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Recently purchased a 1979 Rx-7 GS, the carburetor almost definitely needs rebuilt. Unfortunately, after perusing this forum and looking at rebuilding the carburetor, I have realized I most likely do not have a carburetor from any of the 79 to 85 year models. This scares me because, in spite of many guides on how to rebuild a stock Nikki carb, this doesn't seem to be a stock Nikki.
well, it does say nikki on the side of the bowl. by the looks of it, it's a 79 or earlier carb. i would think that any of the nikki rebuild kits will work.
So your carburetor looks like the castings are similar to my 1979 Nikki, but there is no idle mixture screw, so I am guessing it may be for California's emissions? The carburetor in your pictures looks like it may have been stripped down a bit as well, it looks nice and simple. I think the rebuild kit for a 1979 Nikki would have most of the parts you need.
I rebuilt mine using the guide provided by jeff20b and I couldn't be happier with the results.
Good luck.
Did the carb come on your car when you purchased it or did you buy it on eBay. Your first post and last post make it hard to understand. Anyway, it's a stripped down rotary carb. Your rats nest is missing also so having a stripped down carb make sense.
Man, the different air horn on the 81-85 carbs really threw me through a loop. The spot on the carb that normally has all the identification info isn't on mine, which doesn't help either.
It definitely does seem to be a 79 or 80 carb. What are the odds of that?
Previous owner here, I swung by today to check the car out. Here's a bit of backstory on the carb issue. When I got the car, the carb had been stripped down and was missing a lot of pieces. The engine wouldn't even start on it, so I decided I was going to build my own twin-SU intake manifold for it (mostly because I had some SUs and I'm cheap). In the meantime, to make it run and saleable, I bought the random carb that Ta-Aikah posted pictures of earlier off of eBay. I'm not sure what model it came from and even the eBay ad wasn't sure. It came with an intake manifold, but the ports didn't line up with the 12A irons in the car at all, so I used the intake manifold and spacer that was originally on the car and slid the mystery carb on top. It ran, but poorly.
You have to really pump the throttle maybe 20 times before cranking the engine to get enough fuel into it to start and it sounds like an old man waking up from nap as it slowly fires up. Once running, it won't idle below about 1,200 RPM at all.
So, today I swung by to give my SU science project another stab since the only thing it would cost to try is an early morning drive in my Bellett (and it was fantastic). Here it is on the engine:
A few things to note here, it's obviously a work in progress and made by an unskilled nerd in the middle of Texas out of scrap metal. However, the engine cranks right up after about 3 turns, exactly how it's supposed to. Unfortunately, there are so many pinhole leaks from my embarrassingly bad welding that the engine pulls in so much air it starts to rev up uncontrollably high. What this tells me is that while this manifold may not be a viable option (even though I haven't given up on it), there is something fundamentally wrong with the carb that's on it. If the engine can start easier than it ever has with a ghetto-fabulous intake manifold and 240Z SU carbs, then the problem isn't the engine itself, ignition, etc.
While we were doing this though, I looked at the underside of the carb and the intake manifold and noticed some things that make curious. The one that I'm most worried about is the cutout between primaries and secondaries.
As you can see, the carb has a cutout between the primaries, but the intake manifold has cutouts between the primary and secondary runners and no cutout between the primaries. My rotary intake pulse knowledge is nowhere the level it should be, but this just seems... not right. So, looking at the carb and intake manifold, what do you guys think?
06-22-18, 06:43 PM
Help Identifying What Carburetor I've Got
