SOHC.co.uk Forums > CB500/550

Repro coils

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deltarider:
I might mount my stock TEC coils again. Measurements are OK. Primary around 4,5Ω, secundary around 14,8kΩ. Static test shows spark jumps 7mm easily. Is that enough for reliable results, or can you expect problem because of age and miles? Decades ago I have replaced them by Dyna coils (for the wrong reason). I estimate that before removal my oldies have served around 70.000 kms.
Anyone experience with repro coils? DS offers: DAFAB-300-003P. It doesn't state primary resistance.
https://www.davidsilverspares.co.uk/parts/by-part-number/partnumber_30501300003P/

Bryanj:
As I said on the US site there seems to be a fixation about changing coils, all your numbers are good so why waste cash. the only thing that goes wrong with them is the leads and Ash has an excellent write up on how to repair those

philward:
Plus one with Bryan's view on Ash's coil fix/lead degragation. Plus, I had 2 aftermarket coils fail (split due to overheating) - I used Ash's fix on 2 of my SOHC's with good results

deltarider:
But... there's nothing wrong with the leads of my TECs. The question is: do correct measurements really tell it all? Here is why I ask this. The Dyna coils that I run now, also show perfect measurements, but when I connect the strobe to either the #1 or #4 lead, there's an occasional miss, where the coil 2+3 is constant and shows no misses. I have no idea if just one fouled plug in a wasted spark coil system, or just one HT lead that isn't connected a 100%, not noticed at first, can slowly terminate a coil? Will a miss on #1 always also show on #4, strobewise? What are your views on that?

K2-K6:
Are you still running the Honda advance and retard unit?

If so, you could assemble it 180 degrees out (to make it wrong) then swap the two switching circuits to make it correct for firing. It would switch each coil with the opposite primary circuit and let you see if the miss stays in place or switched with the orientation.

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