You mention 450 lbs. You need to look at the GVWR rating of any bike you are considering. Sure some of the GVWR rating is lawyer talk covering the manufacturers butt, but some of that rating is design data, such as frame strength, tire load ratings, braking capability and horsepower to weight ratios for the motor. Even the mighty Gold Wing is only designed to carry a few over 400 lb loads, but it is made to do it on a regular interval and long distances. The Yamaha V-star 650 GVWR claims it can handle 382 lbs but will it sustain that load at 70 MPH freeway speeds and stop it all in a safe distance or accelerate onto a busy on ramp safely? Or tolerate a 40 mph crosswind at speed? I wouldn't test the limit on a regular basis. Not with a 450 lb load and any one who thinks different is an accident waiting to happen. There are 500cc and 650cc bikes that put out more horsepower and have stronger braking but not these little V-Twins. They are better suited for solo and limited two up riding. They are not two-up touring bikes. I realize many may take exception to my thoughts on this but the man did mention 450 lb loads so let's be realistic here. My opinions are based on around 1/2 million miles of cruising on various bikes and 9 years as a Motorcycle Safety Foundation Instructor/Rider Coach. But they are just that:my opinions.
If you are only going two-up very occasionally, not too far, and are avoiding busy high speed traffic areas when two-up, then perhaps a 650 is for you. If you alone weigh over 250 lbs I think you would be safer and enjoy 800cc bikes more. If riding any significant mileage then be aware that normally the bigger the motor the less rpm is required to maintain highway speeds. Less rpm normally means less buzzing/vibration transmitted through the bars and pegs equating to a less tiring ride. Your average heavy touring cruiser is only churning about 2850 rpm at 70 mph. Some even less. The Yamaha 650 is spinning about 4250 rpm at 60 mph. The 70 mph buzz would be very tiring.
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