Intake popping
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Intermediate
Joined: Feb 2018
Posts: 33
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From: NY
Intake popping
Hey everyone, got a question. Why is my 97 sportster 1200C start popping out of my intake once in a while. Most of the time its after about 30 minutes of riding. It only does it when i stop accelerating. I bought this bike used. It does have a after market staight pipe exhaust. And i dont know if the carb has been messed with. Can anyone give me some easy ways to diagnose why this is happening? Thanks all info is greatly appreciated
Road Captain
Joined: Mar 2009
Posts: 654
Likes: 734
Cure for carb farts: 180 main, 45 pilot, 3 turns out on the idle mixture screw.
Note that if it's never been accessed, the idle mixture screw has a cap covering it. You'll find it on the underside of the carb in the back, near the main outlet. Very carefully drill a 1/8" hole through that cap. Be careful as the drill bit breaks through the cap because it's only about a quarter inch from there to the mixture screw and you don't want to mess it up. Pull back on the drill as soon as it breaks through. Now start a sheet metal screw into that hole, grab it with a pair of pliers, and pull the cap out. Turn the screw clockwise until it lightly seats. Don't crank it down! Now back it off three turns.
Note that if it's never been accessed, the idle mixture screw has a cap covering it. You'll find it on the underside of the carb in the back, near the main outlet. Very carefully drill a 1/8" hole through that cap. Be careful as the drill bit breaks through the cap because it's only about a quarter inch from there to the mixture screw and you don't want to mess it up. Pull back on the drill as soon as it breaks through. Now start a sheet metal screw into that hole, grab it with a pair of pliers, and pull the cap out. Turn the screw clockwise until it lightly seats. Don't crank it down! Now back it off three turns.
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badbs101
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Oct 22, 2009 06:15 PM
