Valve Check Question

[ChrisK]

What's the best way to remove the clip holding the rocker arm in place? I tried using a 90 degree pick that I have but no luck so far.

[Speeddog]

I use an exhaust spring hook tool.

[brad black]

I use a 90 degree pick.

[ChrisK]

Took the opening shim and belts off. Pushed on the closing arm and still couldn't fit the .0015" gauge in.

[Speeddog]

Took the opening shim and belts off. Pushed on the closing arm and still couldn't fit the .0015" gauge in.

If you push down on the closer rocker arm, can you turn the shim?

Is it turning the valve as well?

Cam turns freely between the points that it starts opening the valves?

[ChrisK]

Yes I can turn the shim, to be honest I can't be certain the valve stem wasn't turning. I don't think it was, but I can check that later. Yes, the cam was able to spin freely.

[ChrisK]

Yes, the shim spins, the valve stem stays still.

[Speeddog]

That closer sounds OK.

Has the engine been run recently?

[ChrisK]

Yeah, about a month ago, ran great until I had that problem with the starter clutch remember?

Also, after I got the new starter clutch and Keihins installed I started it and ran it in the garage for about 5 minutes, ran great.

[Speeddog]

OK, that's good.

I'm just concerned that there's some debris on the valve seat corrupting the reading.

Very unusual to have both clearances so small on the same valve.

[memper]

I remember when doing my valves for the first time I would get different readings on the same shim. Be sure the cam is in the correct spot in rotation. Can't remember which either at the highest point or the lowest point (when the rocker touches the shim).

[ChrisK]

I'm pretty sure that's not the case Memper. I measured the vertical cylinder first and everything checked out, then I spun the wheel again around to TDC. I can now feel the piston in the horizontal cylinder, can't in the vertical cylinder. Unless there's something else I don't know about.

[ducpainter]

If the belts are off it doesn't matter where the crank/piston is when checking clearance as long as you bring the piston up to TDC before removing the closer shim.

The valve will drop into the cylinder if you don't.

Just line up the pulley mark on the cam.

[ChrisK]

Yep, done that too.

[Armor]

When the valve seat wears, the opening clearance gets smaller and the closer gets larger.  They both have to change.  They are connected to the same valve.  Now if the shims where change previously by someone ??