Honda CBR250R Forum : Honda CBR 250 Forums - View Single Post - Why This 250cc Engine Have Long Lifecycle ?
View Single Post
post #15 of Old 11-13-2017, 07:08 PM
Senior Member
Keith's Avatar
Join Date: Mar 2014
Location: Southern England
Posts: 394
Thanks: 16
Thanked 53 Times in 43 Posts
Originally Posted by MotoMike View Post
No doubt the current crop of 450cc four stroke motocross engines are a testament to the kind of power & performance can be achieved from a mid sized single cylinder. However, those engines are not built to withstand sustained operation over time at higher RPM's, which is a primary consideration for a road going bike. They are very "high strung" purpose built motors, where motocross & supercross tracks rarely demand more than 5 to 10 seconds of WOT over the longest straights before a rider is backing off for a tight corner, or when in mid-air over a big jump.
I'd still have thought they could be detuned/refined/developed into 40-50bhp units with the required durability for road use. KTM and Ducati's big twins make well over 100bhp per litre from similar or larger cylinders.
Keith is offline  
For the best viewing experience please update your browser to Google Chrome