james h
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| posted on 15/8/09 at 05:24 PM |
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Balancing R1 carbs
Drove my car to get emissions tested today. It was the first time I have driven it - yay! But my gearshift sort of broke so I had to drive home in 1st
 in the rain Still fun though 
So my question is, having leaned out the mixture, i.e. screwed the idle mixture screws in more, how can I now balance the carbs? Is there a DIY
version? I seem to remember somebody saying that the vacuum takeoff or something isn't on the carbs...
Thanks
James
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omega0684
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| posted on 15/8/09 at 05:49 PM |
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for r1 carbs you need to get a carb balancer that you place over the end of the trumpet, which the sebsequently measures vacuum or air flow etc?
they are available on ebay cheaply enough
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Dingz
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| posted on 16/8/09 at 12:11 AM |
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This may help as a starting point.
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.
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Coose
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| posted on 18/8/09 at 11:13 AM |
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Click me!
I've posted the cheapest way to do it a zillion times......
Spin 'er off Well...
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james h
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| posted on 18/8/09 at 11:16 AM |
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quote:
Originally posted by Coose
Click me!
I've posted the cheapest way to do it a zillion times......
Yeah sorry about that, I only saw your posts after I made mine I probably spelt something wrong when using the search...
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