SOHC.co.uk Forums > CB350/400
Odd spark problem
Northy:
Ok had ride in the freezing cold with the ally points cover on but with insulation tape on the inside, managed 16 miles running Ok. Should have done some more miles but it was cold !! ::) so it may not have got "hot" enough to be proper test.
So its appears for some reason when warm/hot the points sort out against the cover ?? this seems odd to me.
However one bit of logic is that points for 2/3 cylinder are closer to the cover than 1/4 and that's the one that fails.
So I've learn't something new .......or the garage fairies are having a laugh. ;D
taysidedragon:
--- Quote from: Northy on January 24, 2020, 12:49:49 PM ---Ok had ride in the freezing cold with the ally points cover on but with insulation tape on the inside, managed 16 miles running Ok. Should have done some more miles but it was cold !! ::) so it may not have got "hot" enough to be proper test.
So its appears for some reason when warm/hot the points sort out against the cover ?? this seems odd to me.
However one bit of logic is that points for 2/3 cylinder are closer to the cover than 1/4 and that's the one that fails.
So I've learn't something new .......or the garage fairies are having a laugh. ;D
--- End quote ---
I'd guess that the new aluminium cover is thicker than the original chromed steel cover and that could put part of the inner surface closer to the points. Without any insulation there would be an increased chance of a short. Heat expansion of the metal might just put it close enough to make the difference?
K2-K6:
Just a theory, but it may be air ionisation within the covered area altering the relevant conductivity surrounding the points.
Start it in the dark and look to see if one set of points shows more sparks, 2/3? And maybe the performance of that condenser is not as efficient as the others.
If that were the case and conductivity changed during use, it may just swing it such that the one set is jumped and effectively results in the coil not switching.
Looks like Honda where onto it with their original coating of these covers anyway. There's so many of these very small details on Honda bikes over the years, almost exist invisibly until removed and you see why they were there.
AshimotoK0:
--- Quote from: Oddjob on January 24, 2020, 09:52:23 PM ---I thought the paint inside the cover was zinc paint to prevent the inside of the cover from rusting. I've used a LOT of zinc paint in the past and it looks identical to me.
--- End quote ---
It's has a cement like filler in it . Not sure its for electrical insulation or sound deadening to stop 'ringing' I guess the latter because on the CB250/350K the tacho cam bearing cover has that coating and has no electrics inside of it.
paul G:
I thought it was for ringing Ash. Has anyone had a meter across it.
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