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at the 4-5 gear changing, the spark timing is pulled too much.

Is it due to the rev. limit? the highest peak of RPM before the point, it is just 6590 RPM as I set the cutoff at around 7000~7100 RPM.

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and the schedule of shifting is like the above.

1. What factors are limiting the rev?
2. I would like to change the shifting point like 6800 RPM.
What should I need to change?

Thank you in advance.