duck
Life time member
Number of posts : 4462
The smallest battery I've run in a K is an ETX15L which has 220 CCA in a K100.
Starts the bike just fine but I would only recommend it for a bike that gets ridden regularly or is kept on a smart trickle charger.
It isn't a ton of current but the K clock is always draining the battery and if left unridden long enough will discharge the battery.
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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT