New to the Forum and asking advice
#1
07-31-2008, 06:40 PM
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!
#3
07-31-2008, 07:44 PM
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.
#4
07-31-2008, 08:20 PM
Join Date: May 2008
Location: West By God Virginia!
Posts: 6,656
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.
#5
07-31-2008, 11:20 PM
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.
#6
07-31-2008, 11:21 PM
just so you're clear, the KLX250S specific slip-ons like the 2-bros., hmf, fmf will not fit the 300 header because that header is longer.
#7
07-31-2008, 11:39 PM
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?
#8
07-31-2008, 11:50 PM
Join Date: May 2006
Location: White Rock, BC
Posts: 881
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.
#9
07-31-2008, 11:54 PM
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.
#10
08-01-2008, 12:18 AM
Join Date: Nov 2005
Location: Washington
Posts: 21,060
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.