YICS???

I was just reading about this, I didn't know what it was and now my head hurts :? . So this could be the hard start problem and not being able to find a good idle? I though it was just carbs. Is this going to be a problem when my custom pipes and aircleaner go on? What should I try first to find what the problem is? Sorry for all the questions, I just want this bike reliable so I can try and make smokeout 10 next year.

 

YICS ( Yamaha Induction Control System) which is basically a vacuum balancing system in the intake manifold.

 

YICS is essentially a small passage connecting the intakes together. It will not cause starting or idle problems UNLESS the plugs at the ends of the passage are missing.

Keep looking to the carbs.

 

So when my new aircleaner and pipes go on, my carbs are being rebuilt, rejetted, and sync'd. Will this affect the YICS?

 

YICS is not affected by much of anything other than extreme gunk buildup or, like Carl mentioned, one of the bolts missing.

hard starting is usually enrichment (and/or idle) circuit malfunction, or.... as I found out on my 550, incorrectly set pilot mixtures, over-compensated with the idle screw so the bike would hold idle. I fiddled with the idle screws a bit, and now it fires up on first bump even in freezing weather.

 

I clean-out the YICS Passage on my Bike twice a season. Just to keep it free from the build-up that gets in there.

I use a length of fiberglass rod I cut from a round driveway marker.
I pop-off the Hex Plugs on both sides of that YICS Passage and push Carb Cleaner soaked "Patches" of terrycloth right straight through the passage until it falls-out the other end.

Not until a patch falls-out as clean as it goes in do I render it clean.
Then, I Plug the Right Side and Leave the Left side open and block it off with my thumb.
While the Bike is running, I slide the Red Tube of the Carb Cleaner Can in under my thumb and give it a good spraying while the Bike is running.

You'll feel the Vacuum get heavier as the Carb Cleaner cleans-out the actual YICS Ports up into the Manifold area.

It takes about 10 or 15 soaked Patches to clean-out the Passage.

Sometimes I have to drive the patch through with a Rubber Mallet on the Ram Rod.

If your Bike has been laid-up for a time. I'd recommend you clearing-out the YICS Passage; too.
There is old gas mud and carbon inside there.
Cleaned-out well; the bike has a nice pick-up coming Off-Idle and through the bottom of the Power Band.

 

The YICS passage equalizes the intake manifold to an extent.
It improves the effecince of the motor.
Clog it up and the motor struggles...
Adding a custom exhaust and custon intake add another level of difficulty to he equations not related to the YICS passage.

*EDIT* Please do as Rick suggests and clean this passage out. Bennificial in the long run

 

Is there a manual I can get that holds all these procedures? Thanks for all your help so far guys!

 

You should have a factory service manual. The manual will tell you that the YICS requires no maintenance.

Please understand, unless the plug has fallen out of the end this IS NOT your issue. The YICS is MAYBE 1% of the whole picture. We plug it up to sync the carbs. The earlier models did not have it at all.

You are barking up the wrong tree.

To quote someone we all respect: "It's the carbs, Rick. It's always the carbs"

 

My focus is on the carbs, I was just asking if there was a manual with all the maintenance procedures in it.

 

Do yourself a favor and get a Factory Workshop Manual specific to the Bike you own.

Everything is covered in the Workshop Manual and the book doesn't confuse you with "How it is on other Models"

Most folks I know that are really serious about doing ALL their own work and saving the money providing all their own tools and labor can hand you a Factory Book or the Haynes ... they have them BOTH!

 

Where is this passge at that needs to be cleaned? Pics would be great . Thanks I am new to motorcycles as I just traded around for a 1982 xj650.

 

Yes, although most people resist the urge, it is MUCH more beneficial to have both the factory service manual and the corresponding Haynes or Clymer manuals available.

http://www.xjbikes.com/Forums/viewtopic ... t=180.html



MANUALS:[/]


lm1) Although it's fun to be adventurous, creative, and daring at times, wrenching on the bike is not one of those times......

The ever-popular Haynes or Clymer Workshop line of "enhanced" factory service manuals cover all major service, repair, rebuild, and maintenance procedures (sometimes in excruciating detail, and usually with many more pictures and illustrations than the factory service manual does), and also includes wiring diagrams and other useful specifications.


