I'm with everyone else here... if the asset is paid for, and all you're doing is improving it's serviceability, then you're gaining, not losing.
It's better to have something, and be not afraid to take it all apart, work on it, make it the way YOU need it, than to just buy something new and be smitten with it as-is, while paying interest on something that could be gone the next time a minivan turns in front of you. Or in the short form, like my Dad says: "If you can't afford to lose it... you can't afford it".
One of the reasons it took me so long to buy a Wing... was because my CX500D is STILL running strong, and the list of improvements on it, won't fit on three pages of single-spaced fine print.
My 1200 Aspy is in line for her share of mods... I've already changed out half the lamps for LED, but not the headlamp YET. It's gonna get LED driving lights up front, because the high beam pattern reaches out, but leaves the lower and near rather dark... and LOW beam doesn't reach out far enough to prevent over-driving my sight distance at anything over 35ish mph.
I DID replace my stereo and speakers... not as fancy as your setup, as the '84 Aspy fairing doesn't take to larger speakers that well. I yanked the factory amp and volume management system (none of it worked anyway)... the new speakers are likely better in performance than the OEMs were when new, but certainly better than the OEMs were when (all the pieces) came out... so it sounds better, but it ain't great, simply because it takes speaker surface to move air... there's no replacement for displacement.
I'm curious about the Kenwood amp's actual output, and how well it's performing under motorcycling conditions.
The airflow around a motorcycle fairing is unlike a stage performance environment, and our expectations of sound quality are substantially different, but generally, the idea of sound is pretty simple- it's air movement. A 5" speaker's surface area is just under 20 square inches. For my stage sound system, we use very simple math to assure that we get good results... it's all about the power-per-square-inch of speaker surface... too little, and the speaker isn't able to displace air efficiently, and too much, the peak air pressure in front of the driver results in loss, not dispersion. I target our systems to run 1 watt RMS per square inch of speaker surface... so an 18" subwoofer will be at 250w, a 15 runs 176. The four inch drivers in my Aspy's fairing, under those circumstances, good for 12w each... and while my AM/FM/MP3 player was 'identified' in it's paperwork as being 20w/channel, my test measurements (load resistor and indicated about 11 watts when I started hearing clipping on the AF monitor). I've had guys bring me auto amps to repair that were painted all pretty and labeled 1000w, driving a subwoofer labeled as 4000w, and I'm certain that in those cases, whoever did the artwork on both, didn't have the slightest clue what a watt actually was.
Kenwood, in my opinion, has always been very truthful in all their 2-way radio (business band, HAM, marine VHF) ratings, and in all the professional and home audio electronics very respectable as well. They held true in the automotive market, but the the auto-sound industry in general has gotten terrible about overstating product capacity, it wouldn't surprise me if that 200w rating was a bit 'adulterated' in order to stay visible in the market, but I'm certain that it is more than sufficient for the speakers you have there. The key question is: How does it sound at highway speed?
Aside from speaker size and ambient airflow, the other aspect of motorcycle environment, is the amount of volume available BEHIND the speaker. My CX500D wears a Pacifico Aero II fairing, which has a surprisingly GOOD mounting space- 5-1/4" car speakers were INTENDED with that fairing, and there's a large volume of space to allow the speaker to breathe... and it's not enclosed in such a way that frontal air pressure 'loads' the back side of the speaker when underway. I know my '84 Aspy doesn't have much airspace to offer speakers... so I've been contemplating how to compensate.