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  #1 (permalink)  
Old 06-03-2017, 09:06 AM
STEINBVG's Avatar
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Best manifold gaskets?

Guys, are those genuine James blue manifold to head gaskets with a lip on them better and easier to install without leaks that Harley oem or s&s ones ?
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  #2 (permalink)  
Old 06-03-2017, 01:23 PM
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Reasonable manifold leak test???

Hey guys, I'm under impression that one of my bikes has manifold leak: variable idle, deceleration pops, hanging revs...
Replaced gaskets a few times as scientifically as possible. Usual spray on shit for testing leaks seems to give inconsistent data.

Somewhere I read that if head gasket was replaced and cylinder was torqued down a bit off( without aligning it with the manifold) the perfect geometry of intakes will be off and manifold may never seal...which doesn't make sense to me: the rubber gasket should be able to feel the tiny imperfection, gap???

In any scenario, I,m trying this test the integrity of the installation using vacuum pump from sears ( attached to the VOES nipple) and expansion test plug. Pistons at Tdd, Valves closed(?)
I presume there should be no leak, correct? Or valves allowed to leak slightly?


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VITALY.
SORRY FOR THE UPPER CASE. I AIN'T YELLING. I JUST MAKE TOO MANY TYPOS IN THE LOWER.

113"s&s, Walz softail 2000/2012 prostreet
96"s&s, Daytec dyna/ softail hybrid, 2010 chopper
127"Ultima, Chassis Design rigid 2013 bobber
120"Ultima, Kraft Tech rigid 2014 bobber

Last edited by STEINBVG; 06-03-2017 at 01:27 PM..
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  #3 (permalink)  
Old 06-03-2017, 08:06 PM
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I can't believe that any engine would hold that vacuum for a period of time, especially one that has some miles on it..those valves go through hell..the slightest carbon would leak over a period of time...but you should be able to get a good idea of how healthy everything is..Have you ever used the soap bubbles to check for leaks? blow some nice bubbles until they sit on the manifold
and then tap the starter..It's a lot easier than trying to spray a manifold while the engine is running..............I just thought of something with the bubbles, what if you blew air in the opposite direction, instead off pulling a vacuum, and see if it will blow bubbles instead of suck them in? never tried that.
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Last edited by Shovel52; 06-03-2017 at 08:22 PM..
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  #4 (permalink)  
Old 06-04-2017, 05:32 AM
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Quote:
Originally Posted by Shovel52 View Post
I can't believe that any engine would hold that vacuum for a period of time, especially one that has some miles on it..those valves go through hell..the slightest carbon would leak over a period of time...but you should be able to get a good idea of how healthy everything is..Have you ever used the soap bubbles to check for leaks? blow some nice bubbles until they sit on the manifold
and then tap the starter..It's a lot easier than trying to spray a manifold while the engine is running..............I just thought of something with the bubbles, what if you blew air in the opposite direction, instead off pulling a vacuum, and see if it will blow bubbles instead of suck them in? never tried that.
Yeah, I thought so too. Read somewhere that there's no ideal engine with zero leak down. So it could be loosing vacuum through the leaks.
I,m gonna try using the same setup , pump air in instead and use soapy water on the manifold fflanges to see if there are bubbles.
I hope the new gaskets are better...
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VITALY.
SORRY FOR THE UPPER CASE. I AIN'T YELLING. I JUST MAKE TOO MANY TYPOS IN THE LOWER.

113"s&s, Walz softail 2000/2012 prostreet
96"s&s, Daytec dyna/ softail hybrid, 2010 chopper
127"Ultima, Chassis Design rigid 2013 bobber
120"Ultima, Kraft Tech rigid 2014 bobber
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  #5 (permalink)  
Old 06-04-2017, 08:09 PM
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I have used that technique many times on central ac units or just finding a leak in a tire..It always works..let us know if it does..
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Old 06-12-2017, 04:20 PM
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Air leak through carb?

Hi guys, is an air leak is possible through carb?( old, perhaps needs rebuild) rather than through the manifold to head connection, because I think I installed it very correctly with these excellent James gaskets.
The idle seems ok, but hanging revs...slow return to idle
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VITALY.
SORRY FOR THE UPPER CASE. I AIN'T YELLING. I JUST MAKE TOO MANY TYPOS IN THE LOWER.

113"s&s, Walz softail 2000/2012 prostreet
96"s&s, Daytec dyna/ softail hybrid, 2010 chopper
127"Ultima, Chassis Design rigid 2013 bobber
120"Ultima, Kraft Tech rigid 2014 bobber

Last edited by STEINBVG; 06-12-2017 at 05:01 PM..
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  #7 (permalink)  
Old 06-12-2017, 05:32 PM
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What carb do you have? Are you sure your throttle is snapping shut?
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  #8 (permalink)  
Old 06-12-2017, 06:03 PM
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Quote:
Originally Posted by Shovel52 View Post
What carb do you have? Are you sure your throttle is snapping shut?
Old super G circa 1998 or 2000. I was thinking about that too : sticky cables, weak or dirty spring on butterfly. Or some leak on the carb body? Seals?

