Depending on how you mod it, up to 9800 RPM.
6M6 CDI (650 models) 6500-6600 rpm limiter
61X CDI (701 94/95) 7050-7150 rpm limiter
62T CDI (701 96+) 7050-7150 rpm limiter
There are 4 different solutions to choose from.
1 - Adjustable rev limiter with trim pot, 7200 - 9800 RPM.
2 - Fixed limit but raised to 8100 RPM
3 - fixed limit customized by replacing the resistor with specific valued resistors
4 - Limit deleted all together.
More info here;
http://www.x-h2o.com/index.php?threads/superjet-cdi-modification.496/