f2cafe racer

[yozzer74]

If I lift the points with a screw driver I get a spark across the points which give me a week spark at plugs .?? Anyone no what's wrong

[Bryanj]

Check the voltage at the points leads when the points are open to see if there is a voltage drop on any connections

[yozzer74]

Ok just checked I've got12.8volts going in to coils and coming out and same down at points

[yozzer74]

Just tryed kicking it with kick start producing a little spark at points then tried starter button now a big spark across 1&4 points and plugs sparking on 1&4 but nothing on 2&3 ??

[K2-K6]

When you lift the points with it all connected yes it should spark.

What the points are doing is controlling the earth connection for the coils, when points open earth is removed and ht part of coil finds earth via the plugs so making a spark.

It's abit back to front as you are sending a current to the plugs by breaking the coil primary circuit so slightly counter intuitive to a conventional circuit if that makes sense.

[hairygit]

The points shouldn't spark much, so how old are the condensors? The idea of the condenser is to reduce sparking at the points and reduce pitting of the points

[yozzer74]

They were on bike when I got it but I do have receipt when po  bought them .it had a new back plate on do you think it would be worth buying new points & condensers

[hairygit]

Have a look at the points under a magnifying glass, the bits that contact each other, if badly pitted then replace them, if not too bad, you can dress them with a piece of wet and dry folded over and pulled through a few times. Out of curiosity were they genuine points and condensors? As the late Bitsa would always rant, buy pattern parts at your own peril, they tend to be crap! It really can make a big difference using genuine parts on the ignition system.

[yozzer74]

The receipt is from David silver's the po bought a back plate with points on so I think there pattern parts

[yozzer74]

Is it worth going to electronic ignition

[hairygit]

Very much a matter o personal preference, personally I wouldn't, but there are many on here who have, and are happy with the result.

[yozzer74]

Well I tried coils off a Gs550 I have .on my bike and I get a spark now on all four cylinders

[Greebo]

Is it worth going to electronic ignition

Definitely, I got mine for Dave Silvers, easy fit starts first push every time [i don't use the kicker, too old for that malarkey]

PS... sent you personal message

[yozzer74]

Quick question  does anyone no how much oil the cb750 holds and what oil do you recommend .think I'm going to after use a little more than standard with size of oil tank

[Bryanj]

can't remember quantity but any 10w40 oil of the right spec but not synthetic. Tesco own brand mineral diesel oil is correct spec