I definitely will try to clean it again. I was thinking to rebuild it, but wanted to know if the symptoms could even originate there...or its exclusively manifold problem. I did change those big thin o rings on the intake face of the carb and on the plastic insulator just to be sure.
Another thought:
I have 3 other bikes I could borrow carbs from, just to test if the manifold is ok.
2 R1 and another super G.
Tideous, but at least it might point some direction...
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VITALY.
SORRY FOR THE UPPER CASE. I AIN'T YELLING. I JUST MAKE TOO MANY TYPOS IN THE LOWER.

113"s&s, Walz softail 2000/2012 prostreet
96"s&s, Daytec dyna/ softail hybrid, 2010 chopper
127"Ultima, Chassis Design rigid 2013 bobber
120"Ultima, Kraft Tech rigid 2014 bobber
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  #9 (permalink)  
Old 06-12-2017, 07:28 PM
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I googled that, and found this forum ...so it seems that a carb can have vacuum leaks all over the place..and a clog can have the same effect as a vacuum leak..swapping out for a test might be your only answer..

Motorcycle Message Board - Motorcycle USA
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Last edited by Shovel52; 06-12-2017 at 07:33 PM..
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  #10 (permalink)  
Old 06-13-2017, 07:10 AM
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Quote:
Originally Posted by Shovel52 View Post
I googled that, and found this forum ...so it seems that a carb can have vacuum leaks all over the place..and a clog can have the same effect as a vacuum leak..swapping out for a test might be your only answer..

Motorcycle Message Board - Motorcycle USA
Interesting read. Thanks. I had speculated some of the things....
I think i will try to swap a carb first, before i commit myself to 70-80 bucks rebuild kit.
Will try this weekend...I doubt i have been installing the manifold badly following all the instructions to the letter.
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VITALY.
SORRY FOR THE UPPER CASE. I AIN'T YELLING. I JUST MAKE TOO MANY TYPOS IN THE LOWER.

113"s&s, Walz softail 2000/2012 prostreet
96"s&s, Daytec dyna/ softail hybrid, 2010 chopper
127"Ultima, Chassis Design rigid 2013 bobber
120"Ultima, Kraft Tech rigid 2014 bobber
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  #11 (permalink)  
Old 07-15-2017, 09:24 PM
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Looks like the misterious vacuum leak is solved...

The answer is - these horrible pipes

So called LAF??? LAUGH??? Never mind they are short and open, the rear is about 8" shorter...
Briefly:
I told my friend that I had ruled out a leak, rebuilt the carb(2000),played with ignition and jetting. He looked at my pipes and said:'Change these, you may as well have none!'
Just for shits and giggles I screwed on the set of my old V&H SHORT SHOTS, turned wrong direction( don,t fit), just to see his point...and voila- good galloping idle and quick return after revving up. No hanging revs...
Today we cut and welded them, routing around my protruding RSD...made them longer, made a bracket, took for a ride. What a difference!
Once I clean and paint them, will post a pick.
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VITALY.
SORRY FOR THE UPPER CASE. I AIN'T YELLING. I JUST MAKE TOO MANY TYPOS IN THE LOWER.

113"s&s, Walz softail 2000/2012 prostreet
96"s&s, Daytec dyna/ softail hybrid, 2010 chopper
127"Ultima, Chassis Design rigid 2013 bobber
120"Ultima, Kraft Tech rigid 2014 bobber
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  #12 (permalink)  
Old 07-16-2017, 07:30 PM
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Amazing, and they have so many bikes running those pipes...makes you wonder if they have the same problem...
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  #13 (permalink)  
Old 07-16-2017, 07:44 PM
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Quote:
Originally Posted by Shovel52 View Post
Amazing, and they have so many bikes running those pipes...makes you wonder if they have the same problem...
Yep, I wonder too.
In any scenario my friend and I welded the old V&H to fit the bike.
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VITALY.
SORRY FOR THE UPPER CASE. I AIN'T YELLING. I JUST MAKE TOO MANY TYPOS IN THE LOWER.

113"s&s, Walz softail 2000/2012 prostreet
96"s&s, Daytec dyna/ softail hybrid, 2010 chopper
127"Ultima, Chassis Design rigid 2013 bobber
120"Ultima, Kraft Tech rigid 2014 bobber
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  #14 (permalink)  
Old 07-31-2017, 06:11 PM
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had those pipes years back. similar issues. the deceleration pops seemed to put deer in a running charge!
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  #15 (permalink)  
Old 08-06-2017, 09:34 AM
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Quote:
Originally Posted by STEINBVG View Post
Yep, I wonder too.
In any scenario my friend and I welded the old V&H to fit the bike.

Sadly the LAF PIPES are madly popular. I think I can only be the price point. I get guys asking me if they can adapt them to their brand new Harley's. I can make them fit but why? Too many chopper shows I guess. I have 2-1 Stainless Steel Supertrapp on my FXR 113" and although its not the loudest and when I get on it my buddies all tell me my Mikuni 45 the bike rolls a little black smoke out of the pipe. But If my buddies are all far enough behind me at WOT to give me tuning advice on my bike all is right with the world!
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