2007 Yamaha Apex Factory Service Manual, Page 71Get this manual

2007 Yamaha Apex Factory Service Manual, Page 71

CARBURETOR TUNING INSP ADJ A Standard main jet Main jet whose diameter is 10 smaller than standard Main jet whose diameter
from the carburetors, the change in pressure in the intake will create lean mixture that may cause severe engine damageThe
air silencer box has no effect on performance characteristics and must be secured to the carburetors during carburetor tuning
and adjustmentAlso, it must always be in place when the engine is operatedRegularly clean the silencer and keep it free from