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Old 12-02-2012, 01:55 PM   #16
Gordo83
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Not to change the subject, but what is the white jug with the black pipe going to ? doing there. I've had an 85 TY350 for several years and haven't seen this add-on. This is in regards to the craigslist TY350
in Kansas City.
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Old 12-03-2012, 06:37 AM   #17
Sting32
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Location: Minneapolis, Ks
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Quote:
Originally Posted by Gordo83 View Post
Not to change the subject, but what is the white jug with the black pipe going to ? doing there. I've had an 85 TY350 for several years and haven't seen this add-on. This is in regards to the craigslist TY350
in Kansas City.
I've seen the mod, on several of these old Yamaha bikes in Wichita area, back in the days. I ended up with a 350 not long ago that had this, but I dont really know what it does... Because, I only rode Bultaco's back in those day, so cant tell you exactly, but I think it was Some theory about response time on throttle using this "can" which I believe stores up "vacuum" so that when you crack the throttle it acted differently. I could be wrong...
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Old 12-03-2012, 08:30 AM   #18
brewtus
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Originally Posted by 2whlrcr View Post
That's a big plus, because half of the people in the US can't. And I'm including the ones that were born here too.


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Old 12-03-2012, 09:26 AM   #19
PSchrauber
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Quote:
Originally Posted by Gordo83 View Post
Not to change the subject, but what is the white jug with the black pipe going to ? doing there. I've had an 85 TY350 for several years and haven't seen this add-on. This is in regards to the craigslist TY350
in Kansas City.

That is a hand made Yamaha YEIS System, that they had back then.

YEIS stands for: Yamaha Energy Induction System

The YEIS consits of a plastic container, which is connected with a rubber hose to the inlet of the engine.
This creates a kind of reservoir between the carburetor and cylinder, in which the two-stroke mixture will retained when the slide (little or no gas) or the gates/reeds of the cylinder are closed until the slide or gates/reeds by the piston are opened again.

The system also works as a vibration damper in terms of sound (Greetings to Hemholz) at certain speeds between the combustion chamber and carburetor as the gases oscillating back and forth.

The YEIS causes a better engine response, more torque at low and medium revs and a lower consumption by up to 10%.
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Old 12-30-2012, 06:54 PM   #20
xtnomad
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If you are still looking, I boxed away quite a few parts years ago, Rings,Pistons Gaskets Reeds ect. I have a stock cylinder and head still on the shelf. PM me.
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Old 01-05-2013, 09:48 AM   #21
RobbieO
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We used to call that thing a "boost bottle". I had one on my Italjet and the improvement of low end response was noticable!!!
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