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I know the hawk 250 has a bigger engine, and is also a bigger bike,
But I think, if I can get my Vader 150 to do 70mph on the freeway, drafting behind another vehicle, I guess it's safe to assume a hawk should be able to do 80mph doing the same.
I would not reduce front sprocket to 16t, but keep the 17t.
Like they say, after about your third oil change (300-500 miles), the bike will open up some.
On the other hand, I would recommend getting rid of the airbox, because the snorkel is a big air restriction, and implodes on itself after a while, further restricting airflow.
Ideally you'd run a pod filter inside the airbox, and just drill out the airbox. That way the pod filter is spared from most mud, rain, or heavier dirt particles.
Also install a less restrictive exhaust, preferably without cat converter.
That way the idle can be lowered.
And most important of all, buy another carburetor, like a PZ30, where you can easily adjust the main jet, to fit the bike.
Those 3 mods, usually net you enough extra power to not only go from a 15 to a 17t front sprocket, but also lower the rear by 5-10 tooth from stock as well, and still make enough power to do 70-75 mph.
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