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81 Yamaha XJ 750 Seca discussion forum:RE: YICS |
| RE: YICS |
| Jeremy said 2005-09-09 23:29 |
| http://www.umgweb.com/member1/plus111.htm#buyxj http://www.i-op.com/jimm/xjfaq.txt* * What is YICS? Yamaha Induction Control System. Most XJs (and many other model Yamahas) use it. Essentially, YICS means that there are passages or tubes connected the intake of all cylinders together. In the inline four XJs, it´s a passage (also called a ´gallery´) in the block located just below the intake passages connecting all four intakes together via small air passages. It is reputed to make a difference -- some owners of other types of motorcycles make their own ´YICS´ by connecting the intakes with tubing. Also, when unblocked (after synchronizing) the idle will usually increase slightly. YICS would be nothing but a rather esoteric feature if it weren´t for the impact it has on carburetor synchronization. Yamaha (and most listizens) recommend "blocking off" the YICS passages when synchronizing carburetors and adjusting idle mixtures. The tool for blocking the YICS passage can be bought from Yamaha for big bucks. Or you can make your own for a couple bucks (instructions at: http://home.westman.wave.ca/~jbe/YICS.htm or search Google for YICS tool). Mike Oberle is now selling his YICS/R ´reproduction tool´, which closely resembles the Yamaha version, but at a considerably more reasonable $30 price. See: http://plan9.dnsalias.org:88/xj/products/YICS-R.html |
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