Yamaha Power Valve System (Y.p.v.s.) - Yamaha SXV70G Owner's Manual

Standard main jet:
# 156.3
CD-04E
Main jet 1
Small No.
Large No.
1. Loosen the carburetor clamps and remove the carbu-
retor.
2. Pinch the fuel hose to prevent fuel flowing.
3. Remove the drain plug and install the proper main jet.
4. Assemble by reversing the removal steps.
WARNING
@
Make sure that the throttle outer cable is firmly
seated in the holder and throttle operates smoothly
after assembling the carburetor.
@
ESU00156

Yamaha Power Valve System (Y.P.V.S.)

The Y.P .V.S. is a vital part of the engine and requires very
sophisticated adjustment.
Adjustment should be left to a Yamaha dealer who has
the professional knowledge, specialized data and equip-
ment to do so properly.
1 Y.P .V.S.
CAUTION :
@
The Y.P.V.S. has been extensively tested and set at
the Yamaha factory. Changing these settings without
sufficient technical knowledge may result in poor
performance of or damage to the engine.
@
8-9
Mixture
Lean
Rich
Condition
Warm weather
High altitude
Cold weather
Low altitude