| [Manufacturer] | Arrow Shark |
| [Brief Description] | The Pro-Mod M-39 barrel-type carburetor is Arrow Shark's latest product release in our never-ending quest for improved RC boat performance. The M-39 is similar to the highly regarded WYK-33 carb but we have improved it further by using a center barrel made from aluminum, rather than plastic, for better durability. We have retained all the enhancements we introduced with our Pro-Mod WYK-33 so the M-39 has features such as both the carburetor body and the barrel having been CNC-machined to be 15.85mm in diameter and with a CNC radius-entry which increases the airflow by 30% or more. We have reset the pop-off pressure for the incoming gas, and a straight nipple has been installed for connection with your engine crankcase to provide the pressure pulses for pumping gas from your tank. Finally, we have installed a 90 degree fuel nipple on the carby for easier connection to your gas tank.
#1: Low-Speed Needle: The low speed needle of the M-39 carburetor is hidden in the center of the carburetor barrel. You need to use a small precision flat blade screwdriver to adjust it. When adjusting the Low-Speed Needle, you need to apply Loctite#222 on the needle thread in order to hold the needle in position during engine operation. The Low-Speed Needle is set at 6-61/2 turns out from fully closed. Note: When the M-39 carb is installed rotated in your boat, it is not easy to adjust the low speed needle. We do pre-set the needle at its 6 turns open setting at our factory, so it's unlikely that you will need to change it. However, if you do, you will first need to either remove your engine from the boat or at least uninstall the carb from the engine. After extensive testing on our Pro-Mod M-39 carb, we have found that the 6 turns open setting works well on both stock and modified engines. #2: High-Speed Needle: The High-Speed Needle is set approximately 2 plus 1/2 turns open from fully closed. #3: Idle Screw: Please take out the idle needle from the carb after you set up the idle speed for your engine. |
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