OFNA Racing Picco .21 Sport User Manual
OFNA/PICCO .21 SPORT
ENGINE
#51210 NON-PULL START
#51211 PULL START
Stop!! Carburetor LOW-END screw is 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 (3 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 3 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) - 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 on 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
# 51312
# 51316
# 51314
# 51317
# 51308
# 51309
# 51319
# 51306/51307
# 51305
# 51302
# 51301
# 51304
# 51303
#51401
# 51408
# 51404
# 51402
# 51407
# 51408
# 51406
# 51414
# 51412
# 51411
# 51413
# 51415
# 51409
# 51314
# 51310
# 51318
PICCO .21 SPORT PARTS
51301 P-1013 WIRST PIN, SPORT & COMP .21 2.95
51302 P-1014 RETAINER, WRIST PIN 0.95
51303 P-1021 PIN REF., CYLINDER 0.95
51304 P-1054 CONNECTING ROD, .21 SPORT 32.95
51305 P-1171 CYL / PISTON, .21 SPORT 64.95
51306 P-2014 HEAD GASKET, 23x16,4x0,1 1.50
51307 P-2068 HEAD GASKET, 23x16,4x0,2 1.50
51308 P-2029 SCREWS, HEAD, SPORT & COMP .21 2.95
51309 P-2705 OFNA HEAD, BLUE .21 SPORT 61.95
51310 P-2764 OFNA CASE, .21 SPORT 71.95
51311 P-3021 BEARING, FRONT SPORT & COMP.21 16.95
51312 P-3067 CRANKSHAFT, SPORT .21 THREADED 52.95
51313 P-????? CRANKSHAFT, .21 SPORT SG 54.95
51314 P-3071 BEARING, INSIDE 24.95
51315 P-5038 REAR COVER PLATE, SPORT .21 19.95
51316 P-5035 O-RING, REAR COVER 1.95
51317 P-6154 SCREWS, REAR COVER 1.95
51318 P-5041 CARB LOCKING PIN, SPORT .21 2.95
51319 P-2104 BUTTON, HEAD INSERT 7.95
# 51410
# 51403
# 51416
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, IDLE SET 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, LOW END, 7mm CARB 7.95
51412 P-6227 DRUM BARREL, 7mm CARB 14.95
51413 P-6291 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
# 51311
# 10330
COMPLETE CARBURETOR
# 51400
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