The "stock" chain sprockets for our bikes are 15 tooth front / 43 tooth rear. You can add or subtract teeth from either end. I find it easier to swap out the front counter shaft sprocket. I have 14, 15, and 16 teeth sprockets [or is that "tooth"?]. My day to day, run up and down the asphalt and gravel road sprocket is the 16 tooth. It drops my RPM's by about 300 at 70 MPH. I also run a taller rear tire, thinking that this reduces my RPM's, too. There is such a thing as getting them geared too high, so that you have to down shift to get up a slight incline. I haven't used a 14 tooth on the KLR in a few years. Any place that needs that low of gearing, I ain't taking that fat pig anyways. The bike is too tall and top heavy to be single tracking for me. That's why God made dirt bikes. You don't see many draft horses running in the Kentucky Derby for similar reasoning.
Here is a reasonably priced, good wearing sprocket by Primary:
BTW, the "Primary Drive" chain and sprockets from Rocky Mountain are long lasting and inexpensive.
Hit the drop down box for tooth count options. 15 teeth are about the best all around gearing. 16 teeth makes first gear a bit tall for any off road or technical riding. I do some creek crossings, and frequently have to "hunt and peck" my way across the stream to dodge rocks. 16 teeth is too much for this. I do it, I just don't like it. Falling in the creek when its 30 degrees out and the water is half a degree above freezing harshes the joy of ridin'. 'Specially when you have 12 more miles to get to the house.
Seats. I suffer from "hot spots". Pressure points that become lava hot and unbearbly painful. The HD Panhead post-mounted saddles of the 1960's were about the last comfortable stock seat I enjoyed. Looking back now, at the time, I would have enjoyed a cast iron hay mower seat, if it meant getting wind in my face and my right hand around a throttle.
I find if I can spread the load out onto my thighs, I can add hours and miles to my day without developing a hatred for my motorcycle. Wider contact area, without cutting off circulation against a sharp seat contour. Riding motorcycle doesn't have to be brutal. We can put people into space stations for months at a time, and I never hear of them complaining. We should be able to create a pleasurable seat for our rides. Most custom seats are "form over function"......kinda like putting a set of rims on the Electra 225. Looks better, but don't help the ride none. The three or four biggest names in replacement seats are in business to customize, not comfort-ize. A seat that makes the ride more bearable and holds together as long as the bike does is a winner in my book.