On here we have had some ludicrous claims for speeds from 125s, one muppet even claimed he had 100+ out of his, needless to say he got laughed at a lot. You have to remember it is only a little bike and has a lump (no disrespect intended) sat on it plus wind resistance all of which gangs up on the bike to make it struggle up to 70mph, which by the way is bloody fantastic when you think about it, don't know why it won't rev past 8K but bet it's so that the engine does not self destruct. Some lads on here have similar bikes to you and they really like this little bike and use it to learn how to ride before they go on to take their test and buy a bigger CC bike, the point I'm trying to make is that you can throw loads of cash at these little bikes and maybe add 10 or 15MPH to the top end but they are designed to go only so fast, if you reach the point where your doing more than the design was intended for you going to be buying a new engine every few weeks. Save your money and pass the test, buy a bigger bike and pass yours on (in the original condition) to the next guy to do the same.