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Old 10-14-2012, 05:57 PM   #47566
Sub Zero
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Joined: Apr 2010
Location: Orlando, Florida
Oddometer: 815
question about valves

sorry for posting this question twice but i want this to be at the top of the new page so everyone can see it easier.

Valves came in. get to lap them tomorrow. though i noticed the new ones i ordered (listing was for an XR600R but they share the same part number as an XR650L) have a diff shape to them. they are the same size, diameter etc but my concern is the recessed dome at the bottom.

the stock valves have a wider dome at the bottom. these new ones are mostly flat with a small dome in the center. will this be a problem? will I lose compression? gain it? actually my main concern is will this modify the squish bands negatively and cause the motor to be less efficient.

Valves although look like diff sizes in picture, are identical in diameter / circumference. both are intake valves with the one on the right being the stock intake valve.
1994 WR250-Z | 1997 KX500 | 1998 KLX300 | 2004 CRF450R (Motard) | 2009 KX450F | 2001 XR650R | 1992 WR200R | 1992 WR500-Z | 1986 GPZ900 | 2005 RMZ450 | 1986 CR500AF in a 1998 CR250R frame | all street legal
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