RE: another darn ryobi post (ryobi performance modification, analysis and comparison)
I have a referance test engine working now.
A very clean stock single ring piston,large case long shaft,with a small 8mm carb that was also cleanned up,and a 2 runner port head.It has about 5 for compression.I was working with the EI,so there was no mag. and coil to mess with.I think the timming was about 15 degres BTDC.A Zoar 18x6 for the prop.I was getting abound 7100 rpms at full throtle and was idleing down to 2500rpms.The gas was 91 octane and 40:1 oil mix.I was running open exhast to see how bad it was burnning the fuel.Yea, a little loud !!
About 62 sunny little to no wind and dry( around 30%)
If anyone else is running the XYZ EI ignition that you got from China, check your magnet before you glue it into the hub. It is picky to N or S to trigger it.Hook it all up and pass the magnet up to the hall sensor to get the right side up.