Just tried my Axial 32 today and I was initially impressed but after 1 gallon I found that it was not all that more powerfull than the mac 28 I had also the pullstart broke and the engine seems to choke up in the middle a bit. and after looking at videos with the RB engine and the OS 28 zx I am going to sell the Axial and do some better looking around I think I might go with your advise and coose the Picco 21 but will still look around. I tried it with a 15t clutchbell and the speed was good but not that impressive over the mac 28 with the 13t. All in all I think the axial is just the same as any stock engine you get with a car nothing special. So this is a last question about engines I think everyone has agreed the Picco is one of the very top 21's for power what about the 28's are the RB engines up their in that engine class or should I go with OS or the Ninja MR28. Oh that Axial drinks juice like I have never seen before 5mins 30 seconds and the tanks nearly empty.