Hi Stef -
Try a search on "Cylinder Head Protection". (I haven't figured out how to link to a thread, because inside any thread, my broswer's URL window just shows the main forum address).
You'll find lots of experience with the different solutions available.
IMHO, the various approaches to covering only the cylinder heads work fairly well (or not) for parking lot tip-overs, but for anything at speed, not so much. Many reports of their breaking even at slow speed and need replacement.
The engine guards (crash bars) [other search terms!] will offer much more protection for tip overs and work at faster get-offs as well. There is some controversy whether or not the bars may damage the engine case, since they will transfer impact to their anchor points.
I opted for the bars (Hepco and Becker) but if I did it over again, I'd go for the SW Motech bars shown in the thread above.
http://tinyurl.com/2ahfase
I think they offer more protection by having a bar fore and aft, probably spreading out impact forces to more points. My bars, and I believe the SW Motech bars, allow noninterference when removing the valve cover for servicing.
I had my parked bike hit by a cager hard enough to slide the bike down the pavement a couple of feet. Afterward, back home, I sanded the scratches out of the bar, masked it with a slot cut in some cardboard, and spray painted it with a shake-and-rattle can of paint. Easy. (The mirror and side case: not so easy).
Between he bars and the pinned-on side cases, I have experienced protection for my trapped leg when hit from behind while stopped at a traffic light.
I also like the bars as places to hang things like driving lights and foot pegs for extended slab days.
Some people prefer the valve covers for the cleaner look of their naked ride. Being as how as I have a Parabellum Scout fairing, a butt-beautiful Day Long saddle, and hand guards, I'm into functionality rather than sleekness, and the bars fit in well with my other farkle clutter. I'll leave sleek to those Italian guys on the forum!
- Bill