KTM 85 SX 2020 User Manual

19 TROUBLESHOOTING
112
Faults Possible cause Action
Engine stalls or is popping into
the carburetor
Lack of fuel – Turn handle of the fuel tap to the
ONposition.
– Refuel. ( p. 29)
Engine takes in bad air – Check intake flange and carburetor for
tightness.
The connector or ignition coil is
loose or oxidized
– Clean the connector and treat it with
contact spray.
Engine overheats Too little coolant in cooling sys-
tem
– Check the cooling system for leaks.
– Check the coolant level. ( p. 93)
Too little air stream – Switch off the engine when standing.
Radiator fins very dirty – Clean the radiator fins.
Foam formation in cooling sys-
tem
– Drain the coolant. ( p. 94)
– Refill with coolant. ( p. 94)
Damaged cylinder head or
cylinder head gasket
– Check the cylinder head and cylinder
head gasket.
Bent radiator hose – Change the radiator hose.
Incorrect ignition point due to
loose stator
– Adjust the ignition.
White smoke emission (steam
in exhaust gas)
Damaged cylinder head or
cylinder head gasket
– Check the cylinder head and cylinder
head gasket.
Gear oil exits at the vent hose Too much gear oil added – Check the gear oil level. ( p. 104)
Water in the gear oil Damaged shaft seal ring or
water pump
– Check the shaft seal ring and water
pump.

KTM 85 SX 2020 Specifications

General

Engine Type	1-cylinder, 2-stroke engine
Displacement	84.9 cm³
Starter	Kickstarter
Transmission	6-speed
Clutch	Wet, multi-disc clutch, Formula hydraulics
Front Brake	Disc brake
Rear Brake	Disc brake
Front Brake Disc Diameter	240 mm
Chain	1/2 x 5/16"
Steering Head Angle	66°
Weight (without fuel)	68 kg
Frame Material	Chrome-molybdenum steel
Bore x Stroke	47 mm x 48.95 mm
Frame Design	Central tube frame, chrome molybdenum steel
Front Suspension	WP XACT USD, 43 mm
Rear Suspension	WP XACT monoshock
Tank Capacity	5.2 liters
Fuel System	Keihin PWK 28
Wheelbase	1, 290 ± 10 mm