Do it while the engine is warm and aim for the middle of the specs. .008 in .010 ex This is speaking from experience. Like working at two Honda dealerships over 3 years experience.

 

umop, i didnt want to suggest that cause last time i wasn't liked for the suggestion,
Its funny tho, if you goto a junkyard to some old untouched rockers and try to fit that spec in it probally wont fit, dont trust those 3 dollar gauges. try going to the boneyard and feeling into with your gauge what those are at, it may help you understand what I mean.

 

I've done this before too, but realized it before I put it all back together.

That's exactly his problem.

 

Is this a good thing to do if you have over 100k on your motor?

 

Definately. Your valve lash should be done every 40K mi.

 

The reason the clearances get tighter over time is because the valve and valve seat wear. The valve seats can actually get compressed into the head a tiny amount as well. What that does is cause the valve to sit higher in the head (the spring is holding it up) but the rocker arms are still in the same place from the last adjustment (or when it was built).

I always shoot for the tight side of whatever valve clearance specs you're given to try to keep things quiet. ...and if you think adjusting these valves are a pain in the ass, try adjusting the valves on a Yamaha R1. 5 valves per cylinder (total of 20 valves) and they're shim under bucket. No locknuts and adjusting screws. Gotta pull the cams and change the shims to adjust. Ugh.

 

loosen, you will beat your adjusters flatter way befor hurting the valves and seats.

 

Ok, ill adjust mine. Thanks