Where does this air hose go?
  • dplantz
    Posts:12
    Joined:Sat Apr 11, 2009 9:31 pm
    Where does this air hose go?

    by dplantz » Tue Nov 29, 2016 9:36 am

    2004 CRF250X
    Over the weekend, I pulled my tank for the first time ever, to make it easier to change out the spark plug for once.

    I found an air hose that sits right above the spark plug that I cannot figure out where it goes. I can see no connection on the tank, on the area around the head, anywhere near the carb, etc... Appears to vent out under the bike. What is/was this for?
  • Back2-2
    Posts:1148
    Joined:Tue Jan 04, 2011 3:31 pm

    by Back2-2 » Tue Nov 29, 2016 10:50 am

    You may have found the formed line from the "T" to the transmission vent ?

    Fairly small diameter 1/4" or less ?

    It could also be crank cse vent line that someone removed from the head to the air box and routed it up and around the top of the valve cover ?

    Larger diameter 5/16" or so ?

    Try to follow it back and I'm sure you will see what and where is goes.
    Neil
    Black Hills of SD
    Life without Motorcycles would just be boring, really boring
    Honda 450X. Yamaha Tracer GT900. HD Fat Boy. Triumph Bonneville. Yamaha Majesty 400. Yamaha Grizzly. Yamaha Wolverine. Yamaha TW200
  • dplantz
    Posts:12
    Joined:Sat Apr 11, 2009 9:31 pm

    by dplantz » Tue Nov 29, 2016 11:40 am

    Its is a small rubber line that has an L bend to it and just sits above the spark plug
  • Back2-2
    Posts:1148
    Joined:Tue Jan 04, 2011 3:31 pm

    by Back2-2 » Tue Nov 29, 2016 2:54 pm

    Just guessing but that sounds like the trans vent tube.
    Neil
    Black Hills of SD
    Life without Motorcycles would just be boring, really boring
    Honda 450X. Yamaha Tracer GT900. HD Fat Boy. Triumph Bonneville. Yamaha Majesty 400. Yamaha Grizzly. Yamaha Wolverine. Yamaha TW200
  • Leardriver
    Posts:462
    Joined:Wed May 05, 2010 10:33 am

    by Leardriver » Wed Nov 30, 2016 2:23 am

    Does it plug in to the top rear of the cam cover?

    I've never changed the spark plug on any of the 15 CRF's that I have owned. They last forever.

Who is online

Users browsing this forum: No registered users and 8 guests