my motors are capable of 8500 seen it a time or two. The video 6700 to 7200 had the carbs a bit fat and it was fluttering in that range. NEW motor kinda use it for a rev limiter. Didn't wanna turn it no more, I missed the gearing dropped from a 5.8 to 4.8 and the track was so much faster the second time out it was like I didn't change the gearing at all. shoulda geared it bout a 4.0