Alright this is a 2 stroke Echo trimmer.

21cc; single ring piston.

Light scratches no deep scores in cylinder.

The cylinder has it's cross-hatching still.

I rebuilt the carb & replaced the crank seals.

Compression is 125 psi.

I read elsewhere that these trimmers typically have 120-130 psi.

I did replace the ring but compression did not seem to improve.

The new ring only got to 100 psi. The old was 125.

This may have been the seal on my compression tester - I could not tell.

My tester screws in too far before seating so I used some teflon tape on the threads and didn't screw in too far to avoid hitting the piston.

Difference between old and new ring is negligible thickness-wise.

Old ring has chamfering on upper and lower edges

Put old ring back in when new ring did not improve compression.

Set coil to .012" air gap. (Would larger gap (.014-.016) change anything?)

Here's the trouble:

Got it running; idles well.

Will accelerate and hit wot (8k-10k wherever I set it)

but has about [B]a one second bog[/B] on the way up.

If I squeeze the trigger slowly it comes up okay but if I goose the throttle it bogs just a little as it takes off. Enriching the hi only works to a point. Never quite enough to make the small bog go away.

I've tried enriching the low jet to the point the idle is poor,

but it does not help.

Does this sound like symptom of the metering rod setting being off a little?

Or something else?

I can use the trimmer; - just real annoying to have the small bog considering the time I spent on it.

-Appreciate your thoughts.

-br