New to the Forum and asking advice
Thread Starter
|
Junior Member
Joined: Jul 2008
Posts: 4
New to the Forum and asking advice
Hello all. I am a new member. Just purchased a 2009 klx 250s few weeks ago getting ready for rejetting (dynojet kit) and purchased a two brothers slip on. Is there a header pipe that fits the 09 from 2 bros? Or are there any other suggestions?
Thanks!
Thanks!
Banned
1st Gear Member
Joined: Mar 2008
Posts: 1,078
no, there is no 2-bros. headpipe. you should've got a full system if you wanted to change out the header. the 300 header is the same identical pipe as the 250, just an inch longer or so. it offers no performance unless you couple it with the 300 muffler which will make just as much power as a 2-bros. slip-on will.
the 250's header won't affect performance that bad until you switch to 300cc or above in which it will suffer from not enough room to breathe out. but make no mistake about it, the header is one of the top three things to yank off the bike and replace as it is very limiting to how much power the bike can be capable of producing. stick to your stock one for now, install the jet kit properly, and add a hi-flo air filter and you'll be amazed.
the 250's header won't affect performance that bad until you switch to 300cc or above in which it will suffer from not enough room to breathe out. but make no mistake about it, the header is one of the top three things to yank off the bike and replace as it is very limiting to how much power the bike can be capable of producing. stick to your stock one for now, install the jet kit properly, and add a hi-flo air filter and you'll be amazed.
Senior Member
1st Gear Member
Joined: May 2008
Posts: 6,656
From: West By God Virginia!
no, there is no 2-bros. headpipe. you should've got a full system if you wanted to change out the header. the 300 header is the same identical pipe as the 250, just an inch longer or so. it offers no performance unless you couple it with the 300 muffler which will make just as much power as a 2-bros. slip-on will.
the 250's header won't affect performance that bad until you switch to 300cc or above in which it will suffer from not enough room to breathe out. but make no mistake about it, the header is one of the top three things to yank off the bike and replace as it is very limiting to how much power the bike can be capable of producing. stick to your stock one for now, install the jet kit properly, and add a hi-flo air filter and you'll be amazed.
the 250's header won't affect performance that bad until you switch to 300cc or above in which it will suffer from not enough room to breathe out. but make no mistake about it, the header is one of the top three things to yank off the bike and replace as it is very limiting to how much power the bike can be capable of producing. stick to your stock one for now, install the jet kit properly, and add a hi-flo air filter and you'll be amazed.
Banned
1st Gear Member
Joined: Mar 2008
Posts: 1,078
on what? you basically said that you weren't sure, but thought a header exactly like the one that comes stock on the 250 would fit. it will only fit with the 300 muffler or a slip-on made for the 300.
Senior Member
1st Gear Member
Joined: Jul 2008
Posts: 852
From: Austin, TX
So, a cheaper way would be to grab a full klx300 exhaust system and that would equal the performance from an fmf or big gun or whatever slip-on? Rejetting and airbox lid off? Not to threadjack but if you have the airbox lid off, how wet does it have to get before you're drowning the thing? Will heavy rain get to it?
Senior Member
1st Gear Member
Joined: May 2006
Posts: 881
From: White Rock, BC
1st Gear Member
A couple thoughts to add...
1. Some people report that too big of a head pipe reduces low end torque (bigger isn't always better for header pipes)
2. No, heavy rain won't really affect you much with the airbox lid off... Though, it might result in more roadspray getting onto the filter. There is a more direct path for mud splashes etc to find their way onto the filter element. I'm not totally comfortable running with no lid at all, so I just enlarged the hole to about 2 x 3 inches for easier airflow. It still provides some "splash protection".
Just keep a close eye on your filter cleanliness. Especially after a muddy, wet ride.
1. Some people report that too big of a head pipe reduces low end torque (bigger isn't always better for header pipes)
2. No, heavy rain won't really affect you much with the airbox lid off... Though, it might result in more roadspray getting onto the filter. There is a more direct path for mud splashes etc to find their way onto the filter element. I'm not totally comfortable running with no lid at all, so I just enlarged the hole to about 2 x 3 inches for easier airflow. It still provides some "splash protection".
Just keep a close eye on your filter cleanliness. Especially after a muddy, wet ride.
Senior Member
1st Gear Member
Joined: Jul 2008
Posts: 852
From: Austin, TX
A couple thoughts to add...
1. Some people report that too big of a head pipe reduces low end torque (bigger isn't always better for header pipes)
2. No, heavy rain won't really affect you much with the airbox lid off... Though, it might result in more roadspray getting onto the filter. There is a more direct path for mud splashes etc to find their way onto the filter element. I'm not totally comfortable running with no lid at all, so I just enlarged the hole to about 2 x 3 inches for easier airflow. It still provides some "splash protection".
Just keep a close eye on your filter cleanliness. Especially after a muddy, wet ride.
1. Some people report that too big of a head pipe reduces low end torque (bigger isn't always better for header pipes)
2. No, heavy rain won't really affect you much with the airbox lid off... Though, it might result in more roadspray getting onto the filter. There is a more direct path for mud splashes etc to find their way onto the filter element. I'm not totally comfortable running with no lid at all, so I just enlarged the hole to about 2 x 3 inches for easier airflow. It still provides some "splash protection".
Just keep a close eye on your filter cleanliness. Especially after a muddy, wet ride.
Your Humble Moderator/Admin
Joined: Nov 2005
Posts: 21,060
From: Washington
1st Gear Member
I've been running without an air box lid for 6000 miles and I've never had moisture in it, and we get 120-140 inches of rain a year, plus I wash my bike like every week, and still nothing. Unless you turn your bike into a green submarine, it will be fine. Oh and take off that drain on the bottom of the air box, that way if you do get water in there it can get back out.