Yamaha RS90K, Owner'S Manual

Page: 60 / 102

8-8
Main jet replacement
Replace the main jet according to the setting chart which
is available at a Yamaha dealer.
WARNING
@
● Never remove the drain plug or the float chamber
while the engine is hot. Fuel will flow out from the
float chamber which could ignite and cause
injury.
● Place a rag under the carburetor before removing
the drain plug or float chamber to catch any
spilled fuel.
● Handle fuel with care: it is HIGHLY FLAMMABLE.
@
CD-04E
1. Loosen the carburetor clamps and remove all hoses
and cables, and then remove the carburetor.
2. Pinch the fuel hose to prevent fuel flowing.
3. Remove the float chamber and install the proper
main jet.
4. Assemble by reversing the removal steps.
WARNING
@
Make sure that all hoses and clamps are properly
installed.
@
Standard main jet:
# 148
Main jet 1 Mixture Condition
Small No. Lean
Warm weather
High altitude
Large No. Rich
Cold weather
Low altitude
U8ES10.book Page 8 Monday, April 12, 2004 1:25 PM