Here's a puzzler. I have a newly rebuilt C-85 with the Stromberg NAS-3A1 carburetor. The engine starts immediately and idles perfectly, but it runs extremely rough beginning at about 1100 rpm. If we continuously shoot fuel into the engine by using the primer, the engine smoothes out and the rpm picks up. We are able to maintain smooth rpm in the plus-2000 range using this method. Mag timing is good and the mag points are new, as are the spark plugs. Carb heat has no effect on the roughness; neither does the mixture control.
Here's what my mechanic and I have done thus far: Removed, disassembled and thoroughly cleaned the carburetor, and reassembled it using new gaskets, seals, etc. Checked the float level Checked the tightness of all the intake hoses, and checked for a cracked or warped intake spider Cleaned the fuel lines and refilled the tanks with fresh 100LL avgas Checked engine compression (80/80 on all cylinders) It should be noted that before the engine rebuild, I never experienced any problems with rough running, at any speed. Any ideas??? Thanks! Bill T. N3688H __________________________________________________________________________ ______ To unsubscribe from this list please send mailto:[EMAIL PROTECTED] ___________________________________________________________ T O P I C A The Email You Want. http://www.topica.com/t/16 Newsletters, Tips and Discussions on Your Favorite Topics
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