Hya bro, Yep everyones advice is correct, you need a four cylinder multi sync set up, but no-ones explained WHy to you! Put in a very simplified way here goes.......Because there are minor differences between each cylinder, ( no set of four pistons is ever going to wear the bores EXACTLY the same as each other) valve sealing abilities ( same again, not even two of the eight valves will wear exactly the same as each other) and even differences between the carbs, carb sealing rubbers abilities to seal the same as each other ( one may be brand new with new retaining clips for example,and the rest may be old and tired) etc etc......So what this will mean is this, If you had the bike on tickover, and gradually turned the tickover down, and down, You will not get to a situation where all four cylinders will stop firing at once ( because of the differences allready mentioned) One will die before an other and so on,before the bike stops completely............
So, during carb synching, when you raise ( for the sake of arguament) carb One, and the overall tickover increases, that may just be enough extra vacume to say "kick in" number three carb to life, that wasnt previousely doing much, That will raise the OVERALL tickover speed and therefore create more overall vacume. and vise-versa, turning down carb one MAY just ( by lowering the tickover and therefore the available vacume) stop cylinder three from firing properly because carb three aint getting quite enough vacume as it was . EVEN In a "perfect scenario" of a brand new engine,so on an "older girl" this effect can be even more pronounced ( and usually is)
It is a wise and cost effective move to get a good set of vacume ( I bet you all really wish i could spell vacume right by now eh?) gauges, because its not just carb tuning thats at stake......
A well balanced set of carbs will also quieten your primary chains down, (considerabley) and also quiten down your clutch! So, as things are not "snatching" around as much in your bottem end, you are in fact saving lots of wear from happening,therefore saving money in the long run..........
I am also on a very, very restricted budget, Two months ago, the doctor told me I will never work again, (Full time) so money for me and my family is incredibly tight and looks like it allways will be, I never tell anyone to do something i would not do myself, and I have saved up for a set of vacume gauges, they are well worth it, yes it hurts like hell to hand over all that money in one go, I understand this well, but go for it, look after the gauges, and they should last you a lifetime.
Also, once you have got them, and familiarised yourself with their use, and are feeling confident that you can balance carbs succesfully and well, then you could do your mates for them, and maybe earn a few dollars/pounds back to offset the costs of the gauges in the first place maybe?
good luck.
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