Engine Professional Magazine
P. 1

rebuilding today’s powersports cylinder heads
ideal assembly room
Clean is as clean does
Variable Valve timing
Cam gears rebuild
cooling systems
Not to be forgotten
AN AERA INTERNATIONAL QUARTERLY PUBLICATION
april-june 2018
2018 HONdA CRF250R 249cc engine features an all-new, dual-overhead-cam design, using a finger rocker arm with diamond-like coating. Titanium intake and exhaust valves are larger and have higher lift and narrower angle, while the valve springs’ coils now have an oval cross-section to keep engine height as low as possible. Photo courtesy Honda.


































































































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