Air box mods

[Grinder]

Has anybody modified the stock air boxes to get more air flowing? Mine just have some holes in the back to let the air in(77), seems pretty restrictive.

 

[blue900]

Yes I have, xsJohn showed us how. Here"s the post from 650 rider. I don't see the picture and I dont have one but just copy the ones there and add another to let in more air in of center near the one of the others on my 81 anyway.
http://650rider.com/index.php?name=Forums&file=viewtopic&p=23199#23199

 

[Grinder]

So you just drilled more holes in the box?

 

[aldo5468]

So you just drilled more holes in the box?

No. To do the XSJohn method, start with some straight 1" inch ID radiator hose. Cut a section long enough to fit inside the air box, centered between the two existing inlet tubes, allowing for approx. 1/8" to protrude outside the box, like the existing inlet tubes. This new tube will be a bit shorter than the two existing ones to clear the molded ribbing inside the air box. Use a Dremel with small round bit or a round hand file to grind a narrow, shallow groove around the circumference of the hose about 1/4" in from one end - this creates the means to "lock" the new tube into the box. Then create an oval-shaped hole centered between the existing inlets - file carefully by hand after roughing it in so it is just large enough to grip the new tube tightly in the groove. This takes a little time but is easy to do.

 

[nj1639]

You outta try xsjohns throttle improvement too, nice!

 

[Grinder]

I was confused until I looked at an air box from a later model XS. The older boxes look nothing like the newer version. The 77 version just has about 10 3/8 holes in the back of the box to let air in. This is the box to which John's mod is directed I think.



http://cgi.ebay.com/ebaymotors/ws/e...5ffcf2770&rvr_id=&ua=WVI7&itemid=230450671985

Here's the older version


http://cgi.ebay.com/ebaymotors/ws/e...5ffcf2770&rvr_id=&ua=WVI7&itemid=120258236510

 

[gggGary]

yeah that old box had a foam noise reduction? element in that area too. I just poured the remains of that foam out of a 77 airbox last night. Should have taken a picture, it just turned to dust when I touched it.

 

[gggGary]

Was thinking these might make a good replacement for the airbox.
Flea bay Item number: 300399153705 haven't measured to see how they would fit yet.