I had real bad bogging such that I couldn't get past 40 mph. my issue ended up being I did the valve adjustment on the wrong stroke. If you didn't adjust the valves I would do it.
The valves are at the top of engine and come very tight from the factory.
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Hawk 250 with following performance mods: 17t, Mikuni with 110/25, Uni filter, Exhaust.
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