Operation instruction for OFNA engine, this engine is extremely tight when the piston is at the top of the stroke, 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 compression 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. After engine is cool, start engine up again and repeat the cycling 3 times. BREAK-IN NEEDLE SETTINGS & NORMAL NEEDLE SETTING • MASTER NEEDLE - 5 TURNS OUT • MASTER NEEDLE - 4 TURNS OUT • LOW-END(BLK) NEEDLE - 3.5 TURNS OUT FROM FLUSH • LOW-END(BLK) NEEDLE -3 TURNS FROM FLUSH • MID/LOW-END(BRASS) NEEDLE - FLUSH • MID/LOW-END(BRASS) NEEDLE - NO TURNS. Side Black Carburetor Needle (Low End) - This needle is in the center side of the carburetor barrel and provide throttle response. It is not the idle adjustment. Set 3 to 3.5 turns out from FLUSH with the black ball 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.
Tags : new abc, throttle response, piston, top speed, aluminum, stroke
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