V4 Carb Sync Guide

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Re: V4 Carb Sync Guide

Post by Johannes » Thu Jun 14, 2018 11:33 am

Just reviewing this very informative thread and having not done this before a question came to mind (given that i'm taking my carbs off my 24 this weekend to clean, new pilot jets and new intake rubbers), which is "what is the synch screw doing?" I am assuming that it is adjusting the mechanical linkage to the butterflies??? Am I correct?

I'll go hunting for a similar thread for the NC24, but assume that the process is very similar.


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Re: V4 Carb Sync Guide

Post by Neosophist » Fri Jun 15, 2018 5:10 am

Yes, it just changes the freeplay between the linkages. The NC24 has 4 separate vaccum ports, one of them is not shared with the vaccum tap as the NC30 is so you can leave the tank connected or if you remove the tank and use a dummy tank make sure that you block the vaccum hose.

There are only 3 adjustment screws and one fixed carburettor... adjust all the screws to ensure that all 4 carbs are pulling the same vaccum just off idle.

give the bike time to settle after adjustment and blip the throttle occasionally.

Try to sort it quickly, if the temp gets really high it can throw off the adjustment so best to wait for the bike to cool back down to normal running temp before continuning.
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