YZ250 local sound audition - subtle dynamics revision 3, September 12, 2026

YZ250-turn1.mp3, YZ250-turn2-jump.mp3, YZ250-turn3-jump.mp3
Recordings by madmini, Freesound. Creative Commons Attribution 4.0.
https://freesound.org/people/madmini/sounds/192395/
https://freesound.org/people/madmini/sounds/192398/
https://freesound.org/people/madmini/sounds/192397/
https://creativecommons.org/licenses/by/4.0/
No endorsement by the author or Yamaha is implied.

These are trackside riding recordings, not onboard microphone recordings.
No usable Yamaha idle was present. Idle and the low RPM bridge temporarily use:
Honda CRM 2 stroke dirt bike onboard riding, pull away, ride, stop
Recorded by Fork Media, published by ZapSplat under CC0 1.0 Universal.
https://www.zapsplat.com/music/honda-crm-2-stroke-dirt-bike-onboard-riding-pull-away-ride-stop/
https://creativecommons.org/publicdomain/zero/1.0/

Riding edits: mono conversion, long excerpt selection, acoustic-pitch stabilization,
infrasonic rumble removal, modest slow level correction, loop crossfades and gain.
Idle/low-rev revision: new original-speed Honda CRM excerpts, infrasonic rumble
removal, loop seams and fixed gain. Their irregular firing is not pitch-stabilized.
The approved Yamaha riding samples and the pickup/overrun samples are unchanged.
Playback: RPM resampling, adjacent range crossfades, throttle/clutch load changes,
and sound-only upshift RPM ratios based on Yamaha's YZ250 manual (not YZ250X).
https://www.incolmotos-yamaha.com.co/wp-content/uploads/2020/09/YZ250X-BRY.pdf

This is an adapted interactive audition, not an unmodified real race recording.
The samples do not supply tach telemetry or a full set of separate load states.
Unloaded revs now rise and coast down with an audio-only inertia model. Sustained
clutch-in wide-open throttle adds short, irregular, smoothed attenuation bursts.
This is a designed breakup effect, not a claim about a stock YZ250 ignition limiter.
It does not run during loaded acceleration. No synthesized engine tone or
distortion is added. Game performance and shift-boost timing have not changed.

Revision 3 uses exactly the same recordings as the approved rev/idle revision.
Brief, smoothed envelopes emphasize recorded throttle pickup and clutch engagement.
During breakup, 25% of the low-frequency body that would be attenuated is retained;
it comes from the recording, not a synthesized tone. At steady loaded throttle,
the added processing is a pass-through. No additional sample downloads.
The approved revision remains available locally with &take=approved.