Backfire Air Filter & Screen - Part 2
#41
05-10-2013, 07:00 PM
EFI by nature is not dependent on vacuum signal to deliver fuel into the venturi via jets exposed to the incoming air stream as there is in carbureted versions, It's preprogrammed.
Unless there's a vacuum sensor feeding info to something that would vary the amount of fuel injected, but I don't think there is on these bikes.
Taking the lid off and/or removing the screen could still lean the A/F mix outside of the parameters of the programmed EFI injected settings though of course.
Engines with any type of non-CV carby could still be somewhat dependent on any contribution the smallish opening the air box lid is making to how strong the vacuum signal/flow is over the jetting orifices in the floor of the carb.
Air scoop openings on race cars often have smallish openings in relation to the amount of power the engines are putting out.
Unless there's a vacuum sensor feeding info to something that would vary the amount of fuel injected, but I don't think there is on these bikes.
Taking the lid off and/or removing the screen could still lean the A/F mix outside of the parameters of the programmed EFI injected settings though of course.
Engines with any type of non-CV carby could still be somewhat dependent on any contribution the smallish opening the air box lid is making to how strong the vacuum signal/flow is over the jetting orifices in the floor of the carb.
Air scoop openings on race cars often have smallish openings in relation to the amount of power the engines are putting out.
oxygen sensor, air temperature sensor, air pressure sensor, throttle body assy .....
KAWASAKI KLX250
#43
07-30-2014, 06:31 AM
Went to pull my screen off and, ......................... mine is an 09 and has f$%&ing phillips screws that go through the screen housing and into the airbox. As YYY said, the lower one is a B@&%$. I tried to put a short phillips bit on the end of the long noze vise grips and decided that I will have to think on this for a while. I can just see a cheap *** screw head being rounded off. Will see if there is a better way when I have more time. Maybe the 06 and 07's have studs with nuts. The air box on the 09 looks to be two parts, making attachment of the screen housing easier durring assembly but not so on disassembly. Will let you know what I do.
Has anyone had any success with removing these, and what would be the best method. The one at the bottom is a real bitch...
My screen is getting caked up with grease from mounting the filter, and I think removal is the best option?
Thanks
#44
07-30-2014, 03:46 PM
Hey scallen, my 2011 also has the Phillips screws.
Has anyone had any success with removing these, and what would be the best method. The one at the bottom is a real bitch...
My screen is getting caked up with grease from mounting the filter, and I think removal is the best option?
Thanks
Has anyone had any success with removing these, and what would be the best method. The one at the bottom is a real bitch...
My screen is getting caked up with grease from mounting the filter, and I think removal is the best option?
Thanks
#47
07-30-2014, 11:14 PM
Various length bits and ratchet seemed to do the job, thanks for your help.
Taking off the screen and cleaning it up was a lot more work than anticipated, but oh well.
Hope to fire it up soon once I get some maintenance finished with.
Taking off the screen and cleaning it up was a lot more work than anticipated, but oh well.
Hope to fire it up soon once I get some maintenance finished with.
#48
08-02-2014, 06:01 AM
Took her for a rip tonight and I believe that this made a difference.
I always thought that I was running a little rich and this seemed to balance the problem. Better throttle response throughout.
But... could have been that my screen had a bunch of filter grease on it, or maybe the fresh nobbies I just put on......or maybe its just the new riding apparel I bought.
Either way just ride and have fun!!!!
I always thought that I was running a little rich and this seemed to balance the problem. Better throttle response throughout.
But... could have been that my screen had a bunch of filter grease on it, or maybe the fresh nobbies I just put on......or maybe its just the new riding apparel I bought.
Either way just ride and have fun!!!!
#49
08-02-2014, 06:13 PM
Ok lets see, the backfire screen stops the ah backfire from getting to the filter but does not slow the air going from the carb to the engine.
So basically the backfire screen is a one way valve.:roll eyes: I will leave mine out seeing how it was already out when I got the bike. My seat of the pants dyno mostly tells me that my KTM seat is not soft.
So basically the backfire screen is a one way valve.:roll eyes: I will leave mine out seeing how it was already out when I got the bike. My seat of the pants dyno mostly tells me that my KTM seat is not soft.
#50
08-02-2014, 07:27 PM
Ok lets see, the backfire screen stops the ah backfire from getting to the filter but does not slow the air going from the carb to the engine.
So basically the backfire screen is a one way valve.:roll eyes: I will leave mine out seeing how it was already out when I got the bike. My seat of the pants dyno mostly tells me that my KTM seat is not soft.
So basically the backfire screen is a one way valve.:roll eyes: I will leave mine out seeing how it was already out when I got the bike. My seat of the pants dyno mostly tells me that my KTM seat is not soft.