Normal
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.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 anotherAnybody seen this on a "good" valve?
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.
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
Anybody seen this on a "good" valve?
