Spacer on the limiter would have same effect...as bending it out...

Which ryobi you running? Single or Twin ring ...that makes a HUGE difference...

Much more compression with the twin rings... easy to see, just pull the muffler off and look in the exhaust port at the cylinder.

I get awesome performance from mine just with high flow muffler from www.wackerengines.com.
Lower the back pressure and toss the stock muffler...

Here's a short video of my Ryobi pulling 18 lb Big Pink around...with smoke..on my web site..

Bambula 18x8 prop...
http://www.crazyherb.com/BigPink/bigpink.htm


CrazyHerb