Bike sputtering, not very powerful

[lukehanham]

Hello, i've still got my gilera rcr 50 and am having some issues.

The bike is sputtering in any rev range and has trouble making it up the smallest of hills.

When i ride along and i am in high revs the engine will sometimes just stop pulling so i have to clutch in and then give it a few revs, after that it will go again.

It's not too powerful and when i take my spark plug out it is fairly oily so i guess it is running rich.

I cleaned the carb today and still no difference?

Here is a service manual which i used to set the carb to the correct settings.

https://scootergrisen.dk/scooterhjemmeside/download/gilera_smt_rcr_servicemanual.pdf

I have not ridden the bike much after these issues in case i do any damage.

[moonzoomer]

Has the bike been modified in any way? possibly worn piston/rings and/or bore, leaking head gasket, damaged carb to cylinder inlet manifold, clogged exhaust system, airbox and air filter, poor spark (check plug cap /ht lead and generators coils if spark is poor) or worn crankcase oil seals, the list is endless so just work your way through the basics first.

[lukehanham]

Yes, it has been rebored and had a new exhaust, also the air filter bike was cut short and there is no filter or box, just tape that 'restricts' the flow.

[moonzoomer]

[lukehanham]

Okay, i will order those when i have the money.

This is my spark plug condition ( Rich AF )

Any idea how i can stop this?

https://puu.sh/gVIlY/91135ab244.png