Didn't you just add some pipes are mufflers? Maybe it's okay, just running lean. Has anyone jetted the carb? What number low speed jet do you have? A 42 is too small for stage one use (high flow air cleaner and pipes). I figure you may have seen the number, or already know what it is.
Actually, check for this first. You might have a vacuum leak. Has anyone ever replaced intake seals? They may have become cracked if they're old, then the mainfiold got jostled when ya removed the carb. The bolts also may have come loose.
To check for leaks, engine running, you can spray the area where the manifold meets the head with carb cleaner. Another spot to watch... where the carb meets the mainfold...I've folded this gasket over a couple times puttin the carb back on.
Becareful spraying carb cleaner/ engine running; watch what you are doin. Justa little...you'll hear a rise in engine rpm when ya find the area of the leak. Sounds simple, sometimes it's not, cuz it'll also raise the rpm if it gets sucked up thru the air cleaner.
Take care, let us know what you find.  | 
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