i do know that the guys at cen run 30% werks or byrons fuel .
Glow plugs:  short hot or short medium hot,   if you use McCoy   MC59   use 2 copper rings
top end: 31/2 turns out               with your own touch
bottom end: flush                        with your own touch
fuel filter: du-bro #2305  optional

you NEED to change the clutch compressor springs to the  HARD  NICKEL  #GS099 as soon as the gold wear out. about 1 to 2 gallons fuel.pg6

O.K. now go in your manual to the second and third adjustments  ( pgs:  6 and 8  )  cross them out and don't look back.. the actual settings are

2nd speed:  set screw = flush with the clutch shoe
                       springed  = 21/2 to 3 turns out                         with new springs    

3rd speed:   set screw = flush then a 1/4 turn in
                       springed  = 6 turns out                                       with ne w springs

keep in mind that the piston sleeve is NOT a pinched sleeve.  its a new type

 All this info came from days and hours of sitting on the phone with CEN.  So, YES! direct from CENracing 
if for any reason you need tech support from them ask to talk to Andrew.   He's the best they got And he's willing to help.  He's cool!!!

Unfortunately i've only got to drive mine maybe 3 times but those 3 times were awesome. I got mine for Xmas2009.

#1 thing to know is there is a 60day warranty..