When to Use Motorcycle Oil Seal？

An oil seal on a motorcycle, also known as a shaft seal or a radial shaft seal, is a crucial component designed to prevent the leakage of oil or other fluids from one part of the motorcycle to another.Motorcycles rely on oil seals in critical areas where rotating shafts are present, such as the engine, transmission, and wheel hubs. Without high-quality motorcycle oil seals, essential systems could suffer from oil leaks, leading to reduced performance and mechanical damage.Oil seals play a key role in maintaining the integrity of these systems.

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Here are some key points about the oil seal on a motorcycle:

Key Functions of a Motorcycle Oil Seal:

The primary function of an oil seal on a motorcycle is to create a barrier that prevents the leakage of lubricating oil or other fluids from the components it is designed to protect. This is crucial for the proper functioning and longevity of various motorcycle systems.

Common Locations of Motorcycle Oil Seals:

Oil seals are typically found in areas where a rotating shaft exits a housing. Common locations include the crankshaft, camshaft, transmission input and output shafts, and the wheel hubs. In each of these locations, the oil seal ensures that oil does not escape and that contaminants such as dirt and water do not enter the system.

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Oil Seal Kit for Motorcycle

Construction of a Motorcycle Oil Seal:

Oil seals are typically made from elastomeric materials, such as rubber or synthetic rubber compounds, which provide flexibility and resilience. The outer part of the seal is usually made of metal to provide structural support and facilitate easy installation. The inner lip of the seal makes contact with the rotating shaft, forming a dynamic seal to prevent oil leakage.

Types of Motorcycle Oil Seals:

There are various types of oil seals, and the specific type used on a motorcycle depends on the application and the requirements of the system. Common types include lip seals, double lip seals, and oil seals with additional dust lips for added protection against contaminants.

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Why Motorcycle Oil Seals Are Important？

The proper functioning of a motorcycle's engine, transmission, and other critical systems relies on the effective sealing provided by oil seals. Without reliable oil seals, there is a risk of oil leakage, which can lead to insufficient lubrication, increased friction, and potential damage to vital components.

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Maintenance Tips for Motorcycle Oil Seals:

Oil seals, like many other motorcycle components, require regular inspection and maintenance. Over time, seals can wear out or become damaged, leading to oil leaks. If a seal is found to be faulty, it should be replaced promptly to prevent further damage to the motorcycle.

How to Replace a Motorcycle Oil Seal​​​​​​​:

When replacing an oil seal on a motorcycle, it's important to use a seal that matches the specifications of the original equipment. This ensures proper fit, function, and compatibility with the lubricants used in the motorcycle.

In summary, the oil seal on a motorcycle is a critical component that prevents the escape of oil and the entry of contaminants in rotating shaft applications. Regular inspection and timely replacement of worn or damaged seals are essential for maintaining the optimal performance and longevity of a motorcycle's mechanical systems.

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Ensure your motorcycle performs at its best with high-quality motorcycle oil seals from KINGSEAL. Browse our extensive product line and find the perfect oil seal kit for your needs.

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Tugboat

• Puppet
• Master
• Posts: 1,778
• '75 CB750K + '67 CL90 + '71 CT90

What do you think about putting stop-leak in motorbike motors?

« on: April 15, , 08:45:51 AM » Kind of a general question I know....

Without getting into "why don't you just fix it properly?" (seriously!) what is your opinion of using some kind of oil stop-leak in motorcycle engines?

Mine: 50/50 shot that it'll work, and if it doesn't, you're not any worse off than before you added it.

Others have suggested that considering the smaller oil passages in motorcycle engines, it might restrict oil flow and cause additional damage.

FWIW, I'm planning on riding the bike in question for 24 hours straight in a few weeks, which is why I'm asking. If it's worth doing, it's worth doing twice.

Jerry Rxman Griffin aka MuthaF'er

• This MuthaF'er is getting to be a
• Really Old Timer ...
• Posts: 14,957
• Bought her new 4/75

Re: What do you think about putting stop-leak in motorbike motors?

