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Top speed of a 125/150 2 stroke

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Just wondering how fast people have been going on a 125 or 150 2 stroke... How do the speeds compare to a 250 4 stroke?

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My 144 would do about 95, my buddy's 250f wouldn't do much more, maybe 100. Top speed means nothing anyways

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My 144 would do about 95, my buddy's 250f wouldn't do much more, maybe 100. Top speed means nothing anyways

That's KM/h right?  not mph  --  that's 60-65 mph and that's right in line with what most 125/150/250F's should be going

 

Leaf is right in that top speed is not a measure of these bike's capabilities -- top speed is limited by the final drive ratio.  A KAwi Ninja 250 with less power than any of these bikes can likely hit 100 mph on the street

Edited by DMC707

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That's KM/h right? not mph -- that's 60-65 mph and that's right in line with what most 125/150/250F's should be going

What?! An 85 can do 65-70

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That's KM/h right? not mph -- that's 60-65 mph and that's right in line with what most 125/150/250F's should be going

What?! An 85 can do 65-70

I just gps'ed a 50 hp 450x dual sport at 78 with stock gearing -it might've had a couple more mph to give, but I wasn't going to risk valve float to find out      -- same bike with Baja gearing can hit close to 100, but i'm assuming we're talking about stock gear ratios on these things

 

It wouldn't really surprise me that a 6 speed 85 could hit 55-60 mph at the extreme top end, but i'd rather get results from someone strapping a GPS to one than just speculation

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125 2 strokes tops speed is around 65 - 70mph.   

 

250f's top speed is around  72 - 75mph.

 

 

 

I had a buddy with a 1994 rm125 all stock besides a pipe, we gps'd him at 71mph. The 250F's on the other hand i have no personal experience to back up..  They have a slightly longer final gear then the 125's and more CC's

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If you're wondering the "top speed" of bikes like these I assume you're taking them on highway?

If you want to know the performance of motocross bikes, ask how they handle, how the torque/ horsepower is at different RPM ranges, how the suspension feels etc etc.

I could throw a 40 tooth sprocket on the wheel and gain more "top speed" in a pinch

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My 98 YZ250 topped out at 55mph. I threw my phone with a GPS app in my backpack and went all out on a straight. My bike is geared way down though for tight trails. I'm not concerned about top speed on my bike though.

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If you're wondering the "top speed" of bikes like these I assume you're taking them on highway?

If you want to know the performance of motocross bikes, ask how they handle, how the torque/ horsepower is at different RPM ranges, how the suspension feels etc etc.

I could throw a 40 tooth sprocket on the wheel and gain more "top speed" in a pinch

Everyone already knows they aren't made for top speed, but alot of people are still curious to know what it is just for a fun fact.  Yes he obviously means highway there is really no where else you can safely test the top speed of any Motorcycle. 

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Everyone already knows they aren't made for top speed, but alot of people are still curious to know what it is just for a fun fact. Yes he obviously means highway there is really no where else you can safely test the top speed of any Motorcycle.

But I tested mine on a dirt trail. About 5 bikes wide and roughly one mile long smooth straight. Perfect for topping the bike out.

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