1981-1984 Official Honda ATC250R Shop Manual, Page 184Get this manual
TROUBLESHOOTING
ATe 250R
SYMPTOM PROBABLE CAUSE
POOR PERFORMANCE AT HIGH SPEEDS
CHECK 1Check ignition timing PROPER INCORRECT-il (1) Faulty CDI unit (2) Faulty pulse generator
2Disconnect fuel tube at carburetor FUEL FLOWS OUT FREELY
FUEL FLOW RESTRICTED -
( 1) Lack of (2) Clogged (3) Clogged hole (4) Clogged
fuel in tank fuel line fuel tank cap breather fuel valve
3Remove carburetor and check for clogged jet
CLOGGED(Damaged fuel strainer