FunK73

iTrader: (6)

So I'm having a hell of a time figuring out why my car is never running right. As of now I have a stock nikki (rebuilt 3k miles ago) on my car with the rats nest removed. Now I'm having an issue of power loss. If I ease into the gas when the rpms hit 1000-1200 i hit a huge power loss and the car will actually die. However if I punch the gas, it seems to power through it.

At first I thought for sure it was timing. I'm running the vac line off the front most nipple on the base of the carb and its split in a t fitting to the dizzy. However it seems that no matter where I set the timing, the power loss is always there.

Any ideas?

Oneiros

Sounds like timing, but it could also be your accelerator pump not being adjusted correctly, especially if it's a fresh rebuild. If the nut is not in the right place, the AP won't start shooting fuel until too late, so that there is a stumble when you initially open the throttle.

The way to test it is remove the air cleaner, and look down the barrels at the AP nozzles while opening the throttle by hand. You want to see a slight bit of fuel coming out of them as soon as you open the throttle. If this is not the case, back the adjustment nut out little by little until this happens.

I'll get some pics if you need them but if you rebuild it yourself I'm assuming you know the parts I'm talking about. Hope that fixes it.


Edit: You may also find that where the AP arm joins the lever on the throttle shaft has worn down, creating too much play between the two, I find this on almost every carb I rebuild and have to repair them with metal work solder.

FunK73

iTrader: (6)

well this carb is from a 1981 car, and its on my 84. Ran fine on that car and was rebuilt but the owner of RX7 Heaven up here. So hopefully its all figured out. As far as timing goes, and ideas there? No matter how its timed the issue never goes away

Rx-7Doctor

iTrader: (13)

http://sterlingmetalworks.com/the_nikki_carburetor.htm

FunK73

iTrader: (6)

I didnt see anything about power loss there like what im having happen, its all high end power loss which I am not having

Dan_s_young

iTrader: (1)

Now this is a complete guess and stab at this, but check and make sure you have spark on the leading and trailing plugs. I had similar symptoms before when one of my ignitors failed.