560xp "flat spot"

[SawTroll]

anyone else? had mine a month or two now but only realistically started working it hard this week,8 tanks a day in large ash coppice.starts,runs and cuts like a dream,just has a very slightly annoying flat spot when revved from idle,keep it spinning its fine but just that fraction of a second is bugging me! guess it'll wear in? thanks

 

Take a look here.

[SawTroll]

It sort of does. Dunno if it's been mentioned earlier, but I think the 560, and I know the 550, have idle bypass screws. In practice, on a ported saw, they sort of work a bit like the "L" screw when you adjust them. Snelling has used them to good effect to adjust out flat spots from idle in 550's.

 

I have read about that about the Walbro carb of the 550, but not about the Zama on the 560/562, I believe?

 

My memory may of course be off....