I would rather ask then take a chance of fing up my bike...
how much residue do you guys see on the exhaust opening of your bikes?
I have a 05 F4i with a Yosh slip 4k kms'son and it looks pretty black and thick...
any thoughts? it runs fine with no power issues or lag issues good throttle response.
my dirt bikes did that alot but did not expect it from this one

Bish

 

Mine is pretty black too so im kinda curious myself. ive never had any problems though.

 

Same here with a 2 bros. Very black, but I think it's normal all the bikes I see look the same, regardless of make model and pipe. Every now and again I clean mine with aluminum polish. It doesn't shine like a new dime, but looks ok.

 

I just noticed this on my bike too. Bike was noticeably rich with a PowerCommander though. Guy behind me asked if I was running additive becasue he could "smell" my exhaust. Loaded a new map that is noticeably leaner. Will see if residue is lessened.

B.

 

As long as your not smoking i was told the residue is normal. Mine isnt really thick but its noticable and i have an 06

 

thanks for the responses, i have some free service from the stealership when i got the bike so next check i will have them look it up.