I have found this to be not true. I have found my Yamaha VStar 1300 Liquid cooled touring bike brutally just as hot and in most cases more hot to the rider and passenger then my Harley Road King air cooled and the Harley has a much larger engine.On a hot day in heavy stop/go traffic the rider is going to have heat stroke way before his air cooled motorcycle.
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If anything the liquid cooled engine is going to give the rider heat stroke before the air cooled motorcycle. Stuck in traffic the liquid cooled radiator fan turns on and blasts you with 200+ degree heat. It is brutal, let me restate that, it is REALLY brutal when that fan clicks on.
When stuck in traffic with the air cooled engine there is no radiator fan blasting you with 200+ degree heat, the heat just floats away, whatever way the wind is blowing.
I just wanted to clarify, many owners of liquid cooled bikes are not aware of this, its a wash, no bike with a large engine is cooler with or without liquid cooling. I much rather be in traffic on my larger engine Harley Road king then with my past Yamaha liquid cooled. If its a short period of time.
Here is the catch, after a period of time at a standstill, the huge benefit of liquid cooling is you will not have to start worrying if the engine will overheat, if its air cooled you do have that worry but this post is in regard to engine heat to the rider, the other subject is a whole other thread but curable for those rare occasions.
On either type of bike, I rather (and have MANY times) ride through monster storms, sometimes for hours without stopping, then be stuck in gridlocked traffic on either type of bike. )
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