OFNA Racing 15 R User Manual
FORCE 15R STOCK(P3)
FORCE 15R OUTLAW, P8
FORCE 15R, PULL START
Thank you for purchasing a OFNA engine. We appreciate your choice and know you will enjoy running it. Please
note that theForce information in engine box is subject to change with not notice.
Carburetor Low end and barrel stop screws are pre-set by factory.... Do not change until break-in is done.
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 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.
Break-in the engine in the car, by running the engine at a rich setting. Run the car from a slow to fast speed with
short bursts of speed. You need to build-up a little heat in the engine, but not too hot. In a rich setting, the engine
will run cold. In the leaner setting the engine run hot, this is not good yet. Do not heat up the engine too much at
this time. 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 220 to 270 Deg. Temperatures of 300 Deg. and above will damage engine and shorten life.
NEEDLE SETTINGS
Master Needle Valve - main control for fuel mixture. Set at 1 1/2 to 2 turns from closed. Adjust this needle for
maximum RPM and power without being too lean or too hot.
Side Carburetor Needle (Low Speed) - This needle is in the center side of the carburetor and provide throttle
response. It is not the idle adjustment. Set FLUSH with the brass sleeve. Turning in is Lean and Out is Rich. Do
not adjust this needle until the Master Needle is set for power and top speed. This will only effect throttle response.
Barrel Stop Screws - Used for adjusting Idle. Set for 1/16th inch gap to start new engines. You can open more for
faster idle.
GLOW PLUGS - Use MC-09 or O.s. 08 glow plugs.
OFNA RACING , 22692 GRANITE WAY, STE. B, LAGUNA HILLS, CA. 92653 (949) 586-2910
FORCE 15R STOCK(P3)
FORCE 15R OUTLAW, P8
FORCE 15R, PULL START
FORCE .15
52510 FM-1501 HEAD, TALL BLUE 38.50
52511 FM-1501-1 HEAD, BUTTOM REPLACEMENT 10.95
52540 FM-1504/5-4P CYLINDER SLEEVE AND PISTON, 3 PORT 64.95
52560 FM-1506 CONNECTING ROD (ALUM. 7075S) 14.95
52570 FM-1507 CRANKCASE, FORCE 29.95
52580 FM-1508OFNA CRANKSHAFT, OFNA 29.95
52590 FM-1509 REAR BACK COVER 6.25
52591 15RS-PART B REAR BACK PLATE UNIT, PULL START 24.95
52599 15RS-PART B PULL START UNIT W/ ROPE 24.95
52600 FM-1510 CARBURETOR SET PIN 3.25
52610 FM-1511 SLIT BRASS CONE(SAME AS 10330) 2.95
52630 FM-1513OFNA CARBURETOR BODY 11.75
52631 FM-15131 OFNA CARBURETOR COMPLETE, OFNA 61.95
52640 FM-1514 THROTTLE BARREL 6.75
52650 FM-1515 THROTTLE NEEDLE 3.75
52660 FM-1516 SPRING, THROTTLE NEEDLE 1.25
52670 FM-1517 BOOT, THROTTLE 2.50
52680 FM-1518 CAP, THROTTLE NEEDLE 2.25
52690 FM-1519/20 BARREL STOP BASE AND NUT 2.25
52629 FM-1521 BARREL STOP SCREW 2.25
52621 FM-1522OFNA .15 LOW END NEEDLE (MODIFIED) 4.75
52630 FM-1523 WASHER, ALUMINUM, 1 PC 0.95
52640 FM-1524 FUEL SUPPLY NIPPLE 2.50
52650 FM-1525 MAIN NEEDLE SEAT 4.25
52670 FM-1527 CRANKSHAFT, 13mm 31.95
52900 FMB-1 BEARING, OUTSIDE, 607Z 5.95
52910 FMB-2 BEARING INSIDE, 6901 8.50
52920 FMB-3 BEARING INSIDE, 13mm 18.95
52930 FML-1 SEAL, REAR COVER 1.75
52940 FML-2 SEAL, CARBURETOR 1.25
52950 FML-3 SEAL, LOW END NEEDLE 0.95
52950 FML-3-1 SEAL, LOW END NEEDLE, SUPER 0.95
52960 FML-4 SEAL, MAIN NEEDLE 0.95
52970 FMP-1 PIN, PISTON 2.25
52980 FMS-1/2/4 SCREW SET 2.50
52990 FMW-1 CLIPS, “G”, 2 PCS. 1.25
OFNA RACING , 22692 GRANITE WAY, STE. B, LAGUNA HILLS, CA. 92653 (949) 586-2910
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