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Aug 18th, 2007, 08:39 AM
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#1 | | More than 100 posts!
Join Date: Dec 2006 Location: NY
Posts: 160 Model: Triumph Bonneville 07 Interests: ride, watch movies, make jewelry Occupation: restaurant business
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I have a 2007 bonneville. The exhaust pipes have turned purple by the motor and then have yellow further on down them. Which is normal. only the exhaust pipe on the right side of the bike has yellow extending further on it then on the left pipe. Is that some kind of indication of something going wrong in the motor. One of the cylinders going wrong? any suggestions would be appreciated. fireitup | 
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Aug 18th, 2007, 10:07 AM
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#2 | | Administrator Frequent Posting Club
Join Date: Jan 2005
Posts: 1,204 Model: Harley FLHX Occupation: Web Developer by day, 25+ years of carb building by day, hey what happened to my day?!
| The purple actually sounds like bluing which is caused by a lean condition. When the fuel mixture becomes lean it causes the pipes to overheat (and overheating in general), especially where the pipes meet the heads. The chrome then turns blue. Correcting the fuel mixture will help stop problem from spreading... somewhat. Almost all pipes get a little bit of bluing unless they are designed to be "blue-proof", which usually involves double wall construction to shield the outer chrome. After you correct the condition causing the blues, there are products out there that remove the bluing from the pipes. | |
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Aug 18th, 2007, 01:25 PM
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#3 | | More than 100 posts!
Join Date: Dec 2006 Location: NY
Posts: 160 Model: Triumph Bonneville 07 Interests: ride, watch movies, make jewelry Occupation: restaurant business
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thank you for the advice. running lean is not good. and i was told the bluing was normal because of the emission controls on the bike. Only i see it is not. Thank you again. fireitup | |
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Aug 21st, 2007, 01:31 PM
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#4 | | Has posted 500+
Join Date: Jun 2004
Posts: 1,779
| Emissions controls cause the bike to be lean from the factory.
You need to richen up the fuel mix a bit, powercommander for EFI or rejet for carbs. | |
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Aug 21st, 2007, 03:31 PM
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#5 | | More than 100 posts!
Join Date: Dec 2006 Location: NY
Posts: 160 Model: Triumph Bonneville 07 Interests: ride, watch movies, make jewelry Occupation: restaurant business
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Thank you for the advice. Why they work it that way leave the factory running lean i don't understand. Lean is not good. That much i do know. Thank you for the advice. fireitup | |
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Aug 21st, 2007, 06:46 PM
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#6 | | Moderator Has posted 500+
Join Date: Jul 2005
Posts: 4,020
| Quote:
Originally Posted by fireitup  Thank you for the advice. Why they work it that way leave the factory running lean i don't understand. Lean is not good. That much i do know. Thank you for the advice. fireitup | it is our friendly govt. saving us from ourselves!!!!!
very scary sentence...." hello, im from the govt. and i am here to help you!!"....   | |
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Aug 22nd, 2007, 07:28 AM
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#7 | | More than 100 posts!
Join Date: Dec 2006 Location: Cape Coral, Florida
Posts: 124 Model: '04 FXDL Interests: drag racing, muscle cars, street rods, annoying others
| Regarding the color difference of the two pipes, not sure about the EFI control system on your Triumph, but most systems now let you tune the cylinders individuley. The inherient properties of a intake can have one cylinder running richer or leaner then the other. With a carb there was nothing that could be done, but with EFI should be able to "balance" the cylinders. | |
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Aug 22nd, 2007, 05:20 PM
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#8 | | More than 100 posts!
Join Date: Dec 2006 Location: NY
Posts: 160 Model: Triumph Bonneville 07 Interests: ride, watch movies, make jewelry Occupation: restaurant business
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Hi Thank you for the advice. I have a mechanic here who works only on bristish bikes. I am not inclined to deal with triumph and their warrenty. When i called the company to ask for info about it i never got a return call. So their motto "go yur own way " i get. fireitup | |
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