Solid little helmet
I've had a chance to give this about a 200 miles of commuter riding and this is a pretty solid little helmet.
Fit & Comfort:
The fit is pretty spot on. I'm in the upper range of the Medium(23) and between a round and intermediate shape head. The first few rides I had slight pressure at my forehead but once the padding wore in a bit, it was perfect. Putting the helmet on and off is also quite tight along the temples due to the bottom of the cheek pads. I believe the medium was at the top end of the first shell size, so I didn't want to move up to a new shell size. The difference in shell sizes between HJC and the Kabuto are apparent.
Comfort is on par with my last two helmets (HJC IS-16, GMAX gm68s), but seems slightly heavier. The padding also has a similar feel to the HJC. It wicks away sweat very well and keeps me relatively cool even in stop and go traffic at 90*F.
Airflow & Noise:
Airflow seems ok. I can never really tell though. In commuting traffic I keep the visor open a crack and its enough to cool me in hot weather. Once speed gets going there's a good amount of air circulating. There's way more detents for the visor as well than in my HJC.
Noise for me seems to be louder than my HJC. I wear earplugs and I still hear a good amount of wind noise. I'm not sure how water tight the gasket is either, the visor seems to just close and doesn't pull tight when closed like the HJC.
I was able to fit a generic bluetooth communicator with no problems, and even use a clip mount despite the thick rubber trim. The boom does get in the way a bit when putting it on so I have to position it higher up near the breath guard.
The ratcheting chin strap is fine. I have no preferences with either method. There's still a D ring to attach the helmet to a helmet lock.
The inner sun visor is nice, but a little less polished compared to the rest of the helmet. When I first got it, the visor fell out of its slot and I had to secure it, otherwise it kept getting stuck in the shell. The internal visor mechanism on the HJC feels more substantial. Its also much easier to access with gloved hands, but once I got used to the location of the lever on the Kabuto, its not too bad. The tint also seems to be a shade darker than the HJC. The HJC comes down further, but the Kabuto comes down enough.
Overall fit and finish is nicer than my HJC. It just feels like a much more solid helmet.
On Kabuto Kamui Stinger Helmet