OFNA Racing Picco .21 Boost User Manual
51605 SG
OFNA DESCRIPTIONS RETAIL OFNA DESCRIPTIONS RETAIL
51303
PIN REF., CYLINDER 1.95
51453
SEALS, O-RINGS, CARB 1.95
51306
HEAD GASKET, 23x16,4x0,.1mm 1.95
51455
HOUSING, MASTER NEEDLE (NEW) 6.5
51307
HEAD GASKET, 23x16,4x0,.2mm 1.95
51489
O-RING VENTURI 1.95
51311
BEARING,FRT SPT & CMP.21,.21P7 29.95
51514
CLIPS, WRIST PIN RETAINERS 10 7.95
51320
CARB LOCKING PIN .21-.28 8.95
51523
O-RING, CARB. 2PCS. 0.99
51356
O-RING, CARB LOCK PIN 2.95
51600
PISTON/SLEEVE .21 BOOST TURBO 195.87
51365
WRIST PIN, P9R,P7R EVO2,EVO3 10.95
51601
HEAD BUTTON,CONIC INSERT BOOST 73.9
51366
CONNECTING ROD, P9,P7-EVO2 68.95
51602
HEAD, BOOST .21 OFF-ROAD 113.32
51379
DRUM FOR NEW .28 CARB 2009 33.95
51603
SCREW, HEAD .21 BOOST 10PCS 14.95
51383
IDLE SCREW .28 JL NEW 2009 4.95
51604
CRANKCASE BOOST .21 159.95
51384
BALL JOINT CARB .28JL 15.95
51605
CRANKSHAFT, BOOST,EVO3,EVO MOD 258.95
51386
NEEDLE HIGH SPEED NEW .28 2009 5.95
51606
BACKPLATE, BOOST BLUE 42.95
51387
O-RING RED MAX NEEDLE NEW 2009 2.99
51607
SCREWS, BACKPLATE BOOST 4PCS 5.25
51401
FUEL FITTING 4.95
51608
MANIFOLD GASKET IN-LINE BL 2PC 13.80
51402
O-RING, M.NEEDLE, 2 PCS. 1.95
51609
CARB. 6-7MM BOOST COMPLETE 107.95
51403
O-RINGS, 4x2mm 6 PCS. 4.95
51610
LOW END NEEDLE NEW 2010 14.95
51408
WASHERS, ALUM. 2 PCS. 1.95
51611
CARB BODY PLASTIC BOOST 2010 59.95
51409
SET SCREW 3x3mm 0.95
51612
SILICONE RUBBER BOOT BOOST 9.95
51434
CONE, SLIT, ALL ENGINES 1.95
51613
VENTURI 6MM CARB BLUE 9.95
51436
SEAL, REAR COVER, ALL ENGINES 2.95
51614
VENTURI 7MM CARB BLUE 9.95
51449
BEARING, 14mm INSIDE .26,21P7R 59.95
51212 .21 BOOST PART LIST
51436
51606
51317
BOOST .21 TURBO BUGGY OFF-ROAD
Part: #51212
TECHNICAL DATA:
•Cubic capacity....................3.49cc •Rpm.............................38500
•Stroke....................................16.8 •Hp.....................................2.5
•Bore........................................16.26 •Weight..........................330gr
51386
51402
51387
51603
51602
51601 turbo
0,1mm 51306
0,2mm 51307
51514
51365
51366
51303
51603
51600 turbo
51383
51455
51408
51401
51403
51403
51379
51384
51612
51409
51610
51611
51449
51604
51356
51320
51320
51453
(insert o-ring inside
cranckase)
51523
51311
51434
51609 COMPLETE CARB.
51613 6mm VENTURI
51614 7mm VENTURI
51489 O-Ring for VENTURI
BOOST .21 TURBO BUGGY OFF-ROAD
Part: #51212
Stop!! Carburetor screws are preset by factory.... Do not change until you read break-
in instruction.
NEW ENGINE BREAK-IN
Your OFNA Picco engine is extremely tight when the piston is at the top of the stroke and turning the crankshaft by hand.
This is normal for a new ABC type engine. The piston and sleeve are matched for fit and the top of the sleeve is tapered for
a tight fit. As you run your engine, this tightness should diminish. There is no cause for alarm, because as the engine
warms up, the brass sleeve will expand faster than the aluminum piston and the engine will turn more freely.
As with any new engine, there are many high spots and tight fits in the matching process. High spots create hot spots
that must be broke-in. Therefore, the break-in process is very important to provide good service by the OFNA engine.
So, you must run the engine rich (COOL) for the first three tanks of fuel. We recommend using one gallon of 20%
BYRON'S 2000 as break-in fuel. Other break-in type fuels or added oil is NOT needed. DO NOT OVER REV THE
ENGINE WHEN FIRST STARTING, this could break the piston, rod and over heat the sleeve. Let engine run at a medium
idle for one tank to break-in the connecting rod bearing before starting full break-in. Let the engine cool down before
continuing and never stop the engine with the piston at top of the cylinder. This cool down period is for heat cycling the
parts.
Break-in the engine in the car, by running the engine at a rich master needle or factory setting, 3 turn out from close.
Run the car from a slow to fast speed with short bursts of speed. You need to buildup a little heat (warm to the touch)
in the engine, but not too hot. In a rich setting (2 or more turns), the engine will run cold. In the leaner setting (2 or
less turns), the engine runs hotter. Do not heat up the engine too much at this time, let it cool down if too hot. After about
one (1) tank, turn the Master Needle Valve, clock wise, 1/8 of a turn leaner or clockwise. Keeping the fuel tank full, continue the process until you slowly turn the Master Needle Valve, 1/8 of turn each time, to a leaner point and at which the
engine runs at high RPM and power, but still keep max temp. up to 250 deg. F. If you reach this point you must stop, too
lean of a setting will heat up engine and damage the piston. A normal operating temperature is around 210 to 250 Deg.
Tempertures of 300 Deg. and above will damage engine and shorten life.
STARTING NEEDLE SETTINGS
Master Needle Valve - main control for fuel mixture. Set at 2 to 2 1/2 turns from closed or flush with collar. Adjust this
needle for maximum RPM and power without being too lean or too hot. Make sure you start at bottom of needle seat!!
Barrel Needle (Low Speed) - Carburetor, factory setting is " Turn needle in until is stops, do not over tighten. Now,
turn out counter clockwise until flush with body of carb. This needle is in the center of the carburetor barrel and provides
throttle response. It is not the idle adjustment. Turning screw "IN" is Lean and "Out" is Rich. Do not adjust this needle until the
Master Needle is set for power and best performance. This needle will only effect throttle response, so adjust needle until
throttle response is clean with little or no delay. Once set, do not continue to turn (lean) needle further. This is important
since continuing to turn needle will only increase engine temp, at lower RPM, which will throw off engine overall tuning.
Barrel Stop Screws - Used for adjusting Idle. Set for 1/16th inch gap to start new engines. You can open more for faster
idle.
SUGGESTED TURBO GLOW PLUG TO USE
#51013 - T4 TURBO HOT
#51014 - T5 TURBO MEDIUM
#51015 - T6 TURBO COLD
OFNA RACING
7 VANDERBILT
IRVINE, CA 92618
PHONE: 949-586-2910
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