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The 2019 YZ450FX is an excellent open-terrain race bike and a very good tight-woods bike for an experienced rider. The power comes on abruptly. I added a "Throttle Tamer" which helped a lot in tight single track.
I am an experienced rider, and the suspension is the best (in stock form) that I have ever had for high speed trails. No need for a revalve unless you want a very supple feel over rocks and roots. I weigh 160 lbs, and it is feels adequate for my weight or someone slightly heavier. The steering is light but very stable. I immediately felt comfortable riding aggressively the first time on the bike.
Motor vibration is minimal at low rpm and almost unnoticeable at high rpms.
Intake noise is an odd sound, even more so when wearing ear plugs.
Mpg is in the mid 30's riding aggressively and 40 mpg riding easy with standard mapping. With fueling adjusted leaner, the bike can get between 50 and 55 mpg with 14:49 gearing. Adjust fueling to -4 with phone app.
Starting is a bit finicky when warm. Bike needs to be in neutral with a slight increase in idle speed.
Oem battery was weak and started getting weaker with just 4 hours. Added an Anti-gravity ATZ-7 Restart. Maintains proper voltage now.