« Reply #1 on: April 15, , 08:51:22 AM » I'd be concerned with the clutch! As of today 3/13/ my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

ekpent

• Really Old Timer ...
• Posts: 13,508
• To many bikes-but lookin' for more

Re: What do you think about putting stop-leak in motorbike motors?

« Reply #2 on: April 15, , 08:57:27 AM » Clutch and those oil ports in the heads are very tiny, at least on a 750. I would not do it personally. Be interesting to see if someone has though. « Last Edit: April 15, , 08:59:26 AM by ekpent »

grasscutter

• Enthusiast
• Posts: 243
• Love the CB650.

Re: What do you think about putting stop-leak in motorbike motors?

« Reply #4 on: April 15, , 09:46:21 AM » NO!!

Not for wet clutch. Come on!  We're burning daylight!

Bootlegger56

• Butch
• Hot Shot
• Posts: 401
• Nuthin' taps ya out quicker than cole corn likker!

Re: What do you think about putting stop-leak in motorbike motors?

« Reply #9 on: April 15, , 11:09:44 AM » An old used car trick was to put a container of brake fluid in the crankcase to seal main and timing leaks.  It was also used in transmissions and diffs.  The interpretation was that the brake fluid would cause swelling of the seal and stop the leak.  I have personally seen this work on a number of occasions.  The downside is that the seal sometimes suffers catastrophic failure as a result and then you have no choice but to correct the problem.  I do not know the effect on wet clutch's but would not try it on anything I own unless it was an emergency situation.  It might provide a temporary patch for a dire straits circumstance!  Sort of like sawdust or banana's in the trans or diff. Ya can travel near or ya can travel far; but no matter where ya go thar ya are!

750 K5
550 K1

PeWe

• Really Old Timer ...
• Posts: 15,905
• Bike almost back to the 70's

Re: What do you think about putting stop-leak in motorbike motors?

« Reply #13 on: April 15, , 11:08:21 PM » So what if it leaks a little?
If you have a leak thru the rubber pucks under the cam towers no anti-leak stuff can help without destroying the engine.
The bearings need right viscosity of the oil. Too thick oil will not provide the bearings with oil when cold as needed. CB750 K6-76  970cc (Earlier cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -
http://forums.sohc4.net/index.php/topic,.msg.html#msg
The billet block build thread
http://forums.sohc4.net/index.php/topic,.msg.html#msg
CB750 K2 -  build thread
http://forums.sohc4.net/index.php/topic,.msg.html#msg
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,.msg.html#msg
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,.msg.html#msg

InTheStreet

• Ha, you let me be a
• Full Member
• Posts: 87
• When in doubt, flounder about.

Re: What do you think about putting stop-leak in motorbike motors?

« Reply #15 on: April 16, , 03:39:40 AM »

Do fresh gaskets leak a bit until they have a good run to heat up and seal? I've got some new covers that have a bit of weep. They're good and tight

When you say good and tight, do you mean tight, or do you mean properly torqued to the correct spec? CB550K1
CB650C (parting out)
GL (sold and missed)

lucky

• Really Old Timer ...
• Posts: 6,715

Re: What do you think about putting stop-leak in motorbike motors?

« Reply #17 on: April 17, , 12:47:40 PM » You gotta be kidd'n!!!!!

Jerry Rxman Griffin aka MuthaF'er

• This MuthaF'er is getting to be a
• Really Old Timer ...
• Posts: 14,957
• Bought her new 4/75

Re: What do you think about putting stop-leak in motorbike motors?

« Reply #21 on: April 17, , 09:00:26 PM » Understand that. High mileage oils often have seal conditioners too. As of today 3/13/ my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Don R

• My Sandcast is a
• Really Old Timer ...
• Posts: 20,589
• Saver of unloved motorcycles.

Re: What do you think about putting stop-leak in motorbike motors?

« Reply #22 on: April 17, , 09:33:02 PM »  I wouldn't be afraid to try a little high mileage oil, I thought of using a quart with my next oil change. Obviously motorcycle oil for a wet clutch is best but some guys are running about every type of oil with no major issues. Maybe change your oil a little sooner with it in there.
 NO brake fluid in a motor ever.
No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
 You don't need a weatherman to know which way the wind blows.