mcg
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| posted on 11/8/11 at 10:09 PM |
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Carb tuning link
Hi - I am tuning my fireblade carbs (on 8v Vauxhal engine) at the mo, and remember there being a great link to someones build website that takes you
thorugh step by step the process of balaning and the tuning carbs.
Dont suppose anyone has saved the link for it have they??? Could really do with reading it again.
Thanks in advance.
Matt
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Dingz
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| posted on 11/8/11 at 10:29 PM |
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Don't know of the link but this is what I do, it may help?
Assuming the timing is already correctly set start off by setting the idle screws all the same 2 ½ -3 turns out, then balance the carbs when it is
running either with a flow meter or listening to the sound of the suck with a bit of rubber hose. One of the carbs is the master, probably the one
with the cable connected so get the next carb in the line sucking the same amount by adjusting the throttle linkage screws, then the next and so on.
You will have to adjust the idle speed as you do this as the revs will be going up and down. This will give you a good starting point, if there is a
lot of spitting back through the carbs at idle and slight throttle opening or overrun then the idle mixture needs richening. If the exhaust is sooty
after normal driving then perhaps the needles could be lowered to lean the mixture if it is sooty after a real thrashing then the mains are probably
too big. Conversely if the exhaust is very pale and it struggles under load then the needles need raising and possibly bigger mains, but without a
rolling road session it will be just trial and error, do runs then check plug colours to get an idea of what is going on.
Phoned the local ramblers club today, but the bloke who answered just
went on and on.
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