New Brozz 250 stutters above 3000 rpm

[Megadan]

Valve specs for almost all of the OHV CG engines are .05mm - .10mm for metric, .002in-.004in standard. Anything within those min and max ranges is perfectly fine. It is a good idea during break in to run a wider lash spec.

IF you run on the wider end of the spectrum, .08-.10mm/.003-.004in the valve clatter will Be a little louder, but you are also guaranteed to have no run issues, and you will be able to go a couple to a few thousand miles before your valve lash will need checked.

If you want to keep the noise down a little, then the best spec to run on these engines is .06mm/.0025in. It gives the best balance of noise and service intervals. I personally don't recommend running the minimum spec of .05mm/.002in unless you are obsessive about valve lash checks every 1k miles.