Excessive air cleaner oil on 02 pit-107

[pitbull pat]

Thinking I have excessive oil coming out of air cleaner. S&S recommended I vent the lower end. I did this on my 68 shovel...has anyone did this on a BD and if so do I use the plug below the oil pump? I know there was also an issue with bad heads from S&S due to oil hole being machined to close to another...which the recall replaced...anyone up on this???

Thanks to all who helped moved the ball forward on this project!!

 

[knothead]

107 u have should already have a vent hose....check to see if its clod up...Do u have the right oil filter on it?...2 different types of oil filter make sure urs doesnt have the rubber flap in the filter...u can see it looking thru the holes of ur filter...if its has the rubber flap its wrong its for a twin cam and this will make excessive oil come fron ur breather...another thing is possibly ur vent off ur heads going to the air cleaner maybe stopped up also....3 different things there to look at

 

[woodbutcher]

oil filter for these motors should be #170 (C for chrome, B for black). if you have the one for the twin cam, it will be #171. oil out the intake/carb could be as simple as being over-filled.

 

[awg]

And there you go!

 

[john sachs]

I recommend and do on any BIG DOG heads to:
Block off the vacuum from the small fitting on the front head to the intake manifold.
Vent the rear head with the black and white 1 way valve to the street. (Remove from back of air cleaner).
Remove 1 of the taper plugs from the back of the CASE ( there are 2. 1 is at 90 degrees, the other is at 45 degrees) your choice as which one you want to remove.
Install a hose barb in the 1 you removed the plug from. Install a piece of hose and a 1 way valve on the barb, and vent to the street.
This will solve your oil problem.
S&S 1 way valve part # 50-8122 check valve.
John

 

[SB03chopper]

Listen to what John has to say, that is the way the older (03's and back)engines from S&S were made.

 

[Patrick]

Got it..i will apply the recommendations provided...i bought bike from original owner w 5000 miles. There is no vacume from Carb going anywhere ando see no lower crankcase vent w breather...but will install. I see the plugs
For one... my oil tank has NO dipstick or
Fill line (horseshoe) so where is best level?

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[pitbull pat]

I have no vacume lines coming from front head and both carb vacume ports are capped. I do have one crankcase line running from the back of the crankcase to the super G backplate...so basically I should remove the crankcase line from carb and install one way valve to the street on that line. I should also put one way valve in rear head and run to street don't I need vacume somewhere or no? Lastly, where are the plugs located on the head? (02 pitbull)

 

[john sachs]

I have no vacume lines coming from front head and both carb vacume ports are capped. I do have one crankcase line running from the back of the crankcase to the super G backplate...so basically I should remove the crankcase line from carb and install one way valve to the street on that line. I should also put one way valve in rear head and run to street don't I need vacume somewhere or no? Lastly, where are the plugs located on the head? (02 pitbull)

Remove the breather line from the air cleaner, and vent it to the street with the S&S 50-8122 valve or a PCV valve. My above post applies to 4 1/8" bore engines.
If you can, post a picture of the carb side of the engine.

 

[Patrick]

Here is carb side and capped vacume
Ports

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[john sachs]

The vent line from the rear of the case needs to be aimed down toward the ground. The head breathers need to be connected to a T fitting, and also aimed down toward the ground. This should solve your problem. Also, DON'T use a foam filter in the air cleaner. Don't oil the filter you use in the air cleaner. Reversion will take care of that.
What cam is in the engine ? Compression seems a little low. Hold the throttle wide open, and crank the engine until the needle stops moving.
John

 

[Patrick]

What do you do w front head line to carb? I did bottom part like you said n ran line to oil catch can that used to go to air cleaner. Now I'm still getting lots of oil out cleaner and will do your top venting but just wondering about front cylinder to carb hose. Do I block off rear cylinder hole n
Leave in place?

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[pitbull pat]

The vent line from the rear of the case needs to be aimed down toward the ground. The head breathers need to be connected to a T fitting, and also aimed down toward the ground. This should solve your problem. Also, DON'T use a foam filter in the air cleaner. Don't oil the filter you use in the air cleaner. Reversion will take care of that.
What cam is in the engine ? Compression seems a little low. Hold the throttle wide open, and crank the engine until the needle stops moving.
John

compression is 180 after second longer roll over. is it mandatory that i use a one way valve on top t-fitting line? ran bottom line from crankcase to new oil catch can ...wondring if i can tie into that line so all ventilation is through catch can

 

[pitbull pat]

compression is 180 after second longer roll over. is it mandatory that i use a one way valve on top t-fitting line? ran bottom line from crankcase to new oil catch can ...wondring if i can tie into that line so all ventilation is through catch can

not sure which cam i have but is stock s&S 107...2002

 

[john sachs]

When you're doing a compression test, crank the engine until the gauge won't go any higher.
If you're breathing from the rear of the engine case, you can block the hose off from the front head to carb.
John

 

[pitbull pat]

That's how I did test this time and was 180 on both cyl.
As for venting im am running crankcase to oil catch can and vented top w filter n one way.

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[Jersey Big Mike]

The vent line from the rear of the case needs to be aimed down toward the ground. The head breathers need to be connected to a T fitting, and also aimed down toward the ground. This should solve your problem. Also, DON'T use a foam filter in the air cleaner. Don't oil the filter you use in the air cleaner. Reversion will take care of that.
What cam is in the engine ? Compression seems a little low. Hold the throttle wide open, and crank the engine until the needle stops moving.
John

Ok, what should the compression be on a stock 117 from Big Dog
My math say that's in the right range 10.2 compression so 10.2 x 14.7psi (normal air pressure) gets me 150 or so by the numbers -- Am I missing something?

 

[john sachs]

Ok, what should the compression be on a stock 117 from Big Dog
My math say that's in the right range 10.2 compression so 10.2 x 14.7psi (normal air pressure) gets me 150 or so by the numbers -- Am I missing something?

I've never checked cranking compression on a stock cam B.D. 117" I've probably done somewhere in the area of 50 + sets of 117" and 124" S&S EPA heads. They never leave here set up for the stock cams, springs, deck height (I shorten the cylinders, or spin drop the heads), compression or stock valve sizes and guides. My combinations are what it takes to optimize engine performance without any PMS, taking into consideration where the engine is used (sea level or ?)
John

 

[Jersey Big Mike]

I've never checked cranking compression on a stock cam B.D. 117" I've probably done somewhere in the area of 50 + sets of 117" and 124" S&S EPA heads. They never leave here set up for the stock cams, springs, deck height (I shorten the cylinders, or spin drop the heads), compression or stock valve sizes and guides. My combinations are what it takes to optimize engine performance without any PMS, taking into consideration where the engine is used (sea level or ?)
John

Well if I had the money and wanted performance engine, we'd be talking about, but stock does me just fine -- I cruise leisurely along. I asked since I know your reputation for engine work. I've rebuilt car engines but even back in the day I was never building performance engines -- stock only.
And I may need to check my compression although I have a few things to double check first -- front cylinder was giving me issues today at the end of my run, but first thing to do is check all the things I just did and replaced. Then I'll look for bigger things. Process of elimination!

 

[john sachs]

Well if I had the money and wanted performance engine, we'd be talking about, but stock does me just fine -- I cruise leisurely along. I asked since I know your reputation for engine work. I've rebuilt car engines but even back in the day I was never building performance engines -- stock only.
And I may need to check my compression although I have a few things to double check first -- front cylinder was giving me issues today at the end of my run, but first thing to do is check all the things I just did and replaced. Then I'll look for bigger things. Process of elimination!

You can call me, and I'll try to help. Message me for my phone #.