1978 Mazda RX7 with a nikki carbed 12app

My mazda Rx7, has a 12a peripheral port motor, with a modified nikki carb (the carb it originally come with) It still needs a bit of tuning, its a little bit lean at idle and on the primary circuit, so Ill get that sorted in the next few days, got a bit more power than the motor when it was just extend ported! I will eventually put an IDA on it but will run it like this first at the drags and see what we can get out of it!

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rx7 nikki problems help?
this is my nikki problems, i know the secondaries dont open on a stand still but i know they do open for sure. i never touched timing and the wires go correct. my clutch is fine and compression is good enough





1980 RX7 project (Part 2)
Watch in 1080HD. Part 2. (OEM Intake and Carb removal) Replacing this week with a Racing Beat 12a intake and Holley 600cfm 1850-3 carb (manual choke) ----------------- 1980 Mazda RX7 project car. Thanks for watching and please subscribe to see this cars progression. Watch in 1080HD. ----------------- Part 1: http://www.youtube.com/watch?v=5PzhJErL7lE ----------------- Ideas are welcomed. Cheers, Joe





1980 Mazda Rx7 12a Nikki 4bbl mechanical secondaries modification.
I first would like to say I screwed up on the oil metering pump arm by cutting it off and ended up having to weld it back so that it would work with throttle movement.





Rx7 4 Barrel Nikki Carb Float/Aux Slow Circuit Fix ??
Fixing the float circuit / auxiliary slow circuit. The following is from Bill Carroll's Mazda Rotary Engine Manual, pg. 42 & 43. "b. Float Circuit The float chamber is equipped with a float and a needle valve to keep fuel level constant under all operating conditions. Especially, as a needle valve material the special rubber is adopted more to prevent the fuel from over-flowing. An oil level gauge (sight glass) is provided in the float chamber for easy inspection of fuel level. The ventilation system of the float chamber is of inner circulation type. Thus the fuel consumption is not influenced even if the air cleaner is clogged to a certain extent." "d. Auxiliary Slow Circuit This circuit has been installed to prevent misfiring and knocking which are liable to occur at low load and high revolution due to lean mixture. This is of the structure that a diaphragm responsive to the negative pressure of the secondary side is provided halfway on the circuit with its valve designed to open at a certain extent of the negative pressure, allowing the fuel fed from the secondary step system to pass and proceed to the auxiliary slow jet and then finally the fuel is ejected through the auxiliary slow port to the primary venturi." http://www.youtube.com/edit?o=U&video_id=nrnoJMEWi_I




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