Enriching Valve mod

I've seen it hinted at that this should be removed and a gasket used to seal it.  Anyone got the link or complete instructions please.  Carbs are coming off to do Scotch's air choke mod, so may as well do this as well.

Thanks!

Looking forward to a response to this--I'd love to hear a definitive answer. In my mind, simpler is always better!

Remove the cover - remove the "guts" - replace the cover with a solid gasket.  Done !   

Hi Scotch, if these valves go wrong ! what is the symptom ?

if these valves go wrong ! what is the symptom ?

Nothing can "go wrong"..  If you're experiencing back-fire - put the guts back in.  Check your mixture, timing and sync. first.  Mine have been blocked-off for 2 seasons now and the engine hasn't farted once.  And yes.....No Shit:  I gained 4-5 MPG.  This was one of 4 "tweaks" I did trying to gain mileage.  Eventually ended up with a consistent 52MPG @100KPH avg. riding identical runs of 272 Kilometers.  

Hi Scotch, My 13 has been on hold as life took over, feel guilty not feeding back after all the help you gave me, Hopefully be back on it once winter comes.