I have .21 and .27 Team Infinity engines.... they are fast, lots of torque, durable and break in has been simple. Only complaint is they are sensitive to temperature so you have to constantly adjust the needles just a bit... eventually you end up with the settings for hot, cool and cold weather. Word of advise: Before g¿break in seal the carb housing and backplate with red silicone to avoid air leaks and use the % oil they recommend... mine use 19% oil and I use 20% nitro.... its hard to get a 19% nitro of the shelf so I buy a gallon of 16% nitro and add castor oil in proportion to reach 19%.

Finally they tend to run hot (240-260 even 300 if really lean) so use aluminum clutches.

FYI: You wont find a better engine for the price.