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Everything Dirt Bike
General Dirt Bike
What did you do to your bike today?
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<blockquote data-quote="2Wheels" data-source="post: 211777" data-attributes="member: 3804"><p>Pulled the piston from the '14 yz250f today.</p><p>Cyl looks good piston is a JE 977, no crank slop. Chem dipped and cleaned up pretty good. I was concerned about the zero clearance on the intake valves so I thought I'd hunt down where it went. Gotta figure it had .15mm at some point and I didn't want to just shim and go with it. Pulled the valves and cleaned up sorry no before pics, but here's an after.</p><p></p><p><img src="http://i29.photobucket.com/albums/c253/wFo250/FF06DE26-C2B5-4834-9AD5-371AB18137A0.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>have you seen a valve with a dish like this? At first glance I thought it was pounded and there went the .15mm but the closer I looked I didn't see any mushrooming, and the valve margin thickness is right in spec. It just looks very perfect am machined to be a bludgeon effect. Here's another</p><p></p><p><img src="http://i29.photobucket.com/albums/c253/wFo250/A5F1B61F-BC82-4EA5-B1BB-1C130467366D.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Anybody seen this on a "good" valve?</p></blockquote><p></p>
[QUOTE="2Wheels, post: 211777, member: 3804"] Pulled the piston from the '14 yz250f today. Cyl looks good piston is a JE 977, no crank slop. Chem dipped and cleaned up pretty good. I was concerned about the zero clearance on the intake valves so I thought I'd hunt down where it went. Gotta figure it had .15mm at some point and I didn't want to just shim and go with it. Pulled the valves and cleaned up sorry no before pics, but here's an after. [IMG]http://i29.photobucket.com/albums/c253/wFo250/FF06DE26-C2B5-4834-9AD5-371AB18137A0.jpg[/IMG] have you seen a valve with a dish like this? At first glance I thought it was pounded and there went the .15mm but the closer I looked I didn't see any mushrooming, and the valve margin thickness is right in spec. It just looks very perfect am machined to be a bludgeon effect. Here's another [IMG]http://i29.photobucket.com/albums/c253/wFo250/A5F1B61F-BC82-4EA5-B1BB-1C130467366D.jpg[/IMG] Anybody seen this on a "good" valve? [/QUOTE]
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