OFNA Racing Picco .21 01 BP, SG Shaft User Manual

OFNA/PICCO .21 O-1 BP #51217

SG SHAFT WITH BOOST CHAMBER

Stop!! Carburetor screws are preset by factory.... Do not change until you read break-in

instructions .

NEW ENGINE BREAK-IN

Your OFNA 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 freer.

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% BLUE THUNDER
or 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 and over heat sleeve. Let engine run at a fast idle for one
tank to break-in connecting rod bearing before starting full break-in. Let engine cool down before continuing and never stop
engine with 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 setting (1 turn out from flush or more if
needed). 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, too a leaner point and in which the
engine runs at high RPM and power, but still keep max temp. of 250 deg. F. At 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. Temperatures of
300 Deg. and above will damage engine and shorten life.

STARTING NEEDLE SETTINGS

Master Needle Valve - main control for fuel mixture. Set at 3 to 3 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) - 7mm Carburetor, factory setting is " Turn needle in until is stops, do not over tighten. Now,
turn out counter clockwise 10.5 to 11.5 turns. 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.

USE LONG GLOW PLUG WITHOUT IDLE BAR,

(OFNA/PICCO #51007 PLUG) IS RECOMMENDED

51404

51402

REMOVEABLE VENTURI CARB.

#51419

51435

51436

51324

51339

51408

51335

51331

51432

51437
51306 - 0.1

51307 - 0.2

51302

51430

51431
51303

51314

51326
51320

51302

51337

51432

51422 - 7mm
51421 - 9mm

51338

51438

51420

51417 - 7mm
51418 - 9mm

51311
51434

51408

51401

51408

51407

51403

51424 - 7mm
51423 - 9mm

NEW CARBURETOR, 7mm

# 51426

NEW CARBURETOR with venturi , 9mm

# 51419

51413

51409

51425

51411 - 7mm
51425 - 9mm

VENTURI, 7mm - 51427

8mm - 51428
9mm - 51429

PICCO .21 O-1bp ENGINE PARTS

51430 WIRST PIN, O-1BP 3.95
51302 RETAINER, WRIST PIN 0.95
51303 PIN REF., CYLINDER 0.95
51431 CONNECTING ROD, O-1BP 58.95
51326 OFNA CASE, O-1 .21, BLACK 185.95
51432 OFNA HEAD, O-1 BP 95.95
51433 CYL / PISTON, .21 O-1 BP 195.95
51306 HEAD GASKET, 23x16,4x0,1 0.95
51307 HEAD GASKET, 23x16,4x0,2 0.95
51320 CARB LOCKING PIN, ALL ENGINES 4.95
51331 SCREWS, HEAD, ALL ENGINES 6.95
51324 SCREW POST, BOOST BOTTLE NIPPLE 8.95
51311 BEARING, FRONT SPORT & COMP.21 & O-1’S 19.95
51434 CONE, O-1BP, SG 0.95
51435 CRANKSHAFT, .21 O-1BP, SG 109.95
51314 BEARING, INSIDE SPORT & COMP .21 &O-1’S 29.95
51436 SEAL, REAR COVER 1.95
51335 REAR COVER PLATE BOOST CHAMBER 44.95
51437 BUTTON, HEAD INSERT O-1BP 31.95
51337 FUEL FITTNG GASKET, 2 PCS. 0.95
51338 FUEL FITTNG TORQUE 2.95
51408 WASHERS, ALUM. 2 PCS. 1.95
51339 NIPPLE, FUEL FITTING 0.95
51438 O-RING, CARB. CASE PORT 1.95

PICCO CARBURETOR PARTS ( NEW NYLON BODY) STARTING
JANUARY 2002

51417 CARB BODY, NEW, NYLON 7mm 39.95
51418 CARB BODY, NEW, NYLON, WITH 9mm VENTURI 39.95
51404 NEEDLE, MASTER SPORT & COMP 21 & O-1 2.95
51402 O-RING, M.NEEDLE, 2 PCS. 0.95
51407 HOUSING, MASTER NEEDLE 3.95
51408 WASHERS, ALUM. 2 PCS. 1.95
51401 FUEL FITTING 2.95
51420 SPRING, AIR SCREW 1.95
51421 SCREW, AIR SCREW REG. P21 9mm 1.95
51422 SCREW, AIR SCREW REG. P21 7mm 1.95
51423 DRUM BARREL, 9mm CARB 16.95
51424 DRUM BARREL, 7mm CARB 16.95
51403 O-RINGS, 4x2mm 6 PCS. 2.95
51409 SET SCREW, 3x3mm 0.95
51411 MIN NEEDLE, 7mm CARB 7.95
51425 MIN NEEDLE, 9mm CARB 7.95
51413 BALL JOINT CAP 7.95
51415 BARREL BOOT, SILICONE 3.95
51426 CARBURETOR, COMPLETE 7mm 66.95
51419 CARBURETOR, COMPLETE 9mm VENTURI 68.95
51427 VENTURI, 9mm, 2 O-RINGS 13.95
51428 VENTURI, 8mm, 2 O-RINGS 13.95
51429 VENTURI, 7mm, 2 O-RINGS 13.95