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[ame="http://www.youtube.com/watch?v=_REQ1PUM0rY&feature=related"]YouTube - Valve Float[/ame]
inside a 4 stroke
[ame="http://www.youtube.com/watch?v=sEf8va1S7Sw&feature=related"]YouTube - In Cylinder Video ( How a 4 stroke engine works )[/ame]
no valve springs
[ame="http://www.youtube.com/watch?v=GXIdOTkJhEY&feature=related"]YouTube - Springless Valvetrain For Push Rod Engines![/ame]
inside a 4 stroke
[ame="http://www.youtube.com/watch?v=sEf8va1S7Sw&feature=related"]YouTube - In Cylinder Video ( How a 4 stroke engine works )[/ame]
no valve springs
[ame="http://www.youtube.com/watch?v=GXIdOTkJhEY&feature=related"]YouTube - Springless Valvetrain For Push Rod Engines![/ame]