[FunkRegulator]

im confused. i was running my bike with K&N filter, two brothers slip on, 142.5 mikuni mains, 17.5 pilots, about 2.5 a/f mix, 4th clip position. it ran great. i got a good deal on a full acropovic exhaust, put it on and now my bike runs awful. the idel is fine and up to about 3000 rpm is good but when i try to open it up, there is absolutly no power. it bogges out really bad and i couldnt get over 90mph. the paper that came with the exhaust said that its ment to work with stock carb settings but WTF, its a full system thats built way better than stock. i put the stock air filter on and it ran a bit better so im thinking im just running way lean. any suggestions.

 

[Northwind]

Yup, logically you're likely to be running lean- I had the same thing happen (but more so) when I fitted my BMC Race RS filter without rejetting from the Renegade one, it idled fine but above 5000 it was unrieable. FWIW I'm running DJ170s now with a Race RS, WRP system and tank spacers- though the Race RS is a free-er flowing item than the K&N.

 

[canus]

+1 on the lean

You need more fuel.... ;D

 

[FunkRegulator]

yeah if figured. does any one have any bigger jets so i dont have to go to the bike shop again...im thinking ill try 147.5 or 150. also the front exhaust header seems to have a small leak. it just doesnt want to seal. what can i use to fix this?

 

[joonass]

What mains are you guys using with complete exhaust systems?
I have a Micron Zeta Full Race system, and im running 137.5 mains now, tried 142.5 without fiddling with any other settings.
My bike was earlier re-jetted and tuned for a Arrow (crap btw.) do-it-yourself slip-on by the previous owner.
Oh and i also have an BMC Street filter + Factory kit. What mains should I use, 145 are the biggest ones the sets got.
Prolly ill just take it for rejetting again and let the tuner worry about jets etc, asked him and he said that I wouldnt necessary need bigger jets  ???
And FunkRegulator, my system had also paper that said that the carb settings dont necessarily have to be tuned, I was also like WTF

 

[algreen]

Based on the rpm range, the cahrt tells you the carb system that's being effected...

http://auto.howstuffworks.com/framed.htm?parent=question377.htm&url=http://204.71.0.3/motoprof/moto/mcycle/carb101/carb101.html