ORIGINAL: maxtenet
I own about 70 .40-.46 engines and the Jett .46 will kick the crap out of any of them except for the Nelson and Cyclon. YS are NOT in the same league in two strokes (although they are closer than anyone else). Second tier would be the YS, Rossi's, Irvine, OPS, Skyward,Picco, MVVS, Enya and Webra.
max,
i've never even seen a jett but on their site they say the .46 jett-fire will do between 16,500-17,800 rpm depending on type of pipe with an apc 10x6...sounds good but my pair of old cruddy ys .45fr will do almost 17,000 with OPEN exhaust. looks to me like they are in the same or even higher league than the jett performance wise but not price wise. the ys will easily out perform the rest of the engines in your second tier when it comes to spinning the smaller props.
dave