Nothing really, it's just gutless (nothing wrong with the bike at all, just needs more power) & doesn't handle well enough.
Fine as a rainy day commuter, but distinctly lacking any sort of presence or character.
Rear suspension is far too hard even on the softest setting, front end is OK, but anti-dive wouldn't work.
Fitted braided hoses all round & got all the air out, but the brakes were still not that good (calipers were all stripped cleaned & freed off properly.)
Frontal area looks like a 250.
Tappets are a pig to adjust without a special tool.
Would I have another one?
No.
The handling (stiff rear shok aside) was OK, but it had a propensity to throw itself down a bit too quickly in a bend, which could be compared to a hot labrador flopping itself on the floor.
Even with good tyres, it runs out of tread on the rear if you try to corner faster than it wants to go.
A yawn factor of 7 if you want to try & keep up with the bigger boys.
Try putting some air in the rear.