I have a 10hp tecumseh engine turning a 5kw generator. It ran fine then sat for a year with no stabil. Cleaned carb and tried to start but could get it to run only after pouring gas in the cylinder. Ordered new carb off ebay and installed with adjustments as recommended. Still could only get running after pouring gas into cylinder. Put genset under load and it backfires and shoots flame from muffler. Checked flywheel key and valves, all looks okay. Is it a bad deal on a new carb or what? I'm ready to throw it away!

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