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X-Kart Racer · Joined: 06 Oct 2004 Posts: 8 Location: Swainsboro GA

I have a 1980 NA 924 with dual Dell Orta carbs. I've had the car for about a year now and I'm finally starting to sort the engine out. The car sat for 5 yrs in a barn. When I first got it I cleaned the fuel tank and replaced the fuel lines and fired it up, but it ran really rough. Recently I have replaced the plugs, plug wires, disb cap and rotor. Today I fired it up again and I have found that cylinders 3 and 4 are not firing. My engine experience has mostly been with small engines due to my past hobby of kart racing.

So where do I start to sort out the issue with cylinders 3 and 4? (New disb?)

Thanks in advance for any help.

jpab924 · Posted: Sat Nov 05, 2005 1:05 pm Post subject:

Spark, compression, and fuel.

If you have spark and compression, more than likely the jets in the aft carb are plugged.

X-Kart Racer · Joined: 06 Oct 2004 Posts: 8 Location: Swainsboro GA

Forgot to mention that I also have pulled the carbs and cleaned them. I'm going to check for spark on cylinders 3 and 4. Again, the engine cranks and runs, but when plug 3 and 4 are pulled there is no difference in the way the engine runs. So I guess you could say that I'm running a 2 cylinder engine (sounds like a John Deere 430).

My924gtc · Joined: 14 Aug 2004 Posts: 1362 Location: 248

Is there unburnt fuel in the cylinders? If so, ignition problem.

If not, since you are running carbs, I would say that because you are experiencing problems with these two cylinders, and they operate off the one carb, I would suspect that carb is causing a problem with fuel delivery. Keep in mind that cleaning is not quite the same as rebuilding.

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MJ
'81 924 2.0L T
'82 924 2.3L SC/EFI <---online fall '06

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