ZEN 515 fitting


ZEN515 carb

The enclosed spring goes over the cable between the cable stop and the brass bellcrank fitting. The screw on the side with the spring on it is the main needle.  Midrange is the tiny screw down inside the top of the barrel. The midrange is not critical and it will throttle well without fine tuning and the main needle is also not critical but must be adjusted for best performance. Start with the main needle 4 turns open and close from there with on water testing to determine best setting. Confirm the needle is not set too lean by ‘plug chops’.

       Start the engine on half throttle until best needle settings are found.

   The pressure tapping can be fitted anywhere in the crankcase or as shown below in the insulator block. The nipple must be at the bottom of the insulator block.
















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