Opening up the KLX250S
Senior Member
1st Gear Member
Joined: Jul 2009
Posts: 315
From: Bakersfield, CA
Thanks, I'll check it out right now.
That's the one.
7/64" is the recognized benchmark. Going bigger will have adverse effects, slide hover etc. You can get problems erratic idle. Mine is 7/64" and it idles great. Has great response too, for a CV type carb'.
7/64" is the recognized benchmark. Going bigger will have adverse effects, slide hover etc. You can get problems erratic idle. Mine is 7/64" and it idles great. Has great response too, for a CV type carb'.
Senior Member
1st Gear Member
Joined: Jul 2009
Posts: 315
From: Bakersfield, CA
Ok thanks, its drilled out but since I had the bike apart I took the screen out of the air box too so not too sure how much of a difference the drill did but the both of them sure made an improvement! Bike is running a little lean so now I get to change out the main jet.
Thanks again WestOzKLX.
Thanks again WestOzKLX.
Senior Member
1st Gear Member
Joined: Apr 2010
Posts: 200
From: CA
1st Gear Member
can you pleaes give me more info on this? i have removed teh snorkel from the airbox, is this the same thing in a sence? sorry about my ignoarance, just dont want to F someting up.
any pics would be apprecited or must a marked up diagram. thanks
2) Drilled the crankcase vent hole at the lower front right hand corner of the airbox out to 3/8". Like the KLX300, this system is plugged up and enlarging the hole helps move air out of the crankcase. It also means oil has a clear shot at your airbox if you lay the bike over.
any pics would be apprecited or must a marked up diagram. thanks
2) Drilled the crankcase vent hole at the lower front right hand corner of the airbox out to 3/8". Like the KLX300, this system is plugged up and enlarging the hole helps move air out of the crankcase. It also means oil has a clear shot at your airbox if you lay the bike over.
Junior Member
1st Gear Member
Joined: Aug 2010
Posts: 22
If I drill out the stock pipe and put some holes in the Airbox cover will I have to mess with carb? I plane on getting a new exhaust and jet kit later on, but I just don't have the funds right now and we are hitting the trails on Saturday.
Senior Member
1st Gear Member
Joined: Apr 2006
Posts: 910
1st Gear Member
Wow this thread brings back memories of when I first my KLX. I wonder how bmwhd is doing? That guy knew his stuff!
Senior Member
Joined: Oct 2006
Posts: 3,106
From: Misawa Japan
1st Gear Member
He pops into the FJR and KLX threads at Adv Rider every now and again. Seems like he's doing fine.
Junior Member
Joined: Oct 2010
Posts: 1
I have just finished putting the Jet Kit, FMF Q4 and KDX snorkel on my bike. It's like a night and day difference. I am debating changing to the 13T countershaft sprocket, but I'm afraid it will make the bike a little squirrely offroad. Anyone have any thoughts?