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1976 CB550F1 (what have I let myself in for) Project
eight0:
They were drawn with earth's on the revival cycles diagram. I assumed the way they bolted to the frame handled the earth anyway.
Don't think I'm going to run a clutch or kick stand switch.
Bryanj:
Didnt have a kickstand switch
Lobo:
Hey Bryan,
Certainly on the 400F the HT coils are not earthed to the frame; I’ve my bike in bits at the mo and your post intrigued me so I bloody had to isolate them (!) - and sure enough it runs with them sitting on a rag.
I’m guessing it’s due the dual spark build nature.
An ohm meter across earth and a plug gives open circuit, and across the both plugs gives abouts 22kOhms.
Simon
Bryanj:
Correct Simon, one of the other Japanese big 4 had it in their service schedule that when sparks plugs were cleaned at 6,000 miles you should swop 1&4 and 2&3 over to even out erosion wear as one plug sparks from the centre electrode to earth tang and the other one from earth tang to centre electrode. I have no idea if this is true and we never did it just fitted new anyway
eight0:
Interesting. I won't be grinding down the powder coat where the coil mounts bolt to the frame then.
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