Wadd,
Should ya, I spose that would depend a lot on how much it was run since it was done last done.
If it was me I'd just do it so I knew they were right, plus it's not hard to do.
Pardon me, but it seems your looking for a reason not to do it based on the fact that it runs good or I think you would have done it already.
I think the bottom line is they don't have to be off by much and the motor will still sound good, so I just check and adjust so I know valve opening is as it should be.
Dan
