Just got a new to me 2008 Speedster 150 with the Bimini Top, can't wait to get it in the water!
I have seen youtube dealer videos that stated you can go full speed with top up, but I take that with a grain of salt.
That being said, while admiring my boat in the garage I noticed the Bimini top was not quite strait on the top tubes. Pulling back the canvas, I noticed the tubes were not well joined in the middle with half the screws missing, and the others having come loose. Easily fixed: bought some stainless steel screws of the same type, put loctight blue on the inner metal tube joining the two tubes to prevent it from coming loose again, and re-installed 4 screws per tube.
Obviously with the tubes not properly joined on top, the whole thing would have collapsed under speed, and probably break the 4 attachment points!