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Discussion Starter · #1 ·
Hey guys,
I'm a new Bonnie owner (long time admirer) and I have a few questions that I hope you more experienced guys could answer. Her previous Owner did the air box removal and I'm just going through everything to make sure it was done correctly. One thing in question is the crankcase breather. I've seen photos that show these nicely routed but this one is just sitting on the crank case. Is it ok there or should I find a new location for it? If so where and how do I go about doing so. I apologize ahead of time for my future ignorance. Can I just buy the same size neoprene tubing from the hardware store and reroute it somewhere? If so, how would you secure it? Thanks for your responses.


Travis
 

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One thing in question is the crankcase breather. I've seen photos that show these nicely routed but this one is just sitting on the crank case. Is it ok there or should I find a new location for it? If so where and how do I go about doing so. I apologize ahead of time for my future ignorance. Can I just buy the same size neoprene tubing from the hardware store and reroute it somewhere? If so, how would you secure it?
You can buy the tubing from any auto store, 1/2" car heater hose would do the job. On the end should be a small filter, similar to a pod filter but smaller, which cleans the air as it pumps in/out of the crank case (the hose originally connected to the airbox).

Location for the filter should be as high as possible since oil vapour will condense and make a bit of a mess, especially on a 2002 which had the internal breather tube. Later models had a labrynth system which prevented oil from being ejected from the breather tube and filling the airbox, something that has happened a few times on here with earlier models. Most will fabricate a small bracket and secure the filter between the carbs.

How do I post a photo to show what I'm talking about?
Read the stickies:
http://www.triumphrat.net/air-cooled-twins-technical-talk/95944-how-to-post-photos.html
 

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Discussion Starter · #4 ·


Thanks for your detailed response! I suppose I will try and fab up a bracket somehow, not sure how to secure the actual filter itself, are you referring to fabbing a bracket to secure the hose or the filter (any photos of this done would be greatly appreciated. I'll try and figure something out. Thanks again!
Here is a photo of the filter/crankcase breather filter. As you can see he just had it sitting on the crank case.
 

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Discussion Starter · #5 ·
You can buy the tubing from any auto store, 1/2" car heater hose would do the job. On the end should be a small filter, similar to a pod filter but smaller, which cleans the air as it pumps in/out of the crank case (the hose originally connected to the airbox).

Location for the filter should be as high as possible since oil vapour will condense and make a bit of a mess, especially on a 2002 which had the internal breather tube. Later models had a labrynth system which prevented oil from being ejected from the breather tube and filling the airbox, something that has happened a few times on here with earlier models. Most will fabricate a small bracket and secure the filter between the carbs.



Here is a photo of the bike! I'll be getting a new seat In a few days.

 

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On a 2002 engine the breather hose could be 1/4" inside diameter, I believe.

Make sure it fits easily, use a little lube on it if necessary. Forcing it can dislodge the spigot and damage the internal breather pipe fitted to those early breathers.
 

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I suppose I will try and fab up a bracket somehow, not sure how to secure the actual filter itself, are you referring to fabbing a bracket to secure the hose or the filter (any photos of this done would be greatly appreciated. I'll try and figure something out.
I don't have any photos since I decided to keep the airbox when I tuned my bike, but you will find some related threads if you use the Google search bar at the top of the page and search for 'crankcase breather'.

I see from your picture that you already have the filter. I suggest that you take off the filter and tube from the crankcase, separate the two, and take the bit of tube to an auto parts shop, where they will supply you with a longer length of the same tube.

On reassembly, instead of using the pipe clip to attach the filter to the tube, use a P clip, which has a mounting hole. You can then attach the filter somewhere higher on any convenient bolt. As said, most of those that I have seen are mounted between the carbs, probably fixed to the cylinder head engine mount bolt.

As Forchetto said, be very careful when attaching the tube to the crankcase spigot. This goes through the case and plugs into a hole behind the clutch. It is only made of thin aluminium so is easily damaged.

Unless you have already ordered your seat, the Burton seats are very highly recommended on here for comfort and looks. I have the grey top DS002 on my bike:




http://www.burtonbikebits.net/triumphbonneville.htm

And my bike with the seat on it:

 

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Messy breathing

As Forchetto said, be very careful when attaching the tube to the crankcase spigot. This goes through the case and plugs into a hole behind the clutch. It is only made of thin aluminium so is easily damaged.[ QUOTE ]

Mr. bonnieraitt,

To put it another way, the end of the aluminum tube that protrudes thru the crankcase, is only held in place by it's location in the clutch cover, and an O-ring that seals the end thru the case. The tube it self is very malleable, and will be bent if you try pull to hard removing the rubber breather tube.
Try using appropriate pliers to rotate the rubber, to break the bond from the breather tube, or if necessary cut a slice in the rubber to free it from the piece that protrudes from the case.

Charles
 

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Discussion Starter · #10 ·
I don't have any photos since I decided to keep the airbox when I tuned my bike, but you will find some related threads if you use the Google search bar at the top of the page and search for 'crankcase breather'.

I see from your picture that you already have the filter. I suggest that you take off the filter and tube from the crankcase, separate the two, and take the bit of tube to an auto parts shop, where they will supply you with a longer length of the same tube.

On reassembly, instead of using the pipe clip to attach the filter to the tube, use a P clip, which has a mounting hole. You can then attach the filter somewhere higher on any convenient bolt. As said, most of those that I have seen are mounted between the carbs, probably fixed to the cylinder head engine mount bolt.

As Forchetto said, be very careful when attaching the tube to the crankcase spigot. This goes through the case and plugs into a hole behind the clutch. It is only made of thin aluminium so is easily damaged

Think something like this would work?



 

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Yep, that would do it.
 

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Discussion Starter · #13 ·
On a 2002 engine the breather hose could be 1/4" inside diameter, I believe.

Make sure it fits easily, use a little lube on it if necessary. Forcing it can dislodge the spigot and damage the internal breather pipe fitted to those early breathers.
Thanks for the insight and instruction. I believe I have found a solution thanks to all of your help. I appreciate the photo and advises me to take precaution with the spigot, I would've have no idea otherwise. I'm loving this bike and I want to keep it in tip top shape and get some longevity out of it.
 

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Thank you so much! This has helped/educated me immensely. Thanks to everyone who replied.
I suggest you get a service manual (different from owners manual) from Hayne's or from Triumph and read up on your new (to you) Triumph motorcycle. Search and read as much as you can about your cycle from this site and interweb. Many Triumph owners do the service work themselves as these bikes are somewhat easy to work on and you can save a ton of money. And always feel free to ask for help.
 

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Discussion Starter · #15 ·
I suggest you get a service manual (different from owners manual) from Hayne's or from Triumph and read up on your new (to you) Triumph motorcycle. Search and read as much as you can about your cycle from this site and interweb. Many Triumph owners do the service work themselves as these bikes are somewhat easy to work on and you can save a ton of money. And always feel free to ask for help.

I do have a Haynes manual, it came with the bike so I'll be refering to it often. This was just a situation where the Haynes manual couldn't help, it being an aftermarket setup that is. Thanks for the advice!
 
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