hi.

about a month ago i got a 10plate superbyke rmr 125, it runs fine starts piece of piss etc. But for some reason i can only seem to get 50-55 mph out of it, i know there not known for doing over 100 like say a cagiva mito or something but there should do at least 65-70 i mean come on its a 125 ffs, two of my mates have a sinnis apache and a pulse adreanline, and they just leave me and thiers are standard too (the sinnis has the exhaust of a classic mini copper on it) but the pulse is bog standard.

(before i put it on the road i did a mini service replaced filters oil etc)

i thought maybe my air filter has some crap in it so checked that and its fine. Been told i could do with a new chain and sprocket as mines seen better days (think she done a little bit more than the 2700miles it says she done) i have no idea how much of a difference that could make ( this is my first bike newbie much ) was wanting a new pipe for it one of those little yoshimura ones on ebay :D how much difference do they make? ( cant afford atm no job?? (N)

Any suggestions will be brilliant!!