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Hey all, i recently purchased my first rotary powered vehicle a 1979 rx7 racecar basically the whole works. It raced in icscc back in the late 90s, not exactly sure how long its sat. it is pretty modified, the nikki carb has been pretty stripped, ive done some reading and found this is pretty common, theres no choke etc...the issue i am having is the car not being able to idle at all, it starts up fine, revs with no studders or hesitations but drops to 500 and dies all within a second or two. Im not ruling out fuel pumps/filters or a vacuum leak but could the carb be modified to not idle for racing purposes? I went ahead and ordered a kit from Atkins and rebuilt the nikki to no avail...Like i said i am entirely new to this and trying to learn as much as fast as i can. Ill put some pictures of my carb.
You have a hogged out 79 Nikki in your possession. Congrats! Me too! Yours looks like a Dave ******* like mine. As such, it is not tuned right and will require some reworking of the air bleeds and then the fuel jets, but more on that later.
The get it to idle, you will need to turn the small middle fuel mixture screw out a little, and turn up the throttle stop screw to idle it up until the engine warms up enough that it will idle on its own. Then you can fine tune the idle until it runs best.
I've written veritable tomes on the subject of modded Nikkis, mostly hogged out and boost prepped, but it can be applied to NA setups such as yours. Please search out my writings.
Oh and in case you haven't seen this yet, you should never change out the needles and seats. That carb you have there probably has the heavy clunky RX-3 floats and Grose jets, which are glass ***** that act like needles and seats and were the only solution other with these improperly tuned hogged out Nikkis came up with because they didn't know how to tune worth a darn.
On second thought, yours is not a Dave *******. Please look up my "Racing Nikki" to see what I'm talking about. I wonder if I should post pics of the revamped Racing Nikki now slated to go on a half BP 12A... I'll do that later.
You have a hogged out 79 Nikki in your possession. Congrats! Me too! Yours looks like a Dave ******* like mine. As such, it is not tuned right and will require some reworking of the air bleeds and then the fuel jets, but more on that later.
The get it to idle, you will need to turn the small middle fuel mixture screw out a little, and turn up the throttle stop screw to idle it up until the engine warms up enough that it will idle on its own. Then you can fine tune the idle until it runs best.
I've written veritable tomes on the subject of modded Nikkis, mostly hogged out and boost prepped, but it can be applied to NA setups such as yours. Please search out my writings.
Oh and in case you haven't seen this yet, you should never change out the needles and seats. That carb you have there probably has the heavy clunky RX-3 floats and Grose jets, which are glass ***** that act like needles and seats and were the only solution other with these improperly tuned hogged out Nikkis came up with because they didn't know how to tune worth a darn.
Good stuff to know! It did have those needle seats with glass *****. I was confused because they were so different then my Haynes manual. Ill give your writings a thorough read tonight
On second thought, yours is not a Dave *******. Please look up my "Racing Nikki" to see what I'm talking about. I wonder if I should post pics of the revamped Racing Nikki now slated to go on a half BP 12A... I'll do that later.
Even though mines not like yours i assume all the other info on the idling issue is still relevant?
06-02-16, 08:56 PM
