1. Home
  2. Honda R&D Technical Review Vol.24 N...
  3. Development of NSF250R Commercial R...

Technical Review e-Book: Summary

Development of NSF250R Commercial Road Racer with 4-stroke Engine

Article of Honda R&D Technical Review Vol.24 No.2


A Moto3 category that uses 4-stroke 250 cm3 engines has been established for Grand Prix motorcycle racing from 2012. Due to this new category, Honda has developed the NSF250R, which is equipped with a newly developed 4-stroke single-cylinder 249 cm3 engine. The new engine features an intake-from-front, exhaust-to-rear layout to increase charging efficiency, and a 15° rearward tilted cylinder to concentrate mass. A thinner lightweight piston and nut-less connecting rod are used to reduce weight, an offset cylinder and a closed crankcase with scavenging pump are used to reduce friction, and a midship muffler is used to concentrate mass. These and other measures realize engine performance and maneuverability suitable for a commercial racing machine in the Moto3 category, which is the gateway to road racing.


(1) Suwa, S., Kawaguchi, D., Murakami, A., Kimura, K., Tada, M.: Development of Nitrocarburized High Strength Crankshaft Through Controlling Vanadium Carbonitride Precipitation by Normalizing, SAE Paper, 2009-32-0076 / SETC2009, 20097076 (2009)
(2) Marui, Y., Kinoshita, T., Takahashi, K.: Development of a Titanium Material by Utilizing Off-Grade Titanium Sponge, SAE Paper, 2002-32-1816 / SETC2002, 20024309 (2002)

Author (organization or company)

Tomio ONOSATO(Motorcycle R&D Center)、Yoshiyuki KURAYOSHI(Motorcycle R&D Center)

We would like to get your opinion on this research paper. (This is only applicable to registered members.)

The readers of this research paper have also selected these research papers.

Development of RC213V-S
Article of Honda R&D Technical Review Vol.28 No.1
Presentation of RC211V Equipped with 4-Stroke Engine
Article of Honda R&D Technical Review Vol.15 No.2
Development of NC700 Series
Article of Honda R&D Technical Review Vol.24 No.2