SOHC.co.uk Forums > CB750

Aftermarket Coils

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philward:
Thanks Bryan - Just touched button and within 5 seconds we are up and running! Got bike out to test down our cul de sac and no gears!
then I realised that I hadn't yet  fitted the chain! Chain fitted and bike rides ok with a few tweaks. Clutch a little jerky and thats the only engine part I didn't replace (I normally replace on all my builds but on this occasion, decided it looked ok) - I will put a new set of springs, friction and steel plates in over coming weeks.
So, just need to sort painting when all this lock down ends - and make up a seat cussion for my missus to sew up on her machine.
Always good to get the engine going after an engine rebuild!

philward:
Electrical guru's knowledge needed! As per last post, got bike started straight away with teplacement coil (while on with original Honda  coils refurb). Neutral light on in all gears so whilst doing a continuity test on the switch with ignition on, (few minutes) heard the sizzling sound from under tank - as per original coil problem - and on lifting the tank, the other (remaining coil from original aftermarket coil pair) has a gaping crack as per original post oicture. The replacement coil (a 'Hendler') wired into the same position/circuit as previous defective coil is fine. Bike runs with coil split (although I obviously won't run it from now on).
Is it a bad batch of coils (ie, both original  aftermarket coils) that account for failure or can something on the bike be causing the problem? Need to establish this before fitting the original Honda refurbed coil set in case they are detroyed.
Thanks in advance
Phil

AshimotoK0:
The coil should be able to  withstand 12v across it for a considerable time without any damage. I think it's either a defective coil or a coil intended for CDi electronic ignition.

philward:
It does seem strange that both the original aftermarket coils on different points circuits have failed - as long as its not an issue with the rest of the bikes ignition circuit. They were bought from a reputable firm (M&P) who should know that a CB750 does not have CDI (or maybe not!)

Bryanj:
I would gues either a  bad batch or wrongly labled batch

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