Has anybody been able to get one of these things to go real fast we have an 03 Honda cr125 Having problems with detonating which we have since cure, Head geasket blowing they burn away Jetting is spot on if any thing it is running rich std main is 430 we have fitted 450, Honda told us to run 490 which is far to rich. We have fitted a v-force reed block which help big time. Fitted a 2c pipe and muffler which makes a nice spread of power. Porting is STD just cleaned up. Bike has been to unreliable to do anything else at the moment. Any help will gratefully received. Nigel