IAME X30 125cc RL - TaG, Инструкция по сборке и руководство пользователя

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- 30 - MAN-043E ENG
The following example should clarify the procedure for the optimization of the sprocket
ratio. Assume to use the engine with Z=10 teeth engine sprocket and that during the
preliminary track tests a Z= 77 teeth axle sprocket has been used.

From Table 1 with Z=10 as engine sprocket and Z= 77 on the axle sprocket, a ratio of
7.70 is found.

Make a few laps on the track and record the maximum engine rpm achieved.
Let us assume that you detect 13.600 RPM.

From the Table 2a, to achieve a max RPM of 14.000 RPM (operating limit for the 1 st
engine X30 version) a sprocket ratio between 7.83 and 8.05 should be used (having
used during the tests, a sprocket ratio of 7.7 and having achieved 13.600 RPM).

From Table 1, with these values, a sprocket ratio of 10:78 / 10:80 should be used or,
having a Z=11 on the engine sprocket, a ratio 11:87 should be used.