Backfire
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4th Gear
Joined: Mar 2007
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Backfire
2005 Dyna 9000kms. Stage 1, carb.
I am starting to get a backfire out of exhaust on startup .. It will backfire when cold and fuel enricher is out. It will also backfire when engine is warm and the enricher is pushed in The bike runs nice and smooth when it is up and running. I have noticed the exhaust smells snd sets off my CO2 alarm in my garage. I am wondering if it is running a little rich and how to adjust the fuel/air mixture screw. eg.. how many turns from the seat postion.
I am starting to get a backfire out of exhaust on startup .. It will backfire when cold and fuel enricher is out. It will also backfire when engine is warm and the enricher is pushed in The bike runs nice and smooth when it is up and running. I have noticed the exhaust smells snd sets off my CO2 alarm in my garage. I am wondering if it is running a little rich and how to adjust the fuel/air mixture screw. eg.. how many turns from the seat postion.
Supporter
Joined: Jan 2007
Posts: 15,788
Likes: 5,639
From: along the shore of Mishigami
If you have an aftermarket exhaust and stage 1 intake, turn the air mixture screw 2 1/2 turns from lightly seated. Don't roll the throttle before you start, that pumps extra gas in the cylinders before it starts.
Road Warrior
Joined: May 2008
Posts: 1,955
Likes: 6
From: Little Rock
and can also blow a head gasket
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