Waco , If you handle engines as carefully as you READ postings and TWIST other's words you may have helped make my point !
I said MOSTLY as opposed to your misquoted ANYONE!
Thank you .


Propwash Don,
You may have a point , the 91 would be a good bet too . The flyer at our field started out with an Enya 120R GP on his Ultimate and had a lot of engine trouble so he went to the 120 FZ ,It flew real well . A 140FZ came along and he couldn't resist. After a few flights he decided the 140 was WAY too much and the 120 is now back up front . I'll bet the 91 would be plenty for most

The Saito 120 has almost the same power as the YS 91 and doesn't cost MUCH more. It is the most durable of the Saito engines that share the same case size . It is a pretty good runner but cannot match the mid range strength or transiton of the YS91FZ.
I LOVE Saitos If I had never owned Saitos I wouldn't realize just how good YS engines really are

You are on the right track looking at 4 strokes. The cost of feeding a fuel slurper like a Webra 120 or a Moki monster hardly makes up for the $20 or $40 you will spend for a good 4 stroke 1