11-01-2017, 03:27 PM
UJM was a term coined back in the 70s to describe how Japanese manufacturers had settled on the air-cooled, inline-4 standard motorcycle as their flagship products. It stands for Universal Japanese Motorcycle. In those days, it was hard to tell the manufacturer of a particular UJM without looking at the nameplate. 
To the subject, I've been riding UJMs almost exclusively for over 35 years now and I've used windshields on just about every one. I can understand purists who believe naked bikes should remain naked, but personally, I like a bit of protection from the wind and elements.
The key is matching the bike and size of the rider to the windshield. For example, I use a smaller shield (NC Deflector DX) in the excessive summer heat. It keeps the wind pressure off my chest, but keeps my helmet in clean air. During the winter or on long haul trips, I use a larger full coverage shield (NC Plexistar) that keeps everything but the very top of my helmet in the calm air behind the screeen.
For every windshield there is a thin, turbulent zone that divides the calm air behind the shield and the wind blast coming over the shield. The key is not to have this turbulent zone hitting the face of your helmet. That only results in noise and buffeting. On both of my shields it took some tweaking of the various adjustments to get the height and angle to work for me. Unfortunately, what works for me will probably not work for someone who is a few inches taller or shorter.
BTW, in no circumstance would I recommend a windshield that you can't see over. Heavy rain or a splash of mud could leave you riding blind. BTDT.
To the subject, I've been riding UJMs almost exclusively for over 35 years now and I've used windshields on just about every one. I can understand purists who believe naked bikes should remain naked, but personally, I like a bit of protection from the wind and elements.
The key is matching the bike and size of the rider to the windshield. For example, I use a smaller shield (NC Deflector DX) in the excessive summer heat. It keeps the wind pressure off my chest, but keeps my helmet in clean air. During the winter or on long haul trips, I use a larger full coverage shield (NC Plexistar) that keeps everything but the very top of my helmet in the calm air behind the screeen.
For every windshield there is a thin, turbulent zone that divides the calm air behind the shield and the wind blast coming over the shield. The key is not to have this turbulent zone hitting the face of your helmet. That only results in noise and buffeting. On both of my shields it took some tweaking of the various adjustments to get the height and angle to work for me. Unfortunately, what works for me will probably not work for someone who is a few inches taller or shorter.
BTW, in no circumstance would I recommend a windshield that you can't see over. Heavy rain or a splash of mud could leave you riding blind. BTDT.