BritBike Forum logo
BritBike SponsorBritBike SponsorBritBike SponsorBritBike SponsorBritBike SponsorBritBike Sponsor SteadfastCyclesBritBike SponsorBritBike SponsorBritBike SponsorBritBike SponsorHepolite PistonsBritBike Sponsor
Upgrade to: Premium Membership | Gold Membership | Life Membership | Vendor Membership | Site Sponsor Membership
Member Spotlight
BrizzoBrit
BrizzoBrit
Brisbane, Australia
Posts: 836
Joined: April 2007
ShoutChat Box
Comment Guidelines: Do post respectful and insightful comments. Don't flame, hate, spam.
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
a word from..
Manuals on DVD (Shipping included)
Previous Thread
Next Thread
Print Thread
Rate Thread
Bluing exhaust pipes
#442246 06/28/12 2:30 am
Joined: Feb 2007
Posts: 34
Britbike forum member
OP Offline
Britbike forum member
Joined: Feb 2007
Posts: 34
Hello all, I'm sure this might have been gone over several times before, but for the life of me I cannot find anything using the search option....ok that being said, could you guys help me figure out what are the possible causes of bluing on only one exhause pipe on a 67 thunderbolt, as i'm sure you all know its a single carb. 650, thanks guys

Support Your #1 BritBike Forum!

Check out British motorcycles for sale: British Motorcycles on e-Bay UK, British motorcycles on e-Bay North America
Re: Bluing exhaust pipes
PsYcHoBiLLYRocKeR #442247 06/28/12 2:34 am
Joined: Jul 2009
Posts: 3,518
Likes: 1
In Remembrance
Offline
In Remembrance
Joined: Jul 2009
Posts: 3,518
Likes: 1
Thin metal on the pipe,late ignition timing,leaner mixture on one cylinder(harder to fix wih only one carb).

Re: Bluing exhaust pipes
PsYcHoBiLLYRocKeR #442255 06/28/12 3:40 am
Joined: May 2005
Posts: 29
Britbike forum member
Offline
Britbike forum member
Joined: May 2005
Posts: 29
How do the spark plugs look? Is one white (lean) on the side with the blue pipe? If one ceramic insulator is white and the other tan or brown, you may have an air leak somewhere. Are the pipes modern replacements? Some of them are thin and, even if bought in a pair, can vary a small amount in wall thickness. If there is no air leak, an old trick (chewing gum and bailing wire, last resort variety) is to coat the interior of the blueing pipe with heat proof paint.


Jeff Connor
----------
1972 Norton Commando Roadster
----------
Re: Bluing exhaust pipes
VT Jeff #442259 06/28/12 6:47 am
Joined: Apr 2002
Posts: 957
Britbike forum member
Offline
Britbike forum member
Joined: Apr 2002
Posts: 957
Try doing a compression test. A slightly leaking exhaust valve will cause overheating on one side and blue a pipe.

Beezageezauk.


Re: Bluing exhaust pipes
PsYcHoBiLLYRocKeR #442508 06/29/12 11:12 pm
Joined: Feb 2007
Posts: 34
Britbike forum member
OP Offline
Britbike forum member
Joined: Feb 2007
Posts: 34
Thanks guys, I think I narrowed it down to a timing issue, I really appreciate the help

Re: Bluing exhaust pipes
PsYcHoBiLLYRocKeR #442509 06/29/12 11:21 pm
Joined: Jul 2011
Posts: 50
Britbike forum member
Offline
Britbike forum member
Joined: Jul 2011
Posts: 50
blueing and tarnishing.many years ago this said to be because of single nickle plating. double nickle plating and then chroming was the cure. has anything changed?

Re: Bluing exhaust pipes
beezageezauk #442550 06/30/12 11:46 am
Joined: Jul 2009
Posts: 3,518
Likes: 1
In Remembrance
Offline
In Remembrance
Joined: Jul 2009
Posts: 3,518
Likes: 1
Originally Posted by beezageezauk
A slightly leaking exhaust valve will cause overheating on one side and blue a pipe.

