easiest way is to run it and check how much oil you need to add and get a miles per pint reading which should be a really high number I.E at least 400MPP

matthewmosse:
I'll have a headscratching session, someone on ebay was selling cb550- 610cc conversions and had a few. I'll see if I can dig details out for you

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