Manual Yamaha WR400F (page 746 of 776) (English, German, French)

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TUN

EC720000

CHASSIS

EC71P002

Selection of the secondary reduction ratio

(Sprocket)

Secondary

reduction =

ratio

<Requirement for selection of secondary gear

reduction ratio>

● It is generally said that the secondary gear

ratio should be reduced for a longer straight

portion of a speed course and should be

increased for a course with many corners.

Actually, however, as the speed depends on

the ground condition of the day of the race,

be sure to run through the circuit to set the

machine suitable for the entire course.

● In actuality, it is very difficult to achieve set-

tings suitable for the entire course and some

settings may be sacrificed. Thus, the settings

should be matched to the portion of the

course that has the greatest effect on the

race result. In such a case, run through the

entire course while making notes of lap times

to find the best balance; then, determine the

secondary reduction ratio.

● If a course has a long straight portion where

a machine can run at maximum speed, the

machine is generally set such that it can

develop its maximum revolutions toward the

end of the straight line, with care taken to

avoid the engine over-revving.

NOTE:

Riding technique varies from rider to rider and

the performance of a machine also vary from

machine to machine. Therefore, do not imitate

other rider’s settings from the beginning but

choose your own setting according to the level

of your riding technique.

Standard secondary

reduction ratio

50/14 (3.571)

SETTING

Number of driven sprocket teeth

Number of drive sprocket teeth

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Yamaha WR400F Manual

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