Yamaha went to work on their YZ250F in 2027. The YZ450F receives no significant changes in the new year but the 2027 250F adopts the same 450F frame geometry and also gets a ton of engine revisions as you will see below. Early reports told us that the bore and stroke of the YZ250F would be changed in 2027, but we got confirmation that it has NOT changed. We will get more information as it is given to us. We are supposed to be headed back east to test the 2027 YZ250F in early July so look for a full test right here on Steve’s site. Below is what Yamaha gave us for information as we relay it to you. -KK
An all-new engine has been designed for high-revving performance that delivers a linear engine response with more
power and torque through the rpm range, increasing the rev limit by 700 rpm from the previous model. This was
achieved through the adoption of a rocker arm with finger follower system derived from Yamaha’s SuperSport YZF-
R1, and intake refinements that allow for increased airflow and higher revs. Despite the increase in power, revisions
to the air cleaner box and exhaust systems help make the 2027 YZ250F noise-compliant, meeting FIM/AMA
regulations with a tuned exhaust note that is both more pleasing and comfortable to the rider.
Transferring power to the rear wheel, an all-new hydraulic clutch design replaces the coil springs of the previous
model with a new disc spring and integrates primary gear and basket into a single steel unit. The result is a more
compact, lightweight and durable assembly which yields smoother, more consistent engagement, requiring less
effort while eliminating the need for on-track adjustments.
The 2027 YZ250F adopts the same advanced aluminum bilateral beam frame as the YZ450F, delivering an
unrivaled balance of rigidity and flex characteristics. The new inner and outer structure, including a thinner front
downtube, provide improved stability, better cornering performance and a precise, confidence inspiring front-end
feel. New engine brackets have been designed for optimized rigidity, improving comfort and straight-line stability
with a more manageable character and a predicable response. These combined chassis updates result in greater
usability in everything from slow, tight corners to high-speed sweepers and rough, rutty corner entries and exits,
providing a motorcycle that’s easier to tip in, easier to choose and hold a line, with a higher level of overall handling
performance.
A new high performance KYB® rear shock and revised fork setting tuned specifically for the YZ250F complement
the new frame. The suspension combo provides enhanced damping force with less bump reaction and pitching
movement. The updated shock also has a new hand-operated low-speed compression clicker for simplified
trackside adjustments.
The rear braking system has gone through a significant overhaul, resulting in a lightweight compact design that
delivers improved control with a linear buildup of stopping power. The rear brake caliper piston, the master cylinder
piston and the rear brake disc were all reduced in size, with additional revisions to the brake line material and disc
rotor bolts to reduce un-sprung weight. Even with reduced size and weight, the braking system retains progressive
and strong stopping characteristics. In addition, the rear brake pedal tip also now uses bolt-type fasteners instead
of rivets for simplified maintenance.
As part of the YZ250F’s evolution, styling cues are matched with the flagship YZ450F and now include a slimmer,
more compact front number plate, new two-piece side covers, sharper rear fender and new YZ graphics. The
honeycomb-pattern seat cover material also enhances rider movement on the motorcycle in various track conditions.
Finally, the industry-leading Yamaha Power Tuner app retains full functionality of the previous version and adds an
ECU lock function for theft deterrence, allowing owners to prevent unauthorized engine start-up via a password-
required lock accessed through the app.
2027 YZ250F Features & Benefits
• More powerful 250cc four-stroke engine with a revised, more linear power delivery for added control and
rideability across the entire powerband
• A revised and tuned intake and exhaust meets the latest FIM/AMA noise compliant regulations
• New hydraulic clutch offers lighter lever feel, smoother feathering and a consistent mesh point
• Advanced fuel injection via a 44mm Mikuni® throttle body ensures optimum fuel atomization and power for a
wide range of riding conditions
• Five-speed transmission with tri-shaft layout vertically stacks transmission shafts for a lighter, more compact
configuration
• Yamaha’s industry-leading Power Tuner App includes intuitive “Quick Setting” slide bar giving the rider direct
access to engine tuning, revised Traction & Launch Control settings, and an ECU-lock function
• New frame design balances rigidity and flex characteristics for a calmer front-end feel and enhanced stability
• Compact body includes seamless, rounded features that ease rider movement for enhanced control
• High-spec fully adjustable Speed Sensitive System KYB® coil spring-type fork provides exceptional feel and
bump absorption
• New high performance KYB® rear shock enhances low-speed damping and smooths the damping transition
between low and high speeds for enhanced control in a variety of conditions
• New compact and lightweight rear braking system improves controllability with a linear buildup of stopping
power• Updated styling includes a slimmer, more compact front number plate, new two-piece side covers, sharper rear
fender and new YZ graphics
• Honeycomb-pattern seat cover material maintains ease in rider sliding forward while improving hold from sliding
rearward during acceleration
• Compact, lightweight push-button electric start provides effortless engine starts
