Replace Gasket?

[Slv3]

I have some leakage from #4 cylinder manifold on my 01 Standard (11,200 Miles).
The image shows the total amount of leakage from summer riding (have not cleaned all summer).
Do I just remove the 2 manifold nuts and top boot to replace gasket? Thanks.

[Hook#3287]

Yes.

I've found it's easier to remove all three on one side at a time.  That way you can move the carb bank up slightly to get more room.

I use a very slight amount of grease on the new o-rings to keep them from falling out on install.

[Slv3]

Good point, I’ll replace all 3 rings at that time. Thanks for your help!

[98valk]

not leaking. that is just the o-ring coating to hold them in place during assembly, which seeps out over time due to heat. no worries and no reason to replace them.

[Bighead]

Not trying to be an ass here but 11,200 ? The block on that thing looks like it has  200,000 miles.

[Bighead]

not leaking. that is just the o-ring coating to hold them in place during assembly, which seeps out over time due to heat. no worries and no reason to replace them.

I would disagree. Mine has over 120k on it and has never once had any type of stain on it in that area.

[Slv3]

Nope, only 11,200. Not a bath all summer and and rode through some good storms.
Nicest riding bike out of the 3 in my garage.

[sandy]

Go to your local seal/O ring supply and get six #123 O rings in Viton or silicone. You'll never have that problem again.

[Slv3]

Will do, thanks.

[The emperor has no clothes]

If you can't find them locally, Carolina Bike & Trike has them.

[Chrisj CMA]

not leaking. that is just the o-ring coatilling to hold them in place during assembly, which seeps out over time due to heat. no worries and no reason to replace them.

It's leaking. Would probably not be a serious problem for awhile but it will stay cruddy and soon be a vacuum leak. 

Best to change them

[Robert]

If you cannot find the seals clean the surfaces up really well, clean the old gasket up and put just a very thin layer of silicon on the surfaces. It squishes out so thin that when you take them off again its just a transparent layer but it stops that issue and seals better than gasket alone. I liked it because it would seal the entire surface of where the head contacted the manifold and it was less area for dirt and water to get into.

[Ricky-D]

Pay attention to what CA says. There is absolutely no reason to replace any 'O' rings that are not leaking. There is only one ring on my bike that ever need replacing, so why would I want to do all six?

Besides, the ill conceived work, you take a chance of screwing up something else or causing more unanticipated problems.

You would not let your car dealership perform any unnecessary work on your car, so why would you want to do the unwarranted work on your bike?

Changing all six 'O' rings is not preventive maintenance and it's foolish to think it is. There is no schedule for replacement of those 'O' rings.

There are many that will take exception to what I post here, but that's Ok. What I profess is good solid common sense.

***

[Gryphon Rider]

not leaking. that is just the o-ring coating to hold them in place during assembly, which seeps out over time due to heat. no worries and no reason to replace them.

I have wondered about it being a "leak".  The air/fuel mixture passing through there has negative pressure (vacuum), so it doesn't make sense to me that it is forced out past a seal.  If anything, it should be sucked back in.  What I do know is that replacing the O-rings with ones from CB&T solved the problem.

[Ricky-D]

I don't believe it has anything to do with pressure/vacuum. The velocity of the mixture may cause a little condensation inside the pipe which after the engine shuts down want's to tend to collect at the joint and seep out after enough collects.

***

[Gryphon Rider]

Pay attention to what CA says. There is absolutely no reason to replace any 'O' rings that are not leaking. There is only one ring on my bike that ever need replacing, so why would I want to do all six?

Besides, the ill conceived work, you take a chance of screwing up something else or causing more unanticipated problems.

You would not let your car dealership perform any unnecessary work on your car, so why would you want to do the unwarranted work on your bike?

Changing all six 'O' rings is not preventive maintenance and it's foolish to think it is. There is no schedule for replacement of those 'O' rings.

There are many that will take exception to what I post here, but that's Ok. What I profess is good solid common sense.

***

What are the possible specific down-sides of replacing those o-rings unnecessarily, other than wasting the minimal cost of these parts and possibly missing an episode or two of Counting Cars?

[Chrisj CMA]

Pay attention to what CA says. There is absolutely no reason to replace any 'O' rings that are not leaking. There is only one ring on my bike that ever need replacing, so why would I want to do all six?

Besides, the ill conceived work, you take a chance of screwing up something else or causing more unanticipated problems.

You would not let your car dealership perform any unnecessary work on your car, so why would you want to do the unwarranted work on your bike?

Changing all six 'O' rings is not preventive maintenance and it's foolish to think it is. There is no schedule for replacement of those 'O' rings.

There are many that will take exception to what I post here, but that's Ok. What I profess is good solid common sense.

***

What are the possible specific down-sides of replacing those o-rings unnecessarily, other than wasting the minimal cost of these parts and possibly missing an episode or two of Counting Cars?

Don't change any orings for the intakes if you are unsure of causing other problems. 

I always change all six. Cheap. Only have to do it once.  Never had unintended consequences.

