Carburetor - Idle - KTM 85 SX 2021 Owner's Manual

15 TUNING THE ENGINE
Column 2 corresponds to a needle in the standard position.
Column 1 corresponds to a needle which is half a clip leaner.
Column 3 specifies the diameter of the first cylindrical part of the needle. The smaller the diameter of the first
cylindrical part of the needle, the richer the mixture. The larger the diameter of the first cylindrical part of the
needle, the leaner the mixture. The first cylindrical part of the needle has the greatest influence in the lowest
load range.
15.4
100
Info
The top right jet needle A2 corresponds to the richest setting of the carburetor, and the bottom left jet
needle E1 corresponds to the leanest. The optimal carburetor tuning is shown under the respective model.
B00075-10

Carburetor - idle

402799-10
Clip position
1 ... 5 Clip position from above
The five possible clip positions are shown here.
The carburetor tuning depends on the defined ambient and operat-
ing conditions.
The idle setting of the carburetor has a big influence on the start-
ing behavior, stable idling, and the response to throttle opening.
This means that an engine with a correctly set idle speed is easier
to start than if the idle speed is set wrongly.
Info
The carburetor and its components are subject to increased
wear caused by engine vibration. Wear can result in mal-
functioning.
The factory setting for the carburetor is set for the following val-
ues.
Height above sea 301 ... 750 m (988 ... 2,461 ft)
level
Ambient tempera- 16 ... 24 °C (61 ... 75 °F)
ture
Super unleaded (98 octane) mixed with 2-stroke engine oil
(1:40) ( p. 123)
The idle speed is adjusted with adjusting screw
The idle mixture is adjusted using the idle air adjusting screw
402797-01
1
.
2
.