HCP1094 Clymer Service-Repair-Maintenance Workshop Manual, for all 1981-83 XJ550 models, as well as 1984-92 XJ600 and FJ600 models. Softcover, almost 300 pages, a must-have manual if you own one of these machines. Each:
$ 32.00

HCP1093 Haynes Service-Repair-Maintenance Workshop Manual, for all 1980-84 XJ650 (except Turbo) and XJ750 models, softcover, over 275 action-packed pages, a must-have manual if you own one of these machines. Each:
$ 25.00

HCP1092 Haynes Service-Repair-Maintenance Workshop Manual, for all 1983-94 XJ900 models, hardcover, over 210 pages, even has a nice color-coded wiring schematic, bless you guys at Haynes! Each:
$ 33.00


lm2) Original Factory Service Manuals are also available. These full-size manuals covers all aspects of diagnosis, repair, and assembly for specific model bikes. These brand new, official Yamaha manuals are one of those "must-have" tools if you're going to be wrenching on your own bike. Plenty of photographs, diagrams, flowcharts, wiring charts, torque values, etc.

HCP1128 Factory Service Manual covers all XJ550 Maxim and XJ550 Seca models 1981-83.
$ 54.00


HCP1134 Factory Service Manual covers all XJ650 Maxim and Midnight Maxim models 1980-83.
$ 54.00


HCP1139 Factory Service Manual covers all XJ650 Turbo models 1982-83.
$ 54.00


HCP1138 Factory Service Manual covers all XJ650 Seca (non-Turbo) models 1982.
$ 54.00


HCP1143 Factory Service Manual covers all XJ700 non-X models 1985-86.
$ 54.00


HCP1145 Factory Service Manual covers all XJ700 "X" models 1985-86.
$ 54.00


HCP1151 Factory Service Manual covers all XJ750 Seca models 1981-83.
$ 54.00


HCP1152 Factory Service Manual covers all XJ750 Maxim models 1982.
$ 54.00


HCP1154 Factory Service Manual covers all XJ750 Maxim & Midnight Maxim models 1983.
$ 54.00


HCP1157 Factory Service Manual covers all XJ900 Maxim models 1983.
$ 54.00


HCP1158 Factory Service Manual covers all XJ1100 Maxim models 1982.
$ 54.00


NOTE: The question naturally arises: should you order the Haynes manual or the factory service manual (for models that have both available?). At the risk of sounding like a pushy salesman, I'd honestly have to answer this question with this advice: "Order both".

Although the aftermarket Haynes manuals are adapted from the factory manuals, and thus there are some areas where there is quite a bit of similarity in content between the two manuals, there are enough areas where there are meaningful differences in the photographs, illustrations, and especially in the descriptive and instructive content that most people (meaning "non-professional mechanics") will appreciate having two different "versions" of the same procedure to refer to.



lm3) Original Factory Owner's Manuals are now available. These small booklet-sized manuals covers all of the basic aspects of proper operation, controls, riding tips, basic preventative maintenance and repair, and assembly for specific model bikes. These brand new, official Yamaha manuals are one of those "must-have" tools if you're going to be wrenching on your own bike.


HCP1096 Factory Owner's Manual for XJ550 Maxim 1982. This manual can be successfully used for all 1981-83 XJ550 Maxim models, even though it will say "1982" on the cover.
$ 17.00


HCP1101 Factory Owner's Manual for XJ550 Seca 1983. This manual can be successfully used for all 1981-83 XJ550 Maxim models, even though it will say "1983" on the cover.
$ 17.00


HCP1105 Factory Owner's Manual for XJ650 Maxim 1982. This manual can be successfully used for all 1980-83 XJ650 Maxim models, even though it will say "1982" on the cover.
$ 17.00


HCP1108 Factory Owner's Manual for XJ650 Maxim 1983. This manual can be successfully used for all 1980-83 XJ650 Maxim models, even though it will say "1983" on the cover.
$ 17.00


HCP1104 Factory Owner's Manual for XJ650 Midnight Maxim 1981.
$ 17.00


HCP1112 Factory Owner's Manual for XJ700 N/NC Maxim 1985.
$ 17.00


HCP1116 Factory Owner's Manual for XJ700 S/SC Maxim 1986.
$ 17.00


HCP1122 Factory Owner's Manual for XJ750 Seca 1982. This manual can be successfully used for all 1981-83 XJ750 Seca models, even though it will say "1982" on the cover.
$ 17.00


HCP1121 Factory Owner's Manual for XJ750 Maxim 1982. This manual can be successfully used for all 1982-83 XJ750 Maxim models, even though it will say "1982" on the cover.
$ 17.00


HCP1124 Factory Owner's Manual for XJ750 Midnight Maxim 1983.
$ 17.00


HCP1126 Factory Owner's Manual for XJ900 model 1983.
$ 17.00