just abou anything is more powerful and lighter than the cast iron 2stroke up twin chunk of junk that was originally fitted.
even if it was the same power of (16-24bhp), a motorbike would weigh about half that or the OE engine so would already be an improvement.
the 410cc' suzuki engines in the formula student car were kicking 45hp I think, from factory, with some wild tuning mod's a huge custom pipe, some minor interenal work, two rows of DTA controlled injectors and a 10ltr carbon fibre plenum, they are each knocking out about 68bhp
and about 65-70lb.ft of torque, which is very impressive for a bike engine.
I love the sound triumph 600's make (the 4pot 4stroke), but weigh to expensive and quite big. also they are not BAD enough.
If I go ahead with this the trabbie is going to be painted with stone chip paint or matt black paint in every orefice. with black this, black that, some badly black tint'd lights, a chrome stinger pipe, and err a bucket or two.
brakes will be left standard, but maybe some fat rims that rub on everything
its going to be mad, and under £500 T&T'd, or else it doesn't happen