Allright guys,
I've got a few questions regarding a few things on my mc21.
I still have an original airbox lid, no holes or cuts.

How many holes does one drill out to 20mm(?) Where abouts on the lid?
I noticed that the mc28 model has an airbox cover with 2 small pipes
On the sides of the intake tubes, do the do anything for airflow?


I got given a spare woodruff key that alters the ignition timing by 2 degrees
but I'm unsure which side of the key actually alters the timing?

I've done the orange wire splice and was wondering if it'd be easier
to do this mod without faffing around with the modded woodruff key?
Would the gains be the same?
One thing is cutting 3 wires, another is removing the flywheel, cover, fairing ect.

Where does one enquire about changing main jets, slow jets etc?
Cheers!