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Ingemar
| Posted on Monday, November 08, 2004 - 01:58 pm: |
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I believe what causes exhaust popping is a rich condition. The reason why I believe that is because the pop you hear is unburned fuel burning up in the exhaust. If the engine is running lean, there is no fuel left to be burned. The debate is open. But please keep it friendly. Crossfires of (personal) attacks really spoils the fun of a good debate IMO. |
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Stealthxb
| Posted on Monday, November 08, 2004 - 02:04 pm: |
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It's just the bike pouting! Mine gets upset when I roll off the throttle. |
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Lazyme21
| Posted on Monday, November 08, 2004 - 02:58 pm: |
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mine gets upset when I roll off the throttle also. Does this come down to a timing issue? |
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Rr_eater
| Posted on Monday, November 08, 2004 - 03:18 pm: |
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Just a thought, why dont vehicles with restrictive, stock, quiet exhausts, pop as bad? I am going out on an slightly educated limb here(read: in my experiences), that there is something to do with the instantaneous introduction of cooler air on the reversion side of the exhaust cycle during engine deceleration (due to a vacuum in the exhaust). Not all the way to the valve, only into the exhaust, causing what is known as a lean-misfire condition. Substantiation: My performance exhaust in my mildly warmed VW Jetta USED to pop quite a bit on deceleration, when the fuel system was set to stock settings, and a leaking-at-the-joints exhaust system. Riched up the fuel system overall, and popping lessened, but still there. Had exhaust shop weld up all the slip joints to my mandrel bent system, and holly cow, it almost never pops now, just winds down under spirited driving conditions. To my last Buell (2000 M2) Installed V&H slip on, lots of popping. reworked factory carb and settings, less popping. Made a custom silicone sealing sleeve for the pipe joint, even less popping. Replaced header gaskets, almost never popped after that, just winds down, even during HARD riding excersises. Just something to contemplate guys Bruce |
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Tripper
| Posted on Monday, November 08, 2004 - 03:22 pm: |
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You need fresh air in there to mix with the unburned fuel. Suspect a leak around your exhaust gaskets. |
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Ingemar
| Posted on Monday, November 08, 2004 - 03:33 pm: |
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I needed this an hour ago. We are all right
quote:5. I have a popping out of my exhaust when I let off the gas. *Watch Video Answer* We take a fare amount of tech calls related to popping. However, to have an explosion in your pipe you need to have 3 things: fuel, spark, and air. Most of the time your pipe has a supply of fuel. It also, has a spark source. The one thing it does not have is much air. On metric cruiser or sport bikes the air gets in, from the air by pass systems. Many think of it as a bad thing and remove them. The most common problem of popping on these bikes is because the air by pass hoses are not pluged in properly. Harleys have a little different problem. The air needed for the explosion usually gets in from the exhausts. You will find that holding a Kleenex next to the baffle in back, during idle, causes the Kleenex to be drawn into the pipe. This is the main source of the air needed for popping. This is even more common with baggers, which have a dummy pipe on the right side. Fuel of course helps, but it is better to find ways to cut down on the air.
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Slaughter
| Posted on Monday, November 08, 2004 - 07:52 pm: |
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I was going to second the one about leaking exhaust - gasket going bad, loosening clamp or busted stud. I broke a stud - was really obvious when it started popping when I rolled off the throttle. |
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Glitch
| Posted on Monday, November 08, 2004 - 08:04 pm: |
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You can pop like mad if your timings off as well. |
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Robxb
| Posted on Monday, November 08, 2004 - 08:31 pm: |
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Is the popping going to damage any thing though ??? My xb12 does it a little, but my road king does it a lot. And yes I read the part about the dummy pipe. Will a true dual system help it ? |
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