While the title may suggest that this thread is about my ex-wife, I thought it might be useful to share some of the inexpensive and easy to do modifications which we have discovered.
Most of these will be done on KLR#2, thanks to planalp's mention of not positioning the slot in the clutch adjustment srew upward. Thanks very much for the mention as it got my mind working on simple mods to am making a list for KLR#2. I owe you lunch for gently getting me off my butt.
Here are a few of the ones I have either originated or learned about. Unfortunately, I have not documented the source so if have stolen one of your ideas, apologies offered.
1) Replace stop-tail bulb with #2357 which makes for a brighter brake light.
2) Silicone RTV used to glue a steel horsehoe shaped plate into the LH case inside shift lever travel. The suggestion was to reduce the chance of having the shifter head driven through the case in a fall/impact. Will look for a photo if someone wishes.
3) Replaced clutch cable by a Yamaha ATV cable. This required modification of the attached cable mounting or adjustment (it's been almost 10 years since did that one). The cable is much stronger and never did need replacing. Show me where to add "I'm an idiot!" to my signature as don't seem to have recorded the number.
4) Install switch to turn off high beam to save power when doing long slow trail riding. Since I ride with high beam on most of the time, experience has been that my high beam burns out first so low beam should be more reliable as back-up. I wanted to be able to instinctively switch the headlight on when meeting another machine on a trail so believe that hitting dimmer to low will be more instinctive.
5) Gut automatic garage door remote and solder push button to controller. Guts into sealed container and button out of sight in dash area. Nice to be able to roll up and open door rather than dig out keys.
6) Notch seat bolt hole and install spacer tubes onto bolts to allow seat to be removed and installed without doing bolts.
7) RTV siliconed alumimum plate to left side of radiator to increase resistance to side crushing. KLR#2 has HT guards so many not do.
8) Made pedal saver cables from salvaged bicycle cables.
Lots more but likely others have better ones...