when the tracking is ok i can really fly along on it and it will roll backwards down my drive which has a slight slope quite easily . just before you picked it up i noticed it was not running backwards as well as it had been . i had not been able to get it going to well for a few weeks before you used it but put it down to me
. what makes me wonder is if all is well you should be going easily on the falt / downhill and having to work hard only uphill. i could maintain 10mph on the flat round here even with my weak legs for a mile or two