SOHC.co.uk Forums > CB350/400
Strobe
Bryanj:
To work on a bike they must be able to work on a seperate battery and few inductive picups work well, dont know why.
When at Mead and Tomkinson we had the Honda " box" that had meters for dwell, volts, capacitor plus a coil tester and a strobe all powered from a large car battery we charged weely. Only ever used the strobe once to prove a CB400N was advancing too far(holed piston) always did static timing with bulb as in 750 manual.
Problem is as you move points plate to adjust timing gap alters as well and it is way too much faf with strobe.
K2-K6:
https://www.zoro.co.uk/shop/automotive/timing-tools/advance-timing-light/p/ZT1120553X?utm_source=google&utm_campaign=pla%2B%7C%2BAutomotive&utm_medium=shopping-pla&mkwid=dAYVX9ix-dt&pcrid=240096058921&prodid=ZT1120553X&pgrid=51826823924&ptaid=aud-640926587692:pla-395235818101&productparam=zt1120553x&gclid=EAIaIQobChMIkZj0_ue66AIVwojVCh1OdgV7EAQYDSABEgJ3cfD_BwE
A friend of mine uses this one to good effect (I've got an old sun one so don't need new) it's also sold as Gunson for twice the price.
I've not had a problem using them powered by the vehicle battery, possibly that has something to do with design circuit? on some examples.
Lobo:
I’d rate the strobe any day over alternatives as you can set the timing with the engine running. My strobe happily uses the on-board battery; sorry Oggers, it’s so old I’ve no idea what it is. (tho’ an in-line HT connection & not inductive)
Brian, how does the gap change given you simply rotate the back-plate about the spinning cam - are you simply referring to the ‘slop’ in the back plate mounting?
K2-K6:
--- Quote from: Lobo on March 27, 2020, 09:50:30 PM ---Brian, how does the gap change given you simply rotate the back-plate about the spinning cam - are you simply referring to the ‘slop’ in the back plate mounting?
--- End quote ---
If you rotate the crank until the cam only just touches the heel of the points to start lifting them, then try changing the points gap, you'll see it can delay or advance the timing according to how far you moved the heel into or away from the cam.
If that makes sense :)
Bryanj:
Because the plate is never a perfect fit in the mounts and can move sideways a fraction, same for 2-3 plate on big plate
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