YICS Tool - Leave it in?

Ive just taken delivery of a brand new YICS Tool. The instructions state that you can leave it in the bike......is this true?

What are the effects of leaving it in, surely it cant to it any good....

 

The rubber seals can melt and make the tool next-to-impossible to remove, as well as clog up the tiny passageways inside the head!

 

Well, ive checked in my bits and pieces at work and apparently, the Viton O Rings can take temps upto 400 degrees Celsius, so in theory, they could be OK. My real issue though is whether leaving the tool in could damage the engine in any way.

 

You want to leave it in all the time? Only defeats the YICS why would you do that?

 

I'd take it out. And throw it straight in the trash.

 

i just bought a yics tool off ebay, very nice piece actually.. i put it in and initially made the carbs a little easier to tune, however i dont have the right vacuum gauge set up, so i pulled it out and ended up hand syncing the carbs and air screws by ear and feel. runs as good or better than it ever has.. props to me and my years of experience tuning carbs for go kart racing.....!

p.s. take it out. fuel/air mixture is more efficient with functioning yics system, adding gas mileage and a bit of power. compliment yamaha's engineering by tuning it the right way.

 

The YICS tool is just that, a tool. It is used to temporarily isolate the carburetors so they can be synced individually. You need the vacuum gauges or the baby bottles and liquid to get 1, 2 & 4 to match up with #3 since #3 is not adjustable. You are not supposed to leave it in, if you do leave it in very long even during the carb sync some of the rubber parts will melt in the port, and good luck getting it out then. The tool is not something someone just dreamed up to eliminate the YICS port; it was designed by the guys who came up with YICS as a way to isolate the carbs for easy and accurate syncing.

 

Exactly. A tool. You use it and then put it away. Or don't use it; and leave it in the drawer. Not in the bike.

 

Thought I would pass on what I use. Instead of throwing my YICS tool in a drawer I put it in a piece of PVC with end caps. Keeps it clean and protects it from damage.

 

I know its a tool, thats why i bought it. I understand the engineering aspect of the yics system and would not want to delete that function. I was simply giving my two cents, and answering a question of a lesser informed member.

 

Thanks for the advice. The instructions that came with the tool do state that it can be left in, thats why I questioned it as it did seem a little odd. Thanks again

 

I was just thinking about making a YICS tool storage container myself... good idea.

 

To address the possible overheating idea, which could roast the tool,
I run a box fan on the motor, and have a meat thermometer behind plug #2; warmed up is 160*, and I shut down when I see 210*
I'm sure the cooking thermometer is running cooler than the head.

 

That is a great idea! on my third and final sync i left mine in for a second to long and one of the center rubber stoppers got just to the sticky point, on inspection of the port with a fiber optic image scope there was no residue inside the port "whew" but I can only imagine what could have happened if the YICS tool would have stayed in a few more seconds.