Question about 2006 Harley Davidson XL 1200 L Sporster Low

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Revtech 110 blowing oil out front exhaust and breather

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  • Harley Davidson Master
  • 41,695 Answers

Hi Mbcchops, you need to do a compression test on both cylinders. Good luck and have nice day.

Posted on Jun 27, 2015

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Posted on Jan 02, 2017

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SOURCE: oil blow out the breather

too much oil; bad umbrella valves in rocker covers;

Posted on Mar 23, 2009

Mr BrokRench
  • 1623 Answers

SOURCE: Revtech 110 blowing oil out

Oil coming out of the breather is normal on these engines by the way of design, with basically no way to stop it. There is about 1/2 qt of oil in the bottom end of an engine, as the pistons travel downwards, the air that is under them is being pressurized and is vented out of the engine by a rotary breather valve in the case. The air picks up a small amount of oil from the bottom end as it leaves, then the air/oil mist is vented either into the air cleaner (EPA Regulations) or best if vented to the atmosphere. When it's vented into the air cleaner, some if it recirculates into the engine and out the exhaust, the rest saturates the air filter and then eventually gets blown all over the side of the bike. The best way to vent it, is to route a hose from the breather system down to the frame between the engine and trans, run it under the bike on the right side, point the hose down to the ground and zip tie it in place...Be sure to point the end of the hose down & away from the tire.
If your breather bolts start to leak oil...remove them, and use brake cleaner to completely remove all oil from them, the washers, brackets and threads in the head. Use liquid teflon thread sealant on the bolt threads, and a light film of black rtv on the faces of all the washers and brackets, install everything, let sit for 24 hours, then ride.......if done properly and rtv is CURED, it won't leak...
Also note that most HD's with the oil tank mounted under the seat and are left sitting for a couple months will PUKE oil from the breather, this is due to the gravity....the oil will slowly seep through the oil pump and collect in the bottom of the crankcase and get blown out the breather when the bike is started ...

Good luck...i hope this helps

Posted on Dec 13, 2010

  • 2712 Answers

SOURCE: oil blow out the breather

An overfull oil tank will do it. Even if not overfull just about all harley's will blow oil out the air filter. Unless there is a bunch of oil coming out, it's not a problem What I've found is that the air filter eventually gets saturated and then starts to leak through. The level in the oil tank doesn't seem to matter. If you change the air filter the problem goes away, until the new one gets saturated and then it starts all over again. My plan is to get a K&N air filter, which you can clean yourself and save having to buy a new air filter every 4,000 miles or so.

Posted on Nov 20, 2008

  • 42 Answers

SOURCE: 03 HD dyna wide glide blows oil from breather...

How many miles do you have? You probably need to have your oil pump alligned. They get out of wack and cause over oiling. I believe it caused by not being able to return oil efficiently. An evo tappet block alignment tool is now used to align the TC internal oil pump.

Posted on Aug 14, 2009

wd4ity
  • 4565 Answers

SOURCE: revtech 110 ON custom bike

Your RevTech engine is a copy of an H-D Evolution engine. Just as with the Harley engine, it vents it's crankcase pressure through ports in the heads. There are "umbrella valves" made of rubber in the center section of the rocker box covers. These valves are made of a rubber like material and they will harden with repeated heating and cooling. If they get hard enough, they may not work as well as they should. This system does a fair job of removing the oil mist from the exhausted air but there is still some oil left in it. This oil will accumulate in the breather and drip out. You must clean the inside of the air breather occasionally to prevent this. However, if too much oil is coming out, you may have too much blow by on the rings or your breather gear in the cam chest may not be doing as it should. Harley uses a plastic breather gear and I've seen them break a tooth and stop turning. I don't know if RevTech uses a plastic gear or a metal gear. It depends on how much oil is coming out of the breather as to whether or not you have a problem. There are kits available aftermarket to reroute this vented air pressure outside of the air cleaner.

Good Luck
Steve

Posted on Jun 03, 2011

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1 Answer

On a revtech 110 why is oil blowing out the breather tubes and head?


Hi, Chasity oil leaking from your air cleaner is caused by oil carryover from the engine. For whatever reason, the breather system is not separating enough oil mist and air from the piston downstroke. There are cheap and quick easy fixes and there are more expensive ones. First, make sure your breather hoses are not dry and cracked if they are ok you can start by trying the following:
1. Run your oil level half way between the add and full mark when hot.
2. Run oil breather lines from the head into a TEE fitting below carb/induction module then a single line into a mini filter under the frame.
3. Purchase Arlen Ness Super Sucker.
4. Replace umbrella valves and realign oil pump.
5. Upgrade oil pump and cam plate.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below and for more specific information or questions at no charge please feel free to contact me at xlch@mail.com. Good luck and have a nice day.
Understanding Blow By Several Articles
Leaking oil threw breather
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Oct 16, 2016 | Motorcycles

1 Answer

My motor is blowing oil straight out the exhaust; What is wrong?


check the oil level in the sump
the indications are that the oil ring cannot handle the oil load
possible that the fuel tank has drained into the sump through a faulty float needle and seat

Sep 27, 2015 | Garden

1 Answer

I have a 1998 revtech 110 and timing is all f up..how to set ?????


