PK50XL Malossi 75cc road kit


For a while, I bought the Malossi 75cc Road Kit for my PK 50xl.
I do not feel that it makes the big changes on the top speed and effect on the engine.
I haven't changed the crankshaft and ignition module.

What speed should I achieved on a flat road with this kit ?
And how big is the difference between stock crankshaft and with a crankshaft with longe fuel inlet time ?
What crankshaft is recommend to use together with this kit ?

the ignition module makes a big difference between the standard and one with adjustable timing setpoint?
Which ignition module would you recommend?
And what the weight of the flywheel is and prefer is going to drive 900 km this summer