blue flame when down shifting?

[Devin 05 Civic]

my girl and i have an 04 ninja 636, its our 1st bike. usually it sounds like its back firing when i down shift at mid rpms, but i figured it was just back pressure and i asked some1 else and he also agreed. i took it out tonight and realized that when it does pop, blue flames flow out the muffler. could this b that the bike is just running to rich? im a noob, srry if its a normal thing lol

[J@meson]

Its normal with a aftermarket exhaust...

[neondriver]

normal, i have a 05 with full exhaust i keep cleaning the upper portion of my exhaust because its always black....turns out mine shoots a small blue flame all the time either hard acceleration or downshifting...

[Devin 05 Civic]

thats what mines doing, never noticed till last night. hard to believe that its normal lol

[neondriver]

thats what mines doing, never noticed till last night. hard to believe that its normal lol

i put my stock exhaust on and removed my power commander at one point and it stopped. i believe the stock exhaust header has built in cat/ spark arestor while the aftermarket does not.

[Kabron]

Sounds like a cool bonus, I wouldn't be concerned with it.

[ibidu1]

I would change the plugs, clean air filter, check and clean pair valve if it has it

[Clawhammer]

Running rich. Bikes run rich from the factory, throw an aftermarket exhaust on and you get fire.

[ibidu1]

It shouldn't run rich at stock, if that's the case bikes from the dealer will end up lemon lawed. A tune up is first thing I would do

[Devin 05 Civic]

it has aftermarket exhaust and power commander

[Signal7cbr!]

its to be expected

[SayWhaa?]

get some marshmallows.

[ibidu1]

it has aftermarket exhaust and power commander

Sounds like the map you are running in it now is off. Get it tuned or get a new map online. But I would still throw in new plugs before you do any kind of tuning

[ibidu1]

get some marshmallows.

And hookers

[SayWhaa?]

And hookers

fuck... how did i forget about the hookers!?