Critique my tune

On my roughly 30 hour 372 xp, I noticed the engine screaming more and less willing to four stroke. Also, the idle would surge and a pull on the trigger would cause bogging if I didn’t nurse it up with a few taps.

I gave the L screw an eighth turn CCW which smoothed out the idle and improved throttle response. Hooked up the tach and got the idle to 2700. Gave the H screw the same eighth turn CCW and it maxes out at 12800 and blubbers a little when I lift it out of a cut. Does this sound like a good safe tune or should I screw in the H to get closer to the rated max rpm of 13600?

 

It doesn’t hurt to be a tad rich on H. How does it feel pinned in the cut.

 

What I'd recommend, make a bunch of longer cuts and get that saw nice and hot, then make sure you have a good 4-stroke burble when you rev it unloaded. I personally don't rely on a tach. I do have one just to see what the saw is turning but I don't tune w/ it.

 

So if you can’t get the burble at WOT without a load, is it too rich or too lean?

 

Typically lean.

 

It feels more like it did right out of the box. Revs up quick and settles in to a nice happy zone where it’s cutting with torque rather than horsepower. Before the adjustment, it had more of a peaky, sport bike character. When the chain was less than perfectly sharp, I was catching myself cutting at part throttle to avoid overrevving.

 

Numbers seem good. Replace the fuel filter and clean the air filter… then check again after it’s been hot like said above.

 

If you can't get 4stroke, it's lean.


Here's a vid (not mine) w/ decent sound quality.

 

That was an excellent use of 4 minutes. I’ve read a bunch of tuning guides but nothing explains it this consicely. Love me some YouTube!

 

That’s a good video and sound. Me thinks I gots a little tuning to do