Maintenance & Technical > KX500 Original

What are the holes on the side of the air box for on the KX500?

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grywache:
I wondered the same thing and noticed when I had a larger main jet if the air box doors were closed it would not run good, only if they were both fully open would the bike run properly. then I changed it to a smaller main jet due to the new elevation that I am at and the bike runs perfect with them both open, but I haven't tried it with them closed yet. I was just searching on the internet and found a little info about testing your jetting with the air box opening.

http://www.thumpertalk.com/forum/archive/index.php/t-789167.html
"
The original main jet is too large (rich at WOT): Testing with the airbox door off will lean the air/fuel mixture closer to ideal and the bike will run better than with the airbox door on. Reduce main jet size and retest.

The original main jet is too small (lean at WOT): Testing with the airbox door off will lean the air/fuel mixture even more and the bike will run worse than with the airbox door on. Testing with the airbox opening restricted will richen air/fuel mixture closure to ideal and the bike will run better than non-restricted. Increase main jet size and retest.

The original main jet is just right (ideal air/fuel mix at WOT): Testing with the airbox door off will lean the air/fuel mixture from ideal and the bike will run worse than with the airbox door on. Testing with the airbox opening restricted will richen the air/fuel mixture from ideal and the bike will run worse than non-restricted. Main jet size is correct. Now go find the ideal jet needle position and read the sticky on confirming your pilot circuit. "

So by the sounds of it the holes on the side of the air box allow you to adjust the air/fuel mixture slightly.

kawi4ever:
I also use the air box holes for slightly leaning the airfuel mixture, if its nice outside i usually leave them open but if its wet and muddy i keep them closed. Don't notice any seat of the pants difference open or closed but you could tell your friends it adds 10 to 20 HP and its a KX500 secret..LMAO   :evil:

Motorrad:

--- Quote from: kawi4ever on March 24, 2010, 03:33:12 PM ---I also use the air box holes for slightly leaning the airfuel mixture, if its nice outside i usually leave them open but if its wet and muddy i keep them closed. Don't notice any seat of the pants difference open or closed but you could tell your friends it adds 10 to 20 HP and its a KX500 secret..LMAO   :evil:

--- End quote ---

you must have trick aftermarket billett ones, my stockers only add 5hp. ;)

Friar-Tuck:
KX 500 E12 (2000)
Owners Manual Page 10.
   Air Cleaner Rotary Shutter
A rotary shutter is equipped to the left and right side sides of the air cleaner case respectively.
  When the shutter is opened, extra air is led to the air cleaner case,so more efficient intake is obtained.
    NOTE
The rotary shutter should be closed in wet conditions to prevent rain from entering.


 Tuck\o/

Polar-Bus:
I always thought that door was to let the mice in and out during winter storage.  :-D

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