21-06-2004, 00:39 AM
http://eindiancompanies.com/images/resonator.htm
Y.E.I.S is a very efficient invention. A small bottle ,often called \"boostbottle\", is installed between the carb and the intake port connected with a branch pipe to get the engine to respond quickly from bottom end without flat spots.
It saves 10-15% in gas consumption and makes the engine wake up at lower rpm.
Like many of Yamahas inventions. When it first came out there were many doubters. Just as they doubted the wisdom of a separate oil pump and the 7th port. Or Torque Induction. But if done properly this does work.
The following diagram shows a typical Y.E.I.S setup. The most common mistake people make is not placing the boost bottle above the cylinder, not getting the size right and using a common bottle for two cylinders and failing to make sure that the bottle drains back without collecting fuel.
![[Pilt: Yeis.jpg]](http://eindiancompanies.com/images/Yeis.jpg)
Y.E.I.S is a very efficient invention. A small bottle ,often called \"boostbottle\", is installed between the carb and the intake port connected with a branch pipe to get the engine to respond quickly from bottom end without flat spots.
It saves 10-15% in gas consumption and makes the engine wake up at lower rpm.
Like many of Yamahas inventions. When it first came out there were many doubters. Just as they doubted the wisdom of a separate oil pump and the 7th port. Or Torque Induction. But if done properly this does work.
The following diagram shows a typical Y.E.I.S setup. The most common mistake people make is not placing the boost bottle above the cylinder, not getting the size right and using a common bottle for two cylinders and failing to make sure that the bottle drains back without collecting fuel.