Why Am I Loosing Throttle Response!

[raptorman2001]

For some reason on my suzuki ltz400 i am loosing throttle response it used to have a full yoshi pipe and i had to jet the carb now i put stock pipe on and left the jet in the carborator could this cause my z to loose some of its pep

ya

[duke416ex]

Probably making it way to rich, check the plug. I am sure it was jetted way up for a full exhaust, I'd try to get a k&n to go with the exhaust you have ordered. Take the air lid off and see what that does.

[bwamos]

Yup. stock pipe is making it rich.. so you're bogging and sputtering, no? ;) And, even with proper jetting you won't have the same pep as the aftermarket. Stock exhausts are more restrictive so they meet EPA and dB ordinances.

[raptorman2001]

thanks for the help guys duke i am already running no air box lid i put that back on and it made it better:huh but yep bogging and sputtering is exactly right still looking for sum mori info

[bwamos]

If your running stock pipe again w/ airbox lid. go to a mainjet setting of 2 sizes above stock for a starting point.

Or even easier.. put the lid back on and go with stock jetting ;).

[mstrav1]

you must put the stock lid and stock main back in or it will have no power. I did the same a few years ago on my 03' z400

[raptorman2001]

ttt