oh - you "got it made"?
hm, this is missing on the website, isn't it? Will try to pull the bike out of its 'parking' to take photos of the filter
All you need is cissors/cutter and the 'Universal' Twin air 'double' filter (see link)
when you go desert (the real thing - sand everywhere):
foam strips (used to seal doors) sticked to the inner airbox where it's in contact with the cover (to prevent bypassing of dust)
if I remember correctly there's a water drain hole in the inner box: cover with duct tape (from outside) or a plug
leave the 'oil film' (from engine breathing) on the bottom of the inner airbox to catch dust
pull a lady stocking over the schnorkel
some more tips (only tips, no divine wisdom - everyone has his own experiences):
replace the handle bar with a quality MX bar (the original iron pos *will* bent)
closed protectors (Polisport Universal Exura look nice on Atlas and are suprisingly solid for plastic protectors)
secure the wind shield (replace plastic rivets with bolts) - or take it off (or will get lost)
replace indicators with 'smaller' ones (plyable MX indicators)
smaller front sprocket (to gain at least a little bit of torque)
add loctite 660 between sprocket and shaft - it will 'dampen' the wear of the splines (Atlas weakness) at least a little bit (660 is expensive but replacing the shaft is impossible as shafts don't exist anymore). This has to be repeated every 2-3000 km
P.S. one more thing: the 'rod' that holds the airbox cover: this is stupid fiddeling:
One can replace the rod by a a long bolt: fix it permanently with two self securing nuts (+ washers + 'rubber washers', e.g cut from an old bycicle tire tube) on the rear side of the inner box: like a sandwitch: nut - washer - rubber - airbox wall - rubber - washer - nut
On the 'front side' (cover) use a butterfly nut (+ washer) to screw the cover onto the airbox. This allows to open the box quickly without tools
Buy your Twin Air 600 x 300 x 15mm Orange/White Universal Dual Stage Foam online at MXstore. Australian owned, amazing service & fast free shipping* on over 100,000 products.
www.mxstore.com.au