Quickest way to fix a slightly leaking exhaust valve is to give the engine a few rev-ups,with no exhaust pipes attached to the head.30 seconds of this treatment will normally show an improvement on the compression gauge.

Make a lot of noise,but you don't need excessive revs.Check valve clearances after the engine cools down.

Re: Bluing exhaust pipes
PsYcHoBiLLYRocKeR #442624 07/01/12 12:21 am
Joined: Feb 2008
Posts: 5,118
Likes: 56
Britbike forum member
Offline
Britbike forum member
Joined: Feb 2008
Posts: 5,118
Likes: 56
Hi Pete--I have seen you give this advice several times on this forum.
I am intrigued---how did you find out this was a good thing to do?
Hope you dont mind me asking.

Re: Bluing exhaust pipes
Tridentman #442642 07/01/12 3:50 am
Joined: Jul 2009
Posts: 3,518
Likes: 1
In Remembrance
Offline
In Remembrance
Joined: Jul 2009
Posts: 3,518
Likes: 1
Some things are invented,and some things are just discovered.I discovered this a little over 40 years ago,working on a bike that had been run with tight valve clearances.I had the pipe off to look at the exhaust valve.A few blasts without the exhaust pipe improved the compression.

I tried it later on a bike that had been stored about a year,and it was down about 30 psi on one cylinder.It all came back within a minute.

It seems to work,so I've done it on other bikes and got similar results when normal running wouldn't fix it.

Re: Bluing exhaust pipes
PsYcHoBiLLYRocKeR #442711 07/01/12 4:19 pm
Joined: Feb 2008
Posts: 5,118
Likes: 56
Britbike forum member
Offline
Britbike forum member
Joined: Feb 2008
Posts: 5,118
Likes: 56
Pete--thanks. Very interesting.

Re: Bluing exhaust pipes
Tridentman #442745 07/01/12 7:14 pm
Joined: Apr 2002
Posts: 957
Britbike forum member
Offline
Britbike forum member
Joined: Apr 2002
Posts: 957
Yes Pete...thanks from me also. I've had that problem a couple of times and taken the long route of a decoke and valve grind. I guess I'll be "annoying the neighbours" next time.

Beezageezauk.

Re: Bluing exhaust pipes
PsYcHoBiLLYRocKeR #443239 07/05/12 3:32 am
Joined: Feb 2007
Posts: 34
Britbike forum member
OP Offline
Britbike forum member
Joined: Feb 2007
Posts: 34
I've gone ahead and ordered a Pazon Ignition, if your interested in the results, i'll keep you posted

Re: Bluing exhaust pipes
Pete R - R.I.P. #443292 07/05/12 3:39 pm
Joined: Jan 2007
Posts: 67
Britbike forum member
Offline
Britbike forum member
Joined: Jan 2007
Posts: 67
pete r can you tell me how running without pipes restores the compression i am at a loss to see how it works.


love life
Re: Bluing exhaust pipes
roadrocket #443350 07/05/12 9:12 pm
Joined: Jul 2009
Posts: 3,518
Likes: 1
In Remembrance
Offline
In Remembrance
Joined: Jul 2009
Posts: 3,518
Likes: 1
I only discovered that it works,and often enough gets a 30 psi improvement.
I haven't discovered exactly why it works.

I can only assume that it's like de-scaling a copper head gasket,when you quench it.The crud/scale doesn't like hot exhaust followed by cold air,and it gets cleaned off.


Moderated by  Allan G, Jon W. Whitley 

Link Copied to Clipboard
Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | DVD- Manuals & Parts books
Upgrade to: Premium Membership | Gold Membership | Life Membership | Vendor Membership | Site Sponsor Membership
Powered by UBB.threads™ PHP Forum Software 7.7.4