SOHC.co.uk Forums > CB750

Running rich

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adrian58:
Will the H/T leads be long enough to swop ? Didn't think about L/T leads and connectors. When you say the one at the back of the motor where is that ? Can get a new aftermarket coil for £20 but will look at all the things you said first. Just seems odd to me that the previous owner (who seemed to know his stuff) stripped and set the carbs with 2+3 being  pretty much spot on and 1+4 way out. As for the plug caps, one has been changed at some time and thinking that 1+4 are more exposed to the elements. Can the resistors break down  in them ? Thanks again for all your help. Adrian.

Yoshi823:
I had Boyer-Bransden electronic ignition on my CB750F2 & the only time that I ever had problems with it was when I binned the bike on the right side & the Rickman engine bars bent & partially severed one of the two wires going from the points side up to the wiring loom by the removeable engine mount by the clutch cover. I never suspected that as a fault until one day it wouldn't run on all four at all. I buzzed through from the ignition back plate to the end of either the yellow or the blue wire...I forget which as it was back in the late '70s, & lo & behold I found the break. I bought a second hand shrouded pair from a breakers & that was it...sorted.

At one time I visited the small factory of Boyer-Bransden when they were situated near to my work at Elmers End. They said that in the vast majority of situations it was a connector problem with their system & not a fault of the black boxes themselves. In all of the years that I had it fitted to my 750 it was faultless.

adrian58:
Found at least one very dodgy connection (fell apart when I took the tape off). About 4 others with crap connectors so going to renew the lot. Can't understand why previous owner spent £100 + on a Boyer then for the sake of about £2 fitted crap connectors. Pretty sure it's either a connector or the coil not the Boyer.

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