Eliminating the YICS?

Hi everyone. I'm Rob and quite new here. I searched the forums and archives but as of yet haven't found an answer to this burning question.

Can you do away with the YICS? (I did see topic about converting to YICS)

I have a chance to pickup an '82 maxim with the YICS VERY cheap*. I want to strip this puppy down and build a bobber, but I don't want to have a system that is going to be a pain if special tools are needed. It kinda defeats the whole idea of what I'm wanting to do. Hence, can the YICS be eliminated?

*How cheap? $125 and the bike more or less runs. The bike will idle all day. Give it gas it dies. The guy had the carbs apart and he doesn't know about the YICS so I imagine that is the problem.

 

YICS is nothing more than a series of interconnected passages in the head that direct a stream of intake air into the port just upstream of the intake valve. There are no moving parts; the only "special equipment" required is a YICS block-off tool when you sync the carbs. Some varieties of YICS block-off tool supposedly CAN be permanantly installed; but I'm not going to advocate it.

You can't "convert to YICS" any more than you can really effectively do away with it; other than to block the passages. It's designed (and cast) in.

 

Good to know.

 

Don't clean the YICS ports & you have done away with it.

 

You don't need to buy a YICS tool. I use Rick's "stuffomatic" method with a little variation. I take a cotton t-shirt and cut a inch and a half ring off the bottom. Cut this to make a long length of cotton. Soak it in Marvel Mystery Oil and pack it into the opening, cutting off the excess length. This effectively isolates the YICS ports from each other inside the passage. Install the two bolts and sync away. When synced, just pullout the cotton plug.

 

Cool, thanks.
Are those carbs proprietary? I do know the carbs need a complete rebuild including new diaphragms and those kits aren't cheap.

 

New diaphragms are over $100 a pop. How many are bad? IMHO, they really are the one part in the carb (not including the body...if you break off a float pin) that is not worth replacing with new parts. The best suggestion I can give if you want to save money is ebay a set. It might be $100, but you might get all 4 diaphragms in good condition, and other spare carb parts.

For all the seals, o-rings, and other various parts you will need to rebuild them properly, send chacal a PM.

 

Hard to tune one of these XJ-Bikes and have it perform just right once you upset the Intake Air restrictions and Exhaust Pipes.

You can have a naked mean-looking Bobber, but it's always going to be cranky and not wanting to run right.

That's the way it is.

 

Thanks for all the info. I'll just get another motor for it.

Thanks RickCo. I was about to ask about tuning once I trashed the airbox and built the 1into1 drag pipes but you already answered.

 

why not just get a crappy v twin to mutilate?

 

Mutilate? I don't want a crappy V-Twin. I don't want a great V-twin. I don't want any V-twin.

Do you have something constructive to add, or do you just get off on making BS comments?

 

instead of getting rid of the yics why not just forget about it
if you don't bother it, it won't bother you

 

true, i have a non YICS motor (82 650 Seca). I have to tune like anyone else, No Tool. I'm with Polock, keep it and enjoy

 

It's a moot point now. I got an XS motor from a friend. He too turned his XJ YICS into a bobber and promptly trashed the YICS and went with an XS motor instead.

I've since been told that jetting carbs on an XJ can be a nightmare and since the airbox is going away as is the stock exhaust jetting should be done.

Thanks to those who gave me info. Won't need to come back here anymore since I'm going XS.

 

Hmmm...XS motors just drop in? I think the opposition you found here is because the YICS wouldn't cause the problems you initially described. Sounds more like a fuel delivery problem, or possibly electrical. A lot more information would be required.

But you probably have more foresight than most to just try working on a simpler engine if you really want to change in the intake system. Other options include using non-CV carbs, creating a single or double pod PVC intake system (there are some threads on this...they look cool, but only time will tell how functional they really are), or go make your own EFI (also been done).

Post the engine up on the Sell, Trade, Swap, Wanted. What model is it? I'm sure someone on here could use it and pay you something for it.

 

ok bye