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Message: [QUOTE="Jeremy Wilkey, post: 117552, member: 17220"] On the left is a early model Noleen Valve this was taking from a 89 KX. Over the next few years the 20mm and the 25 changed to look similar to the 98 PA valve pictured. The major diffrence being the porting work on the entrances and exits. The PA valve is rough and if you look you will see that the top patern is not even square or concentrick. The onrings crhronically fall off beacuse the grove is not concentrict to the ID. I've spared these guys the indignety of showing the piston exit face as it is the side that really maters. I'm still working on good photo software but I will folllow up. With better pictues. Sorry About the WP refrence, I was working on a WP distributor addvertisment and just took the phots on top of the add..I did not intend them to be drug into this. [/QUOTE]