framer1 Posted March 8, 2005 Report Posted March 8, 2005 Been turning wrenches all my life.. not on bikes though.. got my first 2 stroke in '02 (my '03 shee).. Ive been all thru the motor and dont remember seeing a "power valve" but my buddy keeps asking me if I replaced it, or something... Ive seen some other discussions regarding them.. what are they? at first I thought he was talking about the reeds but no... he says 2 strokes have em and they have something to do with the powerband.. anyone wanna clear this up? a little 2 stroke theory maybe? where is it located and what does it do and do ALL 2 strokes have one? Quote
broke Posted March 8, 2005 Report Posted March 8, 2005 For starters, your Banshee does not have them. They are actually a valve that either rotates open or slides up in turn rasing and lowering the roof of your exhaust port. The Motor the Banshee's motor is based off of had them. It was the RZ350, which was a street bike built in the 80's and early 90's. Same size motor, but it had powervalves. They do indeed smooth out the powerband, by making the engine run like it's got a lower exhaust roof down low, then sliding up so the engine runs lkike it's got a high roof when running at high RPMs. Your Banshee can be converted to have them, but that's a whole other story all together. They are much more common in dirt bikes and some older quad had them from the factory. Quote
holeshotkid Posted March 8, 2005 Report Posted March 8, 2005 Good job broke. That was a well thought out and written reply. Quote
broke Posted March 8, 2005 Report Posted March 8, 2005 I guess I have just been playing with the RZ power plants for longer than I had thought. Quote
STLBILL Posted March 8, 2005 Report Posted March 8, 2005 (edited) Hi guys: I found this photo of one: http://www.off-road.com/dirtbike/tech/tope...mattachment.jpg -Bill Edited March 8, 2005 by STLBILL Quote
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