Hi, I own a WR450 2007 since 2011 (bought it used) , noticed that the previous owner already did the free mods (AIS removal, grey wire , etc)
it's been running fine since i bought it, but back in 2011/2012 I remember it could reach 120kph (74mph) fine, and if I gave it a little more throttle it would reach 130/135kph (although at very high rpms, but hey, it's normal ) - checking just by looking at odometer
Now, I bough a FMF factory 4.1 and noticed it performs better in low and mid range , but checking with GPS I saw that it could barely get to 90kph (55mph) that it was running already at very high rpm, I've tried connecting the grey wire and somehow i noticed it was even better at low range (dont ask me why)
What might be the problem for not getting nowhere near 100kph ?
PS: i cannot compare the GPS with the odometer now , because the battery of my bike is running bad, and odometer displays 199kph even when im at no movement at all (dont have money to buy a new one for now, and it runs fine just by kick starting it, and sometimes even e-start works) but for "sure" it's not the GPS that's wrong.