The only downside I've seen is the subpar fuel mileage. I don't think my EC300 has broken 30mpg.
I'm not sure why the newer (since the power valve?) bikes aren't that great when it comes to fuel ecomony. My 1974 Kawi F9 350 got around 40 mpg and my 1975 Kawi H1 500 with chambers and stock carbs was good for 50 mpg. I'm not complaining too much - my '00 KTM 380 would out run either.
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'15 YAMAHA WR250F, '75 YAMAHA TY80 Gone: '00 380 EXC, '03 EC300, '07 YZ250, '07 250 XC-W, '08 YZ450F, '12 CRF250R
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