I would do a carb sync if any were really bad.

[Robert]

I don't believe it has anything to do with pressure/vacuum. The velocity of the mixture may cause a little condensation inside the pipe which after the engine shuts down want's to tend to collect at the joint and seep out after enough collects.

***

 

With that said to do the seals is easy not a big deal as long as the bike does not have the pods. Since you see the black on the top it means its leaking that means the seal is bad. Is it mission critical NO, but its elective maintenance and you get some one on one time with your bike. 

[The emperor has no clothes]

I had no idea replacing $10 worth of o-rings was controversial.

Once you will remove an intake runner, you will see they are squished down flat and have lost their seal. Unlike what some think, it is common sense to replace worn or deformed parts.

[Gryphon Rider]

I had no idea replacing $10 worth of o-rings was controversial.

Once you will remove an intake runner, you will see they are squished down flat and have lost their seal. Unlike what some think, it is common sense to replace worn or deformed parts.

Is that medical advice as well?  Marital advice?

[9Ball]

I have some leakage from #4 cylinder manifold on my 01 Standard (11,200 Miles).
The image shows the total amount of leakage from summer riding (have not cleaned all summer).
Do I just remove the 2 manifold nuts and top boot to replace gasket? Thanks.

I have a spare set of 6 new o-rings....pm me your address and I’ll send them to you by first class mail.

Free.

[Slv3]

Fellow member’s, I don’t post often but I check in and read posts many times a week.
I have learned so much from so many of you. It’s a good thing to get many points of
view. I’m going to change the o-rings at some point soon. Recently picked up a 71 Honda
CT70 and been busy restoring it. Thanks again for sharing your wealth of knowledge!

[RonW]

I’m going to change the o-rings at some point soon.

That's all good, but are you gonna replace all six o-rings?

[Robert]

As long as the orings are the same size as the OEM you can pick them up anywhere.

[retirednavy]

How do you know if the o rings are leaking? I have a new to me interstate im going over for a upcoming annual trip

[Chrisj CMA]

How do you know if the o rings are leaking? I have a new to me interstate im going over for a upcoming annual trip

Look at the photo of the gunk that leaks out in this thread

[The emperor has no clothes]

I had no idea replacing $10 worth of o-rings was controversial.

Once you will remove an intake runner, you will see they are squished down flat and have lost their seal. Unlike what some think, it is common sense to replace worn or deformed parts.

Is that medical advice as well?  Marital advice?

(all 3)

[Cracker Jack]

Pay attention to what CA says. There is absolutely no reason to replace any 'O' rings that are not leaking. There is only one ring on my bike that ever need replacing, so why would I want to do all six?

Besides, the ill conceived work, you take a chance of screwing up something else or causing more unanticipated problems.

You would not let your car dealership perform any unnecessary work on your car, so why would you want to do the unwarranted work on your bike?

Changing all six 'O' rings is not preventive maintenance and it's foolish to think it is. There is no schedule for replacement of those 'O' rings.

There are many that will take exception to what I post here, but that's Ok. What I profess is good solid common sense.

***

What are the possible specific down-sides of replacing those o-rings unnecessarily, other than wasting the minimal cost of these parts and possibly missing an episode or two of Counting Cars?

Don't change any orings for the intakes if you are unsure of causing other problems. 

I always change all six. Cheap. Only have to do it once.  Never had unintended consequences.

I would do a carb sync if any were really bad.

Strongly recommend you use a Digi-Sync for maximum accuracy.

[Dale_K]

If you have a little propane torch you can find out whether there is a vacuum leak by letting a little gas out from the tip (no flame) down at the suspect spot with the motor idling.  You'll hear the motor speed up slightly if there's a leak.

I've found leaking vacuum lines this way.

[98valk]

I had no idea replacing $10 worth of o-rings was controversial.

Once you will remove an intake runner, you will see they are squished down flat and have lost their seal. Unlike what some think, it is common sense to replace worn or deformed parts.

squished flat against a flat surface? u think an o-ring stays round in all installations?
 Yes, flat, that is how it seals. unless the flat surface of the o-ring is below the groove in the intake manifold it is still sealing.

[Slv3]

Replacing all 6

[Tourus]

     I bought a set of 6 a couple of months ago from redeye technical services, $15.64 shipped. Check them out they are the good ones.

[9Ball]

    I bought a set of 6 a couple of months ago from redeye technical services, $15.64 shipped. Check them out they are the good ones.

He has a set on the way...a lot cheaper too.

[Slv3]

9Ball, I received the o-rings you were kind enough to send. Thanks for the torque specs also!
Good folks is what makes this an outstanding forum 

[The emperor has no clothes]

9Ball, I received the o-rings you were kind enough to send. Thanks for the torque specs also!
Good folks is what makes this an outstanding forum 

[9Ball]

9Ball, I received the o-rings you were kind enough to send. Thanks for the torque specs also!
Good folks is what makes this an outstanding forum 

Enjoy...they should last you for a good long while.

[Forge]

You will not regret replacing them. It’s a relatively easy job.