125 mph .................................
No , i get asked this , a lot , and this probably is not what you want to hear , but an RS125 with probably do around 100 mph maybe a bit more not 100% sure tbh never checked and do not really care , pretty similar to a Cagiva Mito , i have owned a Cagiva Mito 125 AND an Aprilia rs125 for over 10 years now , most own theirs less than a year .
whats more important is reliability , if you have a large budget then 40 bhp 120 mph is possible maybe , but if you are on a tight budget and need to get to work and back then wasting money on trying to make your rs faster in not clever .
Aprilia made these bikes pretty fast to begin with in fact spent a fortune getting them pretty much spectacular and fast enough for me anyway , by the time you get one for around £1500 used your bike is highly in need of major overhaul forget what the advert said most bikes i see for sale suggest recent rebuild (why rebuild an engine and then sell bike ??) , its the biggest mistake i see and the reason Cagiva Mito and Aprilia rs125 in fact most 2t bikes have reliability issue reputations , people buy a used example and then spend £300 on an exhaust another £30 on an air filter maybe other stuff of no real use ,they mostly fail to re-jet or upgrade to a 34mm carb , fail to test for piston wear , fail to service the bike or even fit a new spark plug , this is a recipe for failure .
you just added extra pressure on an already long overdue rebuild engine , and it WILL seize , it may seize anyway because of lack of maintenance .
be sensible buy your new bike get it fully serviced , have an complete rebuild of the engine done or do it yourself , have the jetting checked or do it it all yourself as you will learn a lot of stuff you will need to keep your bike running , drive it for a year then if you do have to worry about more speed you know at least you have a sound bike to work on , i have seen hundreds of kids and men fail this way , they spend all there money on rubbish like exhausts , air filters and carbon fibre fluff , and when a real problem occurs which it will quickly on a used bike they have to sell there bike as they cannot afford repair .
the first steps of any tuning is to get your bike to original factory specs , blueprinting , you will be amazed at the power you have .
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