07 suzuki ltz 50 dynatek CDi won't work on limit-4
 

I have Suzuki ltz 50 -07 - the dynatek CDi will run on limit 1- which is the highest rpm curve top speed but won't go to limit 4 which is the slowest 4mph- dynatek has tested unit it tested good - & sent me a second unit it does the same thing - dynatek don't know what's up they neve had this ISSiue - & can't get much help - talked to a lot of people but no answer -? :thanks:trying to find somebody in the USA that has had this proulblm