KTM 250 EXC RACING - Manual (Page 47)

ENGLISH
46
Draining the float chamber of the carburetor
Following every wet cleaning procedure, the float chamber of the
carburetor should be drained in order to remove any water that may have
penetrated into it. Water in the float chamber causes malfunctioning.
Perform this task on a cold engine.
Close the fuel tap and put one end of the hose
1 into a collecting vessel.
Open the drain plug 2 (turning it counterclockwise) by serval turns, and
drain the fuel from the float chamber. Then, retighten the drain plug and
open the fuel tap.
ƽ WARNING ƽ
– F UEL IS EASILY FLAMMABLE AND TOXIC . W HEN HANDLING FUEL , BE SURE TO EXERCISE
THE UTMOST CAUTION . N EVER PERFORM ANY WORK ON THE FUEL SYSTEM NEAR
OPEN FLAMES OR BURNING CIGARETTES .
– A LWAYS ALLOW THE ENGINE TO COOL OFF FIRST . I MMEDIATELY CLEAN UP ANY FUEL
WHICH MAY HAVE BEEN SPILLED . M ATERIALS SATURATED WITH FUEL ARE ALSO EASILY
FLAMMABLE . I N CASE YOU INGESTED FUEL OR FUEL SPLASHED INTO YOUR EYES ,
CONSULT A DOCTOR IMMEDIATELY .
– D ISPOSE OF THE FUEL PROPERLY .
Oil circuit
Via the long oil screen 4 , the oil pump 3 draws engine oil from the oil
sump of the transmission. This engine oil flows through an oil line 5 into
the cylinder head for camshaft lubrication 6 ; the oil quantity is controlled
by the jet screw 7 . An oil duct branches off to the long oil filter 8 where
the coarser particles contained in the engine oil are filtered away. Then, the
engine oil arrives at the short oil filter
9 which also filters the fine particles.
Now, the purified engine oil is pumped past the bypass valve bk to the
conrod bearing bl and sprayed from below onto the piston through a
nozzle bm .
The second oil pump bn draws the engine oil via the short oil screen bo out
of the crankcase, thereby lubricating the transmission gears bp .
Checking the engine oil level
The engine oil level can be checked with the engine either warm or cold.
Place the motorcycle in an upright position and on a horizontal surface (not
on the side stand).
If the engine is cold, the engine oil must be visible at the lower edge of the
inspection glass
A .
If the engine is warm, the engine oil must be visible up to the upper edge of
the inspection glass
B .
Replenish the engine oil, if necessary.
! CAUTION !
I NSUFFICIENT AMOUNTS OF OR LOW - GRADE ENGINE OIL LEAD TO PREMATURE WEAR IN
THE ENGINE .
A
B
3
4
bm
bn
bo
bp
5
6
7
8
9
bk
bl
2
1