OFNA/PICCO .21 COMP
ENGINE
#51215 .21 SG 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 (2 1/4 turns 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, 1/16 of a turn leaner or clockwise. Keeping the fuel tank full, continue the
process until you slowly turn the Master Needle Valve, 1/16 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 220 to 270 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 2 to 2 1/2 turns from closed. 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
# 51334
# 51316
# 51337
# 51338
# 51335
# 51331
# 51332
# 51336
# 51306/51307
# 51302
# 51301
# 51330
# 51303
# 51314
# 51333
# 5xxxx
# 51329
# 51408
# 51409
# 51339
#51401
# 51410
# 51404
# 51402
# 51407
# 51408
# 51411
# 51311
# 10330
# 51413
# 51415
# 51406
# 51403
# 51412
# 51414
# 51416
COMPLETE CARBURETOR, 7mm
# 51400
PICCO .21 COMP ENGINE PARTS
51301 P-1203 WIRST PIN, SPORT & COMP .21 2.95
51302 P-1014 RETAINER, WRIST PIN 0.95
51303 P-1021 PIN REF., CYLINDER 0.95
51330 P-1097 CONNECTING ROD, .21 COMP
51329 P- CYL / PISTON, .21 6+2 (P8) COMP 51306 P-2014 HEAD GASKET, 23x16,4x0,1 1.50
51307 P-2068 HEAD GASKET, 23x16,4x0,2 1.50
51331 P-2101 SCREWS, HEAD, COMP .21 2.95
51332 P-7505 OFNA HEAD, BLUE .21 COMP
51333 P-2719 OFNA CASE, .21 COMP
51311 P-3021 BEARING, FRONT SPORT & COMP.21 16.95
51334 P-3074 CRANKSHAFT, .21 COMP, SG 49.95
51314 P-3071 BEARING, INSIDE SPORT & COMP .21 24.95
51316 P-5035 O-RING, REAR COVER 1.95
51335 P-5777 REAR COVER PLATE BOOST CHAMBER
51336 P-2108 BUTTON, HEAD INSERT
51337 P-6006 FUEL FITTNG GASKET, 2 PCS.
51338 P-6035 FUEL FITTNG TORQUE
51339 P-6099 NIPPLE, FUEL FITTING 1.50
PICCO CARBURETOR PARTS ( NYLON BODY)
51400 P-6307 CARBURETOR, COMPLETE 7mm 61.95
51401 P-6035 FUEL FITTING 2.95
51402 P-6070 O-RING, M.NEEDLE, 2 PCS. 0.95
51403 P-6080 O-RINGS, 4x2mm 6 PCS. 2.95
51404 P-6101 NEEDLE, MASTER SPORT & COMP 21 2.95
51405 P-6110 SCREWS, CARB 2.5x10mm 2 PCS. 0.95
51406 P-6121 AIR SCREW, LOW END 1.95
51407 P-6165 HOUSING, MASTER NEEDLE 3.95
51408 P-6175 WASHERS, ALUM. 2 PCS. 1.95
51409 P-6186 SET SCREW, 3x3mm 0.95
51410 P-6189 SIDE BODY, ALUM. 7mm CARB 21.95
51411 P-6222 MIN NEEDLE, 7mm CARB 7.95
51412 P-6227 DRUM BARREL, 7mm CARB 14.95
51413 P-6297 BALL JOINT CAP 7.95
51414 P-6308 CARB BODY, NYLON 7mm 33.95
51415 P-6312 BARREL BOOT, SILICONE 3.95
51416 P-6380 O-RING, 8x6mm 0.95
OFNA/PICCO .21 SPORT/COMP
ENGINE
7MM CARBURETOR ADJUSTMENTS
This special carburetor has the high heat nylon body to counter act heat
from the engine that may boil the fuel before entering the engine. Over
heated fuel causes tuning problems that are hard to resolve. This new
design will give you much better performance.
figure 1
IDLE GAP - Shown in fig 1, you can see the idle gap.
Adjust idle screw to increase or lower engine idle. Never let
barrel fully close or adjust idle from only radio.
FACTORY SETTING - .5mm (.20)
THROTTLE LINKAGE BALL
figure 2
IDLE SCREW
FUEL INLET NIPPLE
You should never see fuel leak
from this area.
LOW END NEEDLE - Shown fig. 2 is the Low End Needle, which is
preset by Picco. You can adjust this needle after break-in if needed.
When turning this needle, make only small 1/16 turns.
FACTORY SETTING - TURN IN UNTIL STOPS, DO NOT OVER
TIGHTEN. TURN COUNTER CLOCKWISE 10.5 TO 11.5 TURNS
MASTER NEEDLE - Adjust this needle for best power and temp. The preset setting
should be 2 to 2 1/8 OUT. It is recommended to turn this needle "OUT" during
break-in (richer mixture) if engine is too hot.
FACTORY SETTING - 2.5 TURNS OUT.
LIMITED WARRANTY
THE OFNA/PICCO ENGINE IS GUARANTEED AGAINST ALL PRODUCTION DEFECTS BY PICCO MICROENGINES,
MONZA, ITALY. ANY DAMAGE CAUSED BY THE BELOW LIST ARE NOT A PRODUCTION DEFECT AND ARE
DEEMED MISHANDLING.
- OVER HEATING
- OVER RPM OR SUSTAINED RPM
- FAILURE TO BREAK-IN ENGINE BEFORE HIGH RPM
- WATER IN FUEL
- RUST INSIDE OF ENGINE
- DUST OR DIRT INSIDE ENGINE
- SCRATCHES IN ENGINE CAUSED BY DIRT OR DUST
- DAMAGED PISTON DUE TO PISTON STOP DEVICES
- DAMAGED CYLINDER EXHUAST PORT DUE TO PISTON STOP DEVICE
- DAMAGED PISTON DUE TO GLOW PLUG FAILURE
- BROKEN CRANKSHAFT OR ROD OR PISTON DUE TO LOOSE FLYWHEEL
- RUNNING ENGINE WITHOUT FLYWHEEL
- BREAKAGES AT HIGH RPM WITHOUT ENGINE LOAD
IF FOR SOME REASON YOU DAMAGED YOUR ENGINE, SEND IT TO OFNA RACING AT THE ADDRESS BELOW.
ENGINE NOT DEEMED UNDER WARRANTY WITH BE CHARGED A REBUILD FEE OF $65.00. THIS FEE MUST BE
PAID IN ADVANCE PRIOR TO STARTING REPAIRS.
WHEN SENDING YOUR ENGINE, MAKE SURE THE RETURN SLIP IS FILLED OUT IN FULL, OTHERWISE YOUR
ENGINE WILL BE RETURNED. ALWAYS INSURE YOUR PACKAGE. OFNA IS NOT RESPONSIBLE FOR LOST
PACKAGES IF NOT SIGNED FOR BY OFNA.
IT IS NOT NECESSARY TO REMOVE CLUTCH OR ENGINE MOUNTS, BUT RECOMMENDED YOU DO SO. BUT,
DO NOT SEND MANIFOLD/PIPE OR CAR KIT WITH PRIOR PERMISSION FROM TECHNICAL DEPT MANGER.
OFNA RACING (949) 586-2910
TECHNICAL DEPT.
22692 GRANITE WAY, STE. B
LAGUNA HILLS, CA 92653
ENGINE RETURN INFORMATION SLIP (ENGINE MUST BE FULLY ASSEMBLED WHEN SENT)
NAME
__________________________________________________________________________________________
ADDRESS
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CITY STATE ZIP
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