It would also help if you removed the sprocket cover and cleaned the chain lube/road gunk out of the clutch push mechanism. I use brake cleaner for this and then once clean relube with a good quality spray grease.... This will make a big difference to the clutch.
As i doubt the previous owner gave it much tlc i thought i'd do this today, oh my!!!!, i wish i'd taken a piccie, it was FULL of old chain oil/grit etc, so currently cleaning/relubeing now.
One question in all the gunk i found a 1 1/2" cylindrical white nylon bush, i'm guessing this is mean to go onto the gear selector rod? (pretty sure it was just floating in the gunk)
EDIT, Found some pictures and it does.
Next door is a childminder so will have to wait untillthe school run to see if its any different now (i'm sure the power/weight ratio will have improved!!)