Author Topic: Carb tuning and deactivating YICS  (Read 2464 times)

hoverhead47

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Carb tuning and deactivating YICS
« on: March 07, 2015, 07:23:25 AM »
I've just read a treatise claiming that to tune and balance Yamahas 1982 and newer, the YICS needs to be deactivated.  This article IS referring to the inline engines but I am wondering if the same may apply to the Vtwin.
Here is item http://home.westman.wave.ca/~jbe/YICS.htm
Any opinions (considered preferably)?
 

Prophet Of Doom

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Re: Carb tuning and deactivating YICS
« Reply #1 on: March 07, 2015, 07:55:26 AM »
The YICS on the XZ is very different - there is no linking between the cylinders so there's no need to disable the YICS to balance.

turbosteve84

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Re: Carb tuning and deactivating YICS
« Reply #2 on: March 07, 2015, 09:39:37 AM »
Absolutely correct. Not only that, the inline fours have a special YICS tool -- kind of like a long, metal stick --  you use to close off the system. Try finding a mechanic who still has one of those. MacGyver types make their own.
Steve
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