Ultra MBX R2, Instruction Manual

3 X 8mm 
Washer     

3mm  Nylon  
Locknut           

3 x 5mm Screw        

3 x 20mm 
Cap Screw

* Place the clutch shoes
  with the clutch springs 
  over the 3 pins of the 
  flywheel.
  Using a screw driver as a lever,
  bend the small end of the
  clutch spring behind the 
  clutch nut and press 
  down to snap shoe in 
  place.

* Fit the flywheel using a cross
wrench or deep socket.

If engine turns when tightening,
hold piston with large thick tie-wraps
and hard wood in exhaust port.  
Do not use metal, it will 
damage engine.
    

#10098

SG Nut  & Shim kit

Engines with ground shafts and few threads
are called SG Shaft.  A special clutch nut is needed.  

The stock flywheel (#10040) is fine.

ASSEMBLY OF THE CLUTCH INTO ENGINE

3 x 10mm
Tapping Screw

#10016

Air Filter
Sponge
Refills

#10017 - Blue
#10018 - Yellow
#10019 - Rose
#10031 - Filter Cover

Foam Air filters

#10021 - Black
#10027 - Yellow
#10028 - Pink
#10029 - Blue

Air Filter Connector

Nylon Strap
   ( Small )

Nylon Strap
   ( Small )

You must oil foam filter before use.
Filter will not work if not oiled.

Clean with soap and water only.
You will damage foam if washed
if fuel!

ASSEMBLY OF THE AIR FILTER

#10100

Clutch Spring

#10010

Clutch Shoes
Black Type

* Shoes are
   trailing.

3 x 8mm
Washer
Misc. Hardware

#10099

#34110

5x10x4mm
Ball Bearing 

#34110

5x10x4mm
Ball Bearing 

#10040 (stock)

3 Pin
Flywheel, Taper

#10041

3 Pin
Flywheel, Hole

#10091

Clutch Nut
screw type

3 x 5mm
Screw

#10330

Brass, Corn (big hole)

#10329

Brass, Corn (sml hole)

3mm
Nylon Lock
Nut

3mm
Nylon Lock
Nut

3 x 20mm
Hex Screw

3 x 20mm
Hex Screw

#30480

Engine Mount

#10398 - 12T
#10399 - 13T
#10400 - 14T (stock)
#10401 - 15T
#10402 - 16T
#10403 - 17T
#10404 - 18T
Clutch Bells

SEE NOTES ABOVE

Notes:
Non-Pull Start Engines...
• Alum. Washer behind the flywheel is not needed when using Force engines or similar types.  O.S. Engines will 
require washer spacer.

• To check!..place the brass corn #10330 (big hole) against the engine bearing, then flywheel.  You should be 
covering one or two thread of the engine shaft.  If this is the case, you do not need an additional washer behind the 
flywheel.  

You must cut the engine shaft if too long.  Count 6 threads in front of the flywheel and mark.  This is all you need to 
tighten the clutch nut and mount the flywheel.

Force Pull Start Engine...
• Force Pull Start Engines required NO additional spacer and no shaft cutting.  The Force engines comes with an 
alum. cast driver washer, you use this part as the spacer, not the alum. washer shown for O.S. installs

But, you must find the #10329 brass corn (sml hole) for Flywheel.  This special corn fits the smaller thread 
diameter of the engine shaft.  It will center the flywheel when tightening the clutch nut.