SOHC.co.uk Forums > CB750

Electronic ignition

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SteveD CB500K0:
If you want to look at the Dyna S system, go to www.z1enterprises.com

They're a good price and the exchange rate is good too.

Jeff Saunders (the proprietor) is a member on sohc4.net and is a very knowledable and helpful chap.

Waggles:
For what its worth I am in the non electronic camp. As K2 says for starting etc a well maintained and set up points based ignition system is more than good enough. When I first got my F1 on the road I had a fault where 2 cylinders stopped firing ( turned out to be a loose wire connection ) but in my lunchtime investigations I went through everything but didn't have any feeler guages and set the points by eye. When I got home I found ( obviously ) everything was way out, timing and dwell angle but the bike started OK and was rideable.

There is no doubt that electronic systems are better and require less maintenance, so by all means get one for those reasons but I don't think you will see much benefit in starting, look to the carbs as has already been said.

K2-K6:
To add a bit more, I think either std or electronic switching is fine on these motors and wouldn't mind using whichever but if you are chasing a particular problem then in my experience you can spend money converting and find no improvement so still be puzzled by it.

Undoubtedly if you run a weak mixture (classic F2 at low throttle) then having a really decent spark should always help to ignite the mixture reliably, but if the problem is caused by something then you'd probably have to get that sorted anyway.

As most people do with modern vehicles we all really use electronic systems now, but the only time I've had an engine stop for ignition was a car one on which the amplifier failed, it's not relevant to the F2 starting though, only as a longer term over view really.

p@ul:
Thanks for the replies fella's... Some useful stuff to work on there. I was in the garage last night scratching my head at what to to first ( mechanically inept ) so i took the air box out, cleaned the plugs and inspected the points which all looked fine with out gapping them.  I started her up and while it took a short while to kick in, not half as bad as before, it seemed to hold a fast idle on choke a lot better. Am i right to suspect the idle/primary jets need looking at ?. It still misfired when i closed the choke though but i guess i didn't leave it long enough to get really warm before closing it i guess.

Yoshi823:
I used to run Andrews coils, NGK D8EV plugs & Boyer-Bransden electroic ignition on my CB750F2 special & never had any problems in hot/cold/damp/wet weather conditions. The pilot jets were never messed with despite S&B conical individual filters, but the float heights were decreased by 0.5mm to make things slightly richer off idle. The needles were raised & main jets from a CB750K7, which were 117.5s, worked perfectly.

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