sorry to be full of questions

[snyper316]

All I know this the first time I tried to warm the tube before putting it back on but didn't see a mist just some popping without it being on really didn't think the tube would cause that if it wasn't attached is reason I'm asking about its purpose and the fact I don't see one on Shorty but she is only a twin piston bike.. versus our V-4s

 

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[bongobobny]

Yes, that is EXACTLY what that short tube is, crankcase ventilation! Seems to me I remember @skydoc_17 coming up with a little different vent eliminating it going to the airbox but I could be wrong. That was many years ago...

[skydoc_17]

Hey Greg,

In the early 80's, both auto and motorcycle manufacturers were scrambling to meet the new EPA requirements about combustion gases being vented to the open air. A "quick fix" was to run a scavenger tube from the crankcase to the air box. The theory was that Carb. vacuum would pull the crankcase emissions into the air box, and be recirculated into the Carbs. With the tube off of the air box, you have changed the air flow ratio to the Carbs. (too lean)

By replacing the crankcase vent tube, you have returned the air flow ratio to the stock setting. This is what stopped the popping. The risk with the vent tube connected is if you over fill the engine oil, or your bike has quite a few miles on it, you will vacuum the excess engine oil or "blow by" engine gasses from worn piston rings right into the air box, contaminating the air filter and the Carbs. I do offer a Vent Filter and Air Box Block Off Kit, But have removed it from the VR.ORG Classifieds because of protests from "tree huggers" and "carbon footprint police" that feel that even though the kit does an excellent job of separating the Air Box from combustion gases from the crankcase, it harms the environment. Out of respect for those people, I removed the kit from the Classifieds. I do sell, and install this kit for First Gens. at my shop. If you are interested, please feel free to PM me. Sorry Jane Fonda!

Earl

[snyper316]

Figured it was good Ol government at work the rebel of course is a 2007 which may explain the difference between that 85 I seen a while back the only time oil goes in my air box is when I accidentally over filled the oil thought it went to the top line that's before I found this site...

 

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[yamagrl]

Yes, that is EXACTLY what that short tube is, crankcase ventilation! Seems to me I remember skydoc_17 coming up with a little different vent eliminating it going to the airbox but I could be wrong. That was many years ago...

 

 

It performs the same function as PCV Valve on an auto engine.

 

[snyper316]

Attn all Legends of the site cowpuc yamagrl bongobobny Venturous Randy and whoever else I may have missed. I have heard of the Jake Mod but due to Freebird thread about missing pictures. I found that plugging the YICS ports is probably best to do. My question is how many have done such. Did it make a difference. Seems like it something I wished I had done while I had the carbs off. What about just Plugging the hoses off and pulling the box? Thanks for all and any Input on this.

[Venturous Randy]

This thread gives some detail on what I did to never have to worry about the YICS, ports, plugging caps or anything else ever again. I recommend everyone do this to their YICS as the system is way more trouble than it is worth.

Randy

 

http://www.venturerider.org/forum/showthread.php?86100-Plugging-YICS-ports

[snyper316]

This thread gives some detail on what I did to never have to worry about the YICS, ports, plugging caps or anything else ever again. I recommend everyone do this to their YICS as the system is way more trouble than it is worth.

Randy

 

http://www.venturerider.org/forum/showthread.php?86100-Plugging-YICS-ports

 

That is the thread I was speaking off Randy, I was asking how many has done this, and what they found? I didn't realize it was your thread. I have had the flu last few days and feel like POO!!!!

Edited September 3, 2016 by snyper316

[bongobobny]

Mine still has the YICS on it, but I treated the canister seam to insure it was not leaking with a bead of waterproof sealer, forgot the brand but it was for all surfaces and was waterproof and gas proof. The seam is where it usually develops leaks. I then replaced all the hoses with new ones and clamps. On my new VMaxified engine it is based on a 1300 so no more YICS for me...

 

The YICS system is something that on paper and theory works, but in real life may or may not! Here's some reading for you...

 

http://xjbikes.wikidot.com/yics

 

http://prototype900turbo.blogspot.com/2011/02/yamaha-yics-good-for-fuel-economy.html

 

Now, for other models with YICS like the 650, 1100, etc. you need to use a special tool when sync'ing the carbs, but with the 1200 Venture it is not necessary.

 

Hope Randy's info helps! I'm sure it will be debated until the end of time whether or not you actually DO get the increase in MPG over it not being there...

[snyper316]

Pretty soon I'm sure everyone will find out; it is just plastic, and Mama Yam don't make them no more.

 

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Edited September 3, 2016 by snyper316

[snyper316]

First I gotta get Marie new shoes, then after that probably new boots. So.... That is when I'll remover her appendix, if I decide to .

 

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