Standard Tuning Recommendations; Adjustments For Altitude & Temperature - Honda CRF150R 2020 Owner's Manual & Competition Handbook

Standard Tuning Recommendations

For the following recommendations to be accurate,
you must use the standard settings as a baseline.
Also, don't change any of the settings until you've
determined what changes are necessary.
Adjustment Standard settings
Pilot screw opening 2 1/8 turns out
Slow jet #38
Jet needle NMQT
Needle clip position 3rd groove
Main jet #140
Float level 0.28 in (7.0 mm)
Identification number FCR08D
Adjustments for Altitude &
Temperature
All jetting recommendations are based on standard
jetting with an unmodified engine. The following
conditions can affect the fuel mixture.
Carburetor Adjustments & Tuning Tips
117
Adjustments for Competition