SOHC.co.uk Forums > CB500/550

500 Four ignition timing

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Bryanj:
The two advance units are different manufacturers but both 500

deltarider:

--- Quote from: bobv7 on July 14, 2020, 04:49:35 PM ---Mine looks a bit different to that but the numbers seem to be the same?
(Attachment Link)

--- End quote ---
Yours is a Hitachi, ours is TEC (Toyo Denso). Now the one in the pic seems to be (re)assembled incorrectly by a 180o. I have understood the little carve in the rim is supposed to face the Hitachi logo.

JezzaPeach:
I have just been doing the same. Mine is the Hitachi and the notch is on the opposite side to the hole in the plate. However I’d follow the advice to examine the cam etc, as it occurs to me there may not be a fixed ‘rule’ having seen the forum pics although in Ash’s pic of 4 different sets the Hitachi ones are like mine. I did try it the wrong way and of course the timing light lit for the wrong set of marks. Simple and quick to switch back anyway.

My big question is does anyone find the central bolt and hex ‘special washer’ go off centre a bit on final tightening. Mine does by a mm or two POSSIBLY due to a very slight bend in the assembly due to it being dropped in the past. (The washer was scraped so it certainly happened)
However it sets ok and is running very well touch wood, and maybe this slight ‘off centre’ is normal up to a point ? and either was not likely to eg cause vibration

Bryanj:
The bolt and washer should not go off centre all you are doing is tightening twobparallel surfaces to a flat one

bobv7:
Right. Looks like I put the cam back in 180 out so that the timing lamp went out instead of coming on. Just back from the garage with aching knees having corrected this. Lamp comes on just as the points open as I expected it would. Lesson learned, and next time put the bloody bike up on the bench instead of crawling around on the floor! :o

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