No, the 810LED does not have a speed limit circuit. I own controllers that use the older 4 wire 810LED and also the newer 5 wire version, and neither pf the 810LED's can set speed.
Is this a bike with the UK speed limit of 25 km/hr (15.5 mph)? I sympathize.
THere might be a jumper wire on the controller that sets that limit, but I'm not going to advise looking to see if one exists. Some controllers are a rats nest of wiring and are best left alone, unless someone else has already blazed a path with the same model of bike. If you start tugging on wires randomly, it's a good way to break something,
Try the UK pedelecs forum
General discussion about electric bikes
www.pedelecs.co.uk