SOHC.co.uk Forums > CB500/550
Carb tuning with all original brass!
K2-K6:
They're not that difficult to make, and can be done with minimal tools.
You'd need piano wire (basically spring steel) in same gauge as original.
Bend a right angle into one end, enough that you can form a loop like the original (just leave straight for now) clamp that tail along a small bolt that is sized to go inside the original spring coil bore ..... now wind the other part of the wire around the bolt to form the coils. Count how many you need to make factory spec.
At the end of coils, form another tail at right angle to coils. Then you can bend both tails into the spring ends needed to attach.
Finally, heat to cherry red (just a gas ring, camping stove type will do) and drop into cold water, this will harden the spring steel to make it ..... spring.
Don't stretch it, as it now needs tempering to remove brittleness. Heat again to cherry red and just let cool without intervention. Leave for a day, then temper again .... should now be usable.
DomP:
Thats brilliant info, thanks I'll look for some spring steel and try it, nothing to lose!
DomP:
From looking through Google images it seems they have 9-10 coils when new
DomP:
Look quite stretched!
*before cleaning!
deltarider:
This whole 'sloppy springs' thing is another made up or should I say exaggerated problem. As far as I remember it has been more a CB750 thing. Yes, they can stretch overtime, but heat annealing? Really, at such low temperatures? Here's what you can do if you do suspect weak springs, which can cause a bit of fluttering idle. A stroboscope will help you determining it. But be aware that a fluttering idle can have more causes! When fully advanced, there's no problem and that's where your bike is most of the time. If you have the advancer out, press lightly with your finger sideways to the spring to estimate the play. If you find them too sloppy, you can tweak the loop which goes around the post a bit. This after you have lifted the cam ofcourse to relax the springs (see pics). I wouldn't experiment with an advance taking place in higher RPMs than Honda has prescribed. So far I have not read one post in the international forum saying that that has lead to an improvement, not one, not on a CB500/550. Realise that springs on a TEC and a Hitachi advancer differ in length.
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