Ofna Racing ULTRA GT LX Manual - page 11

ENGINE BREAK-IN AND TUNNING

(BREAK-IN THE ENGINE BEFORE DRIVING THE CAR!)

OPTIONAL OFNA CAR STANDS

TUNING AFTER BREAK-IN

Idle adjuster screw &

Barrel Stop

Lean

Rich

• Choose a wide clear outdoor location with low dirt and dust.

• Set the car on box or holder with wheels off the ground.

• Turn on radio and car.  Make sure throttle is at idle position.

• Fill fuel tank and set master engine needle.

• Prime fuel line and Heat glow plug before pull starting engine.

• When started, let engine fast idle for two tanks of fuel.

Close master needle by turning clockwise until it stops.  

Then open needle by turning counterclockwise 3 turns 

(rich setting). 

When running car, adjust carb with 1/8 clockwise turns, 

slowly leaner, until the top speed good.  Check engine 

temp, if possible, for no more 250 degrees.

Adjust barrel stop so it will not close, accept for a small gap.  

This gap will be the idle setting.  You will notice the idle will 

increase with a wide gap.

Adjust low end needle for best throttle response.  Use only 

small turns.  From idle, give it full throttle, if throttle is slow 

lean out needle until good.

WOOD BLOCK

3 x 10mm Flat Head

                 Tapping Screw

3 x 15mm  Flate Head 

           Tapping Screw

3 x 20mm  Flat Head

           Tapping Screw  

3 x 25mm Flat Head 

           Tapping Screw 

3 x 25mm Tapping Screw

3 x 20mm Tapping Screw

3 x 15mm Tapping Screw

3 x 5 mm Flat Head

         Screw

3 x 10 mm Flat Head 

                  Screw

3 x 15mm Flat Head 

                 Screw

3 x 20mm Flat Head

                 Screw 

3 x 25mm  Flat Head

           Screw

3 x 5mm Tapping Screw

3 x 8mm Tapping Screw

3 x 5mm Cap Screw 

3 x 10mm Cap Screw

3 x 12mm Cap Screw

3 x 15mm Cap Screw

3 x 20mm Cap Screw

3 X 25mm Cap Screw

4 x 10mm Tapping Screw

4 x 15mm Tapping Screw

4 x 15mm Tapping Screw

                 ( Small Head ) 

4 x 20 Tapping Screw

4 x 25mm Tapping Screw 

4 x 20mm Flat Head 

                 Tapping Screw 

4 x 16mm Flat Head

                 Tapping Screw 

4 x 10mm Flat Head

                 Tapping Screw 

4 x 20 mm Flat Head Screw 

4 x 15mm Flat Head Screw

4 x 10mm Flat Head Screw

4 x 6mm Flat Head Screw

3 X 8mm Washer

M3 Nut

5 X 9mm Washer 

5 X 10mm Washer

5 X 12mm Washer

2mm X 7mm Washer

2 X 6mm Washer

M4 Nut

M4 Nylon Kocknut

M3 Nylon Locknut

3 x 3mm Set Screw

3 x 5mm Set Screw 

3 x 8mm Set Screw

3 x 10mm Set Screw

3 x 15mm Set Screw 

4 x 4mm Set Screw

4 x 10 mm Set Screw

5 x 5mm Set Screw

3 x 30mm Screw Pin

                 ( Silver ) 

3 x 30mm Screw Pin

                 ( Black )

3 x 5mm Screw

3 x 10mm Screw 

3 x 15mm Screw

3 x 20mm Screw 

3 x 30mm Screw

2 x 10mm Screw

2 x 8mm screw

2 x 6mm Screw

2 x 5mm Screw

2 x 4mm Screw

2 x 25mm Screw

2.5mm E-Ring

2mm E-Ring

3 mm E-Ring

5 mm E-Ring

6 mm E-Ring

7 mm E-Ring

0              10             20             30             40             50

mm

0              10             20             30             40             50

mm

1:1 SCREW SHEET

4 mm E-Ring              

3 x 12mm Tapping Screw

3 x 10mm Tapping Screw

M3  Flange  Nut          

       ( Steel )