Yamaha WR250F(N), Руководство по эксплуатации для владельца

Страница: 646 / 686

7 - 7
T U N
Jet needle adjustment
The jet needle is adjusted by changing it.
* For EUROPE
** For CDN, ZA, AUS and NZ
The tapered sections of all jet needles have
the same starting positions, but the needles
are available with different straight-portion
diameters.
Standard jet needle
OBELP
*OBEGP
**OBEHP
<Example>
OBELP - 4
Clip position
Diameter
a
of straight portion
Leak jet adjustment (accelerator pump
adjustment)
The leak jet
1 is a setting part that adjusts the
flow of fuel discharged by the accelerator
pump. Since the accelerator pump operates
only when throttle is open, the leak jet is used
to adjust a fuel mixture ratio for quick throttle
opening and is therefore different from other
setting parts that adjust a fuel mixture for each
throttle opening (each engine speed).
1. The engine breathes hard in quick throt-
tle opening.
Select a leak jet having lower calibrating
No. than standard to enrich the mixture.
<Example> #105
→
#95
2. Rough engine operation is felt in quick
throttle opening.
Select a leak jet having higher calibrating
No. than standard to lean out the mixture.
<Example> #105
→
#115
* For EUROPE
** For CDN, ZA, AUS and NZ
Standard leak jet
#60
*
,
** #105
1
SETTING