3. Adjustments
USE AND MAINTENANCE MANUAL CHAPTER 3
ADJUSTMENTS2-Strokes - Edition 01 / 2023
92
D
NYDF-3
NYCF-2
NYDF-2
D
C
A
B
NYFF
NYCF
NYEF
1
1
2
3
4
5
Jet needle adjustment (XE 125 version)
On the carburettor used in the XE 125 the main nozzle is
of non-removable type and therefore cannot be replaced.
Therefore, adjusting the carburettor requires changing the
pin.
The pin adjustment parts, which have the same taper angle,
are available in different straight part diameters and different
taper start positions.
“Racing” version pin: NYCF
If the retainer position number is the same, changing NYDF
to NYEF has the same effect as raising the retainer position
by 0.5.
A. Rich
B. Lean
C. Initial position of the taper part
D. 0.5 groove variation
Adjusting the jet needle groove position
Should the engine be hard to run smoothly at intermediate
speeds, the jet needle “1” must be adjusted. If the mixture
is too rich or too lean at intermediate speed operation,
irregular engine operation and poor acceleration will result.
Whether or not the richness of the mixture is proper is hard
to be determined by means of the spark plug and therefore,
it should be judged from your feeling of actual engine
operation.
Too rich at intermediate speeds: rough engine operation is
felt and the engine will not pick up speed smoothly. In this
case, step up the jet needle clip by one groove or 0.5 groove
and move down the needle to lean out the mixture.
Too lean at intermediate speeds: the engine breathes hard
and will not pick up speed quickly. In this case, step down the
jet needle clip by one groove or 0.5 groove and move up the
needle to enrich the mixture.
Standard clip position:
XX 125 version: n.3
XE 125 “Racing” version: n.3
XX 250 version: n.3
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