After running my long shaft Ryobi 31 in my Rascal 110 quite a bit in 2009......I decided I was quite happy with the way the ZAMA carb performed. The engine ran smooth as silk all year and produced some respectable power considering the engine is all stock. I earlier thought I might swap out the carb with a Warlbro, but I think I will leave well enough alone on that engine. I have another short shaft Ryobi project I am still working on, and this Ryobi has the Warlbro carb. So be interesting to compare the two. This engine is either going in a large profile plane or a 120 size Super Sportster I am scratch building.