what you can do is lighten you clutch shoes by drilling a hole in the same location the same size in each one, start with holes about 1mm in diametre at the very tips of your clutch shoes, if they need to be lightened mor ethan drill thes holes out to 1.5mm. this will lighten the clutch shoes therefor making the engine have to spool up in order for the clutch shoes to engage.

Dann