Right now I can't really decide which motor I like best. I have no major complaints about either of them. My 2 stroke has been running like a champ since new and is still going strong. I have over 2000 miles on it now and have just recently switched oil from Briggs and Stratton 2 stroke oil to an Amsoil synthetic. Top speed on this bike is 35-40 mph with a 32 tooth sprocket.
I've been experimenting with adding different amounts of oil to the Grubee GB on my Honda 4 stroke. I don't care for the way the clutch grabs so I have added Amsoil 4 stroke oil to the GB. I started out with adding 2 oz. oil and clutch was slipping too much so I'm now using 3/4 oz. and this is better but still a bit too much slippage for my liking. I'll try 1/2 oz. oil next and see how that works. My top speed on this bike is 35 mph with a 44 tooth sprocket.