There are a few ways to get them out. I haven't yet had the pleasure of replacing my bushings yet, although I do want to in the near future. You have to kind of treat them like a blind hole bearing. The easiest trick I know of is to use a tap to cut threads into the inner metal sleeve and them a long bolt of that thread type with the end rounded off to be smooth and just using the bolt like a puller to remove the bushings. Here is a demonstration of that process.
Another trick that may work is one I and many others have used to remove pilot bearings from crankshafts. It involves filling the hole with grease and then using a rod or dowel that just barely fits into the hole and striking it with a hammer to drive the grease down to try and hydralic the bearing out. This will only work if there is a little bit of open space behind the bearing though.
Another option is to carefully cut them out using a dremel tool and/or a chisel, but this runs a risk of damaging the aluminum of the hub. This would be more of a last resort IMHO
The Hawk wheel hubs are somewhat based on the CG125 hubs, so likely those bushings will work. That part number is 41241-222-000.
However, before you go off and order those I would suggest trying to pull at least one bushing out to measure the outer diameter and height of said bushings so I can make sure I give you the right part number. There are a few variations on this style of bushing with the 9.2mm inner diameter, ranging in height from 19mm to over 40. And some are 24mm diameter while others are 25mm.
If you can manage to get one bushing free and measure it, that would guarantee the fitment.
Otherwise you can get a new hub, which basically means ordering a whole wheel assembly to the tune of $135, with up to a 2 month wait (I just went through this with a front wheel)
The other option with this would be to order a TT250 rear wheel hub and lace it to your rim. It's $75 for the hub, or you get get the whole rear wheel assembly with bearings and all for $134. The TT250 differs from the Hawk in one area, and that is how the sprocket mounts. The TT250 sprocket actually bolts to the hub instead of using the Snap ring and studs like our bikes and the old CG125's. You also likely wont have to wait upwards of 2 months to get it, and never have to worry about this again.
The rear wheel will work btw. The TT250 uses the same axle, bearings, axle adjusters and swing arm as the Hawk(first hand experience). Worst case scenario i that you may need the left side axle spacer... which is $6 lol. Likely the spacer is the same, but just something to keep in mind if you go that route.
Hub:
http://www.cscmotorcycles.com/TT250-...p/zt26-115.htm
Entire wheel assembly:
http://www.cscmotorcycles.com/TT250-...p/zt26-100.htm
The bushings would be the cheapest route obviously,