Anyone one ever checked the top speed of a piped YFZ450. Nothing else just piped and rejetted stock gearing and tires no other mods.

 

It will have the same top speed as stock.

 

As pendejo said, it will be the same, but it will get there quicker.
The YFZ (in stock trim)(according to Dirt Wheels) did not top out because it lacked power, it topped out because it hit the rev limiter. So reardless of what you do to improve power, it will not increase in top speed. Only gearing changes/different tire sizes, or an aftermarket rev limiter with a higher RPM limit will change the top speed of the YFZ.

 

Ok thanks for the info. Before I put the High comp piston, TM42, and the cam mod in mine I ran it next to a friends crotch rocket and it topped out at 84 which is faster than they say it should run in stock form.

 

678.2334 MPH give or take current wind velocity

 

just a shade over 7.8 mph.........only if its a cobra pipe!!!!j/k ....no clue

 

at least 245

 

I hear those speedos are not too accurate.

 

The speedometer on the crotch rocket?? Yamaha is accurate.. so ive seen

What is TM42?? lol

 

TM42 is a mikuni 42 mil carb