the hit you are after is not by getting clutch to kick in early but to get it to kick in late, 50's develop all there power high up in rev range that is why if you get work done on 50 you should only worry about getting more top end.
The best way to get the most out of bike is to set clutch to come in at about 8500 rpm, if you set clutch to come in to early in rev range it will bog down.
next problem is that std clutch drum cant handle that as they only have 3 spot welds, either take drum to engineering shop and get it fully welded, or buy new drum from USA that is lighter and stronger. note: if you weld drum you will need shaft hole to be re-machined as it closes up during welding and you will not get it back on shaft.
then get stainless steel washer kit form USA that takes guess work out of setting when your clutch kicks in.
You will find that if you do top end ,then clutch properly you will pull higher gearing as well for open tracks.
Then drill extra holes in air box as they are pretty restricted and motor breathes better, you will notice change straight away.
with all this you then need to change oil more often and will wear out clutch
pads faster but you will have rocket.
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