No. The engine can handle a larger prop. Accoding to the specs it will handle up to a 20" prop. I don't want to have it maxed out. I am thinking a Zinger 18 X 8. I have an APC 17 X 8. That will probably work but like the looks of the Wooden props. I am running 25%. I tried to locate cubman but can only find his profile and the email. I tried to email him but it comes back "not deliverable". I am not to good at surfing this site. There is nothing easy about it unless you live on it and I don't have the time to surf for hours. Why can't these people make it easy for the lay person. Maybe it's just me. !!!!!

Ron