Tag Archives: What is the top speed of a 180cc kit YZF-R125

YZF R125 180cc kit top speed

TL;DR: Top speed I’ve managed (so far) on mine with 180cc kit, 160cc injector and longer duration cam, with PCV + Autotune/wideband: 89mph.


So I’ve noticed there’s people searching on this topic so I’ll share what I’ve discovered so far, hopefully it’s of some use.

Top speed on mine when I got it, as 125cc on stock 14t sprocket was 83mph (indicated). That was absolutely throwing-it-down-a-hill-with-the-wind-behind-you, the most I could get out of it. 83 seems to be a fairly common top speed for stock bikes. Some other people have claimed 86 out of a stock bike but I can’t verify that myself and that wasn’t my experience.

Continue reading YZF R125 180cc kit top speed