The Thunder tiger pro 61 is a great engine , break in is easy enough and idles really smooth . Transitions very well , I own mostly Thunder tiger engines and have found them to be of equal quality if not better for ease of tuning and operation then most others , including OS , price wise you cannot beat the value you get for your money , stock and after market parts are readily available , do a search on here and compare your varoius options I am sure you will find something that makes you happy

Good Luck