That's basically it. Stock stroke + 52mm bore = 88cc. 52mm bore + 51mm stroke = 108cc. TBparts is pretty good with their product descriptions & support.
As for the support upgrades...
First off, a high-volume oil pump is a good idea with any displacement increase, even a basic bore-up. If you're doing a rebuild...and building a larger-displacement tune is not very different than a rebuild...a new oil pump is cheap insurance. Using a high-volume replacement is about the same money and the only additional work is enlarging the top end metering orifice, a 5-minute job...if you work slowly. Additional oil flow aids cooling.
Next up, now that the motor can make a lot more grunt, the clutch needs to be more robust...to control it. Heavy-duty clutch springs + a new clutch pack (plates & discs) are the minimum. However, HD springs...at least for the manual clutch...have gotten tougher to find. For manual, I'd either use the Takegawa 3-discs clutch, it's a lot of value for the money. For a semi-auto, HD springs are readily available..however...TBparts semi-auto clutch is nice upgrade, all-new parts. They also offer a full manual flavor, too. If you're building a high-revving tune, TBparts also offers a billet clutch basket for either.
Cam selection depends on which head you're running. With a 6v/plain bearing head, there aren't many choices...it's basically stock, "fast road" and race. Since bigger displacement makes any given cam profile "act smaller" I'd go for a more aggressive bumpstick, and opt for "HD" valve springs. (They're not really a lot stiffer, but have wider coil spacing to prevent binding with higher valve lfit.) That way, a cam-swap is easy, if you change your mind later.
Overheating is always a concern, one you have road-going power and sustained cruising, at speed, becomes possible. A dipstick oil thermometer is an inexpensive way of monitoring temps. Once you have enough power to sustain 50mph+, it's likely you'll need an auxiliary oil cooler.
Lastly, since horsepower equals airflow...and vice-versa...you'll need a bigger carb to allow deeper inhalation and a free-flowing exhaust to let those ponies exhale. A Mikuni VM20 carb is a known good choice, along with a rotated intake and open-element air filter. There are a number of exhausts from which to choose.
This might sound like a lot of changes. In a way it is...but...it's not complicated. The only additional parts are an oil cooler kit and dipstick thermometer and it could be argued that the thermometer is just a part substitution. The rest, in reality, little more than using different parts. Most are items that would be replaced as part of a stock rebuild.
