SOHC.co.uk Forums > CB750
Hopelessly unreliable these CB750's
hairygit:
Just a thought here, are you using points or electronic ignition? I knew a guy with a 400/4 with electronic gave similar issues, only when hot, turned out the pick ups were being affected by the heat in the points cover, causing massively increased electrical resistance. That's why superconductors work best at the coldest they can.
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MarkCR750:
Electronic, the original Piranha set up that came with the donor bike, it must be 20+ years old as the previous owner took it off the road in 1995, so you could be onto something there H, I believe that the Newtronic set up is pretty much the same as the old Piranha so maybe it's time to invest in a new one.
hairygit:
If you have the stuff to try it with conventional points, give that a try before spending loads when it may not be the issue, or maybe there are shitalian components in the electronic system! (Couldn't resist that!)
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K2-K6:
Take a spare plug out with you and if it does it again you can check for a spark there and then on any of the cylinders to see if the ignition isn't working or it's something else.
My dad's friend always just put his finger in the plug caps to check for sparks years ago, proper old mechanic's fingers he had.
flatfour:
The Newtronic system fitted to my Benelli 750/6 would do exactly as you describe - run perfectly for many miles (sometimes as much as 2,000 miles went by between failures) and then stop producing sparks, only for it all to work normally again a while later.
It's the only bike that I've ever owned that went home on a trailer (twice).
The problem would, when it occurred manifest itself after a short spell of idling (i.e. at traffic lights). Things would then return to normal after everything cooled down.
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