As I understand it:
Yellow is lean
Blue is rich
Yellow is lean
Blue is rich
Ok, one more time. which color is which?
A yellow pipe is indicative of :
A) Lean conditions?
B) Rich conditions?
A) Lean conditions?
B) Rich conditions?
1 - 8 of 8 Posts
A yellow pipe may indicate nothing more that cheap chrome. Pipes will eventually yellow regardless of A/F ratio.
'05 FLHTI with a few clicks less than 10,000 miles. The front pipe is turning yellow. Cheap chrome or normal?A yellow pipe may indicate nothing more that cheap chrome
Yellow means the engine was actually started.
Blue means the bike was actually ridden. :brows:
Blue means the bike was actually ridden. :brows:
Martin64 said:A yellow pipe is indicative of :
A) Lean conditions?
B) Rich conditions?
Actually:
Blue is lean, yellow is rich.
Yellow is a condition of a rich air fuel ratio where the unburned fuel actually burnes in the headpipe. Allot of the time the chrome will actually bubble off of the headpipe. USUALLY the first 6~8 inches of the headpipe are discolored.
A Blue hue is a result of a lean air fuel ratio condition. Usually the first 8~10 inches of the headpipe are discolored and probably the collector area.
Even if the air fuel ratio is correct, some pipes WILL turn yelllow in the first 2~6 inches, this is due to the thickness of tubing used and pipe prep for chrome.
I saw allot of returns in my day. so I set up a test on the dyno one day to help out the warranty guy to prove what the colors really meant.
Hope this helps
I'm seeing yellow between the 1st and 2nd heat shields on the front pipe.
H-D RKC FLHRCI HDI EFI 2001: my "RIGHT" Screamin' Eagle Performance Muffler got yellow, but actually I have had no problem at all with it. My "LEFT" Screamin' Eagle Performance Muffler has NO discoloration, but the muffler itself literally DECAYED, with BIG/HUGE corrosive holes, just 3,5 years after the purchase (check out my thread "NEVER buy Screamin' Eagle Perfomance Mufflers! NEVER!") !
1 - 8 of 8 Posts
- This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
V-Twin Forum
V-Twin Harley Davidson forum. Discussion on V-Twin Harley Davidson motorcycles including Dyna, Electra Glide, Softail, Sportster, and more.
Full Forum Listing
Top Contributors this Month
View All
rootintootin
62 Replies
tall terry
56 Replies
Dan89FLSTC
53 Replies
