2000 Dyna intake leak mystery?
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Novice
Joined: Aug 2019
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From: El Paso TX
2000 Dyna intake leak mystery?
I've got a 2000 dyna super glide that has continuously had an intake leak. It had a CV carb on it at one point and had a really bad intake leak. It would pop and spit pretty bad. So I had that carb taken off and had a brand new S&S super E installed. Now I've ridden the bike quite a bit since the carb was installed at least 400 miles. And once during the ride normally after it warms up it will kind of spit back in the carb. Now keep in mind it isn't doing this a lot normally one time a ride and I ride 50+ miles each time. So when I got back home I used the old gray bread trick of spraying carb cleaner around the intake to check for a leak. It shut off the bike. Now someone pointed out that the overspray could be getting sucked up by the air cleaner and that I should use an unlit butane torch. That's how I was taught to check. What do you guys think? Is this an intake leak or is there a better test. What is my next course of action?
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Joined: Jul 2008
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From: southeast PA
If you go by the factory service manual they use the propane method. Of course they sell the tool to do that for too much money. You can use any propane torch (unlit) and see if you get the same results. With the propane it's easier to pinpoint where the tip is pointed, as opposed to a spray can which has a wide pattern. You still have to be careful not to spray into the intake.
Have you ever checked the intake gaskets or checked the manifold flanges to make sure they are flat with no distortions? A thick piece of glass is good for that.
Have you ever checked the intake gaskets or checked the manifold flanges to make sure they are flat with no distortions? A thick piece of glass is good for that.
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Novice
Joined: Aug 2019
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From: El Paso TX
I have never checked the flanges against a flat surface and I havent checked the seals since the new carb was installed. I will buy a butane torch and try to track down which side is taking in air. I'll try to keep you guys updated on the progress. Anyone have a fool proof method for seating those seals?
Extreme HDF Member
Joined: Aug 2013
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From: Somewhere SW
I've got a 2000 dyna super glide that has continuously had an intake leak. It had a CV carb on it at one point and had a really bad intake leak. It would pop and spit pretty bad. So I had that carb taken off and had a brand new S&S super E installed. Now I've ridden the bike quite a bit since the carb was installed at least 400 miles. And once during the ride normally after it warms up it will kind of spit back in the carb. Now keep in mind it isn't doing this a lot normally one time a ride and I ride 50+ miles each time. So when I got back home I used the old gray bread trick of spraying carb cleaner around the intake to check for a leak. It shut off the bike. Now someone pointed out that the overspray could be getting sucked up by the air cleaner and that I should use an unlit butane torch. That's how I was taught to check. What do you guys think? Is this an intake leak or is there a better test. What is my next course of action?
BTW I have fuel injection and ocassionaly it will spit back through the intake... typical Harley.
Extreme HDF Member
Joined: Aug 2013
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From: Somewhere SW
When you spray, you spray. It forms a wide pattern that can be drawn into the air cleaner giving you false results.
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Novice
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From: El Paso TX
Well I haven't ran the butane torch test yet so... I'll do it to be sure. Yeah harleys have their ticks. Id rather be overly cautious than be right and do nothing about it. Even if I speculate and I'm wrong it was worth being proactive.
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Novice
Joined: Aug 2019
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From: El Paso TX
I realized the fault of the spray test and that's why I asked around for a more specific method. I've never heard of anyone using a butane torch but once they explained it that made perfect sense. I was looking for a more precise method to diagnose something I suspected.
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