Hello Morris, I appreciate your work and presentations. May be you can make videos to show the differences in power and behavior of the engines before and after modification? This is what most people want to know and let them decide to buy your upgrades! (including me) :)
I think it might be a typo error !!!!!!!!!!!!!!!!!! Morris says its a 22/8 in the narrative(53s), pic shows the prop with 22/8 written on it . I think a 22/18 might be a bit too much for any 50cc ? even with 7 cylinders :)
20x8 pro only reached 5400 rpm is going nowhere and for that price I go for dle 55 cc is ten times cheaper or for the saito fg90 r3 still a lot cheaper.