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#1
05-18-2011, 03:50 PM
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1650 carb rebuild complete and tested
Well I finished the carb rebuild a few days ago. Today we finally had good weather. Took me about 10 minutes to put the carb back on, reconnect the spark plug wire and battery cable. She didn't want to start first..probably took some time to get the old gas to start flowing.
My Kohler manual says to lightly bottom the idle and main fuel screw. The manual said to turn the main twice. The idle fuel, 1 and 1/4. Bu the carb rebuild article stated to turn the main 2 and 1/4. So I opted to stick with the manual first. Running a little fast so I readjusted it a quarter more turn open. Sounded a lot better. She sounded to run a bit smoother. I did not make any further adjustments. I went along with the carb rebuild article and my manual. I drove her around at various throttle arrangements. It was running pretty good but it DID start to sputter a few times again at half throttle.  But not as bad. She started to knock a little and pushed the throttle back full and it started to run better again. I turned her off and she stopped hard with one back fire. I started and shut down a few times. Did not back fire again. I think I need to readjust the throttle idle screw. Overall she is running better and smoother. But still sputtered a few times. I mowed two lawns with it afterwards. No problems at all. To rate it I'd give it a 8 out of 10 of working better. My first carb rebuild. So what does everyone think? feedback?  Thanks, Nate 
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#2
05-18-2011, 06:48 PM
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Try turning the idle speed screw (not to be confused with the idle fuel mixture screw) down to where you can practically count each rotation of the motor. If the motor dies idling that low, the idle mixture screw needs to be adjusted. The motor should be able to run fine at very low rpm's, that's how you determine if the idle mixture screw is set properly.
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