Blue pipe...rich or lean??

[skids]

When the temps are cold, the bike will take longer to heat up to normal temperatures. The "choke" doesn't look like it would compensate at the higher throttle positions.

Originally posted by beechfront
though this does not apply to your blueing....

last winter i went out driving on a cold, cold day - and all my pipes blued.
(snip)
ANYWAY - a guy once told me that blueing can be the result of extreme temperature changes - he said it happened on his bike when cold water would splash up on the pipes.

my 2 cents.

[skids]

Re: pipes colour

Steve, colortune is a good tool for checking for relative differences between carbs, but in my opinion, it can't really tell you what is happening under load or at rpms above the idle circuit
The grey might be a good color for the throttle position that you tested it if you did the throttle chop, but if you just looked at it after a day of all around riding, you might have a range where it is lean. Idle mixture screws have very little affect on richness at the higher throttle positions, so if that is where your leaness is, yes, go with bigger mains. I think you are close, maybe close enough. I wonder if, once pipes have blued, they tend to blue (or brown or gold) easier at lower exhaust temperatures. The more you rub that stuff off, the more of the plating you remove...right?

Originally posted by young nip
Hi guys,
I put a pile of miles on my bike the other day.(snip) The plugs are clean and slightly coloured as Ive mentioned .more grey than the tan Ive had in the past.(snip)Newer larger jets are cheap. Is this the route to go other than sync and also trying to do the idle tweeking with the idle screws. I think my bluing is more of a main jet lean problem. just thinking.
Steve

[young nip]

pipes

Thanks for the input skids. Anyway i think I am almost there too ,to having it just right.The bike goes through the rpms smoothly and quickly. The idle on my bike is set rich. That eliminates the pop and the popping when theres back pressure. Ehaust is sealed so no leaks. Iwas lean on the higher rpms of the band before the jet increase. I am thinking that the plugs are almost the right colour with the chop at high rpms ,but they always look too clean.Real clean at 8 grand.( not white). i am running an ngk bpr 7 right now. With dennys jetting formula I am .5 on the lean side of the main jet size i went to. Im running 140's (jet size) If I went to 142.5 and back to an ngk 6, would that eliminate my low rpm richness and give enough fuel so the plugs will be slight darker in colour at higher rpms.Larger main and Stay with the ngk 7's??what about fuel mileage. Would there be that much difference of improvement in performance..As for the pipes they return to that dark chrome colour since it cooled. blue is gone.As for the blue , I dont give the bike enough time to run at idle ,cause Im on the move, so thats why I was wondering if I may be on the lean side yet at highrpms and if more fuel at those rpm levels may help the bike run cooler.I like to use auto -sol and never dull on the pipes. A good coat of wax to follow.Lots of finish left.
Just thinking again when I should be working. Appreciate the imput guys.
Steve