SOHC.co.uk Forums > CB500/550

Can ignition timing be set without power?

<< < (3/3)

MrDavo:
I found a good picture of my setup on my Z1-A rebuild thread, although the meter face isn't visible due to glare. I'm so glad I ditched those allen screws on the engine, they make my OCD scream when I see them now (actually I'd rather have CDO, same condition but with the letters in correct alphabetical order) ;)

The motor has been turned so that the pointer aligns with the 'F' firing mark, which you can just see through the oval window at the top of the points plate, red wire is connected to the feed wire to the right hand set of points (white wire). The other lead on the meter goes to earth on the engine, anywhere handy will do.



First set the points gaps, as doing it later will beggar up the timing again.

The meter is set to 'resistance' - when the points are closed no resistance, when open infinite resistance. I then turned the points plate to get the needle bouncing around as the points just open. Tighten the back plate. Switch the red probe to the other set of points (black wire), turn the motor 180 degrees to the 'F' mark for the other set of points, and repeat the process but using the individual adjustment for that set of points rather than turning the backplate.

Do double check afterwards, as things can change slightly when you tighten the screws up. Once I'd finished the bike, I checked the timing with a strobe, but it didn't need any further adjustment, so I'd got it spot on. :)

I had three pre unit BSA twins over the years (a glutton for punishment, I know), no timing marks but used a suitably marked pencil in the plug hole to find the firing position, and then the fag paper trick to set the magneto to where it was just letting go of it. Tighten the magneto onto its (tapered) shaft and I was good to go.

K2-K6:
I use one of these for most things https://www.ebay.co.uk/itm/303777478353 and have a couple, one in my general service rucksack pocket, one in an old car just in case diagnosis is needed  :) often used when on a campsite to diagnose non starting from people flattening batteries etc .

Brilliant design and size, only complaint is that the built in leads aren't over long, but mostly you can reach things to test.

Navigation

[0] Message Index

[*] Previous page