SOHC.co.uk Forums > CB350/400

Odd spark problem

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paul G:
I thought it was for ringing Ash. Has anyone had a meter across it.

Lobo:
... I dunno Northy, but my gut feeling is you’ve a gremlin rather than a localised heat issue. My reasoning is that these bikes were sold worldwide, and operated in far higher temps than you typically see in the UK. (and you’re experiencing this issue in winter)
Furthermore, they’d have been raced / hammered / two up climbing hills etc -  surely a heat problem will have reared its head and be well known 40 years ago... even with the OEM cover.
We need Ash to arrange a thermocouple by the points for each of the two covers!

Bryanj:
I distinctly remember having to put insulating tape inside 250 K4 point covers to stop them shorting out a set of points, perhaps pattern points are a bit close to an aftermarket cover?

Northy:
Just done 40 odd miles and no issues .... so it "fixed" .

However as lobo says   "gut feeling is you’ve a gremlin rather than a localised heat issue. "   

Next step I suppose is to remove the insulation tape to finally prove it. That will have to wait ...need to clean the bike now, rather grotty roads out there today. 

Lobo:
... a bit obvious, but this weekend I swapped a duff Newtronic ignition out for a new Boyer. What I noticed is where the blue / yellows exit the case, there is a sharp edge to the OEM cover which could conceivably chafe the wires. (My grommet is not OEM). Have you got an issue in this area, and in switching covers promoted the issue?

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