BRING THE PISTON TO TOP DEAD CENTER AND CHECK FOR MARKS ON THE FLYWHEEL. THEN RESET THE IGNITION, NORMALLY 5 DEGREES BEFORE TDC.

Aug 31, 2012 | 1993 Harley Davidson FXR Super Glide

1 Answer

When you push down the acceleration it dies out. Now it wont turn on , when it is turned on , it hesitates to stay on...We thought it was the fuel pump at first cause it wont start at all , but weve...


Well if you feel there is exhaust being blocked then maybe the catalytic converter is plugged.
Where is the oil blowing out at? Exhaust??? A breather?
If you have oil coming out the exhaust then that could have baked in the cat and plugged it. But that would be the least of your problems as there should not be oil getting in there.
Out a breather or even a seal then it could be a bad PCV. But it still should not blow out much.

Aug 31, 2011 | 1997 Mitsubishi Diamante

2 Answers

Revtech 110 ON custom bike not sportster blowing oil through the carb


Your RevTech engine is a copy of an H-D Evolution engine. Just as with the Harley engine, it vents it's crankcase pressure through ports in the heads. There are "umbrella valves" made of rubber in the center section of the rocker box covers. These valves are made of a rubber like material and they will harden with repeated heating and cooling. If they get hard enough, they may not work as well as they should. This system does a fair job of removing the oil mist from the exhausted air but there is still some oil left in it. This oil will accumulate in the breather and drip out. You must clean the inside of the air breather occasionally to prevent this. However, if too much oil is coming out, you may have too much blow by on the rings or your breather gear in the cam chest may not be doing as it should. Harley uses a plastic breather gear and I've seen them break a tooth and stop turning. I don't know if RevTech uses a plastic gear or a metal gear. It depends on how much oil is coming out of the breather as to whether or not you have a problem. There are kits available aftermarket to reroute this vented air pressure outside of the air cleaner.

Good Luck
Steve

Jun 03, 2011 | Harley Davidson XLH 1000 Sportster...

3 Answers

Revtech 110 blowing oil out the air filter, I sent my bike in for its first service (1000 Miles) and since the service the motor keeps spewing oil out the air filter... oil level reduced as i thought...


Oil coming out of the breather is normal on these engines by the way of design, with basically no way to stop it. There is about 1/2 qt of oil in the bottom end of an engine, as the pistons travel downwards, the air that is under them is being pressurized and is vented out of the engine by a rotary breather valve in the case. The air picks up a small amount of oil from the bottom end as it leaves, then the air/oil mist is vented either into the air cleaner (EPA Regulations) or best if vented to the atmosphere. When it's vented into the air cleaner, some if it recirculates into the engine and out the exhaust, the rest saturates the air filter and then eventually gets blown all over the side of the bike. The best way to vent it, is to route a hose from the breather system down to the frame between the engine and trans, run it under the bike on the right side, point the hose down to the ground and zip tie it in place...Be sure to point the end of the hose down & away from the tire.
If your breather bolts start to leak oil...remove them, and use brake cleaner to completely remove all oil from them, the washers, brackets and threads in the head. Use liquid teflon thread sealant on the bolt threads, and a light film of black rtv on the faces of all the washers and brackets, install everything, let sit for 24 hours, then ride.......if done properly and rtv is CURED, it won't leak...
Also note that most HD's with the oil tank mounted under the seat and are left sitting for a couple months will PUKE oil from the breather, this is due to the gravity....the oil will slowly seep through the oil pump and collect in the bottom of the crankcase and get blown out the breather when the bike is started ...

Good luck...i hope this helps

Dec 13, 2010 | Harley Davidson XL Sportster 883...

2 Answers

Its blowing oil out of the oil cap why would this be ?? also i bit of white smoke then came out the back


The oil level may be too high.
Is the filler cap tight?
blow-by in the cylinder piston rign area. A wet test of engine compression will detect this.
A bad had gasket. Engine will be over heating as water is being used up during combustion.
Bad head gasket. Could explain white smoke in exhaust.

If the engine is overheating I would be suspecting a problem in the head area.

Good Luck. SnugglePants

Oct 26, 2009 | 1988 Mitsubishi Galant

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