OFNA Racing Picco .21 Comp User Manual

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

			# 51404
				# 51413
	# 51331		# 51402	# 51415
			# 51407
	# 51332
	# 51336
# 51334	# 51306/51307			# 51406
			# 51408
		#51401
# 51316				# 51403
			# 51411
				# 51412
	# 51302	# 51329
		# 51408
# 51338	# 51301			# 51414
	# 51330	# 51410
	# 51303
# 51337				# 51416
# 51335		# 51409
				COMPLETE CARBURETOR, 7mm
	# 51314	# 51339		# 51400
	# 51333		# 51311
	# 5xxxx		# 10330

PICCO .21 COMP ENGINE PARTS

PICCO CARBURETOR PARTS ( NYLON BODY)

	51301	P-1203	WIRST PIN, SPORT & COMP .21	2.95	51400	P-6307	CARBURETOR,COMPLETE7mm	61.95
	51302	P-1014	RETAINER, WRIST PIN	0.95
					51401	P-6035	FUEL FITTING	2.95
	51303	P-1021	PIN REF., CYLINDER	0.95
					51402	P-6070	O-RING, M.NEEDLE, 2 PCS.	0.95
	51330	P-1097	CONNECTING ROD, .21 COMP
					51403	P-6080	O-RINGS, 4x2mm 6 PCS.	2.95
	51329	P-	CYL / PISTON, .21 6+2 (P8) COMP	-
					51404	P-6101	NEEDLE, MASTER SPORT & COMP 21	2.95
	51306	P-2014	HEAD GASKET, 23x16,4x0,1	1.50
					51405	P-6110	SCREWS, CARB 2.5x10mm 2 PCS.	0.95
	51307	P-2068	HEAD GASKET, 23x16,4x0,2	1.50
					51406	P-6121	AIR SCREW, LOW END	1.95
	51331	P-2101	SCREWS, HEAD, COMP .21	2.95
					51407	P-6165	HOUSING, MASTER NEEDLE	3.95
	51332	P-7505	OFNA HEAD, BLUE .21 COMP
					51408	P-6175	WASHERS, ALUM. 2 PCS.	1.95
	51333	P-2719	OFNA CASE, .21 COMP
					51409	P-6186	SETSCREW,3x3mm	0.95
	51311	P-3021	BEARING, FRONT SPORT & COMP.21	16.95
					51410	P-6189	SIDE BODY, ALUM. 7mm CARB	21.95
	51334	P-3074	CRANKSHAFT, .21 COMP, SG	49.95
					51411	P-6222	MIN NEEDLE, 7mm CARB	7.95
	51314	P-3071	BEARING, INSIDE SPORT & COMP .21	24.95
					51412	P-6227	DRUM BARREL, 7mm CARB	14.95
	51316	P-5035	O-RING, REAR COVER	1.95
					51413	P-6297	BALL JOINT CAP	7.95
	51335	P-5777	REAR COVER PLATE BOOST CHAMBER
					51414	P-6308	CARB BODY, NYLON 7mm	33.95
	51336	P-2108	BUTTON, HEAD INSERT
					51415	P-6312	BARREL BOOT, SILICONE	3.95
	51337	P-6006	FUEL FITTNG GASKET, 2 PCS.
					51416	P-6380	O-RING,8x6mm	0.95
	51338	P-6035	FUEL FITTNG TORQUE
	51339	P-6099	NIPPLE, FUEL FITTING	1.50