Intake Mod

[Ryan Stanley]

Sorry everyone, I've been posting many, many questions. This is my first bike, so I'm still learning much...

But here's another one:

I just finished removing the air intake assembly and replacing it with four aftermarket cone-shaped filters. Removal of the old intake proved to be unpleasant to say the least, but the new ones were a breeze to install.

However, what the hell do I do with the crankcase breather hose? Right now it's just hanging there, but I wasn't sure if it needs to be connected to the intake for any reason.

Also, are any carb adjustments necessary after changing an intake? Anything else I should know about?

[oldyam80sg]

K & N makes a crankcase breather filter that goes on the end of that hose.

[bikerphil]

breather

The crankcase breather hose should not be plugged off, it should be run to a small breather filter like this one....





As for carb modifications, read this...

http://xs11.com/forum/showthread.php?s=&threadid=382

[oldyam80sg]

Here is mine

[jjwaller]

AS oldyam said, some kind of filter on the end of the hose, (fuel filter works fine) to keep the bugs out.

You will most assuredely need to rejet as the additional air will severely lean out your mixture. CV carbs are also touchy to back pressure. Less restriction on intake equals less suction to pull fuel from carbs.
Many people have done it successfully(they say) but many still have problems at certain points of the engine range. i.e. doesn't idle right but top end is great or idles fine but midrange is crap or on and on.
Good luck.
Me? I stay stock. Runs great everywhere!

[Ryan Stanley]

Hmmm...so how bad is it to run it without a breather hose filter? *looks nervous*

[oldyam80sg]

You might get some crap-meaning light oily smoke coming out.I personally wouldn't run it open.You wouldn't want something to get in there.Take the hose off and go to an auto parts store.A lot of Autozones and places like those carry stuff like that.

[trbig]

I wouldn't go cross country with it or ride it in the rain like that, but it isn't like running without air filters for your carbs. Just get one when you can.

There are a lot of threads showing that the cheap pod filters that are out there will close off some of the air ports. If the filter boot is wide, then narrows down to allow the actual filter to snap into a groove on the boot... you will have a really hard time getting these to work. What you want is for a filter boot to be the same size opening all the way through to the filter.

Some people have to re-jet. I don't think that these allow any more air really than a stock air box drilled full of holes.. but that's just my opinion. I went up one size on the main jets.. but probably didn't have to. Everything else is the same in the carbs.


Tod

[Ryan Stanley]

Whoops. Well unfortunately my bike is my ride to work at 5:00 tomorrow morning, and, since I live in a small town, pretty much everything in town is closed already except for Wal-Mart.

Guess I should have thought about this ahead of time...

Any ideas?

[Ryan Stanley]

These are the ones I put on:

http://www.babbittsonline.com/pages/...r-filters.aspx

[oldyam80sg]

Zip tie the hose to the frame if it is long enough.Don't pinch it off though.

[tarzan]

I think those might be the ones that block the passages.Just take a filter of the rubber and see if the rubber covers the holes.
If it runs ok,I would ride it to work tomorrow if I were you.Just get a filter on the breather soon.

[trbig]

They do look like the problem filters. If they snap on like this...






Here's the difference of what I was talking about. Notice the openings.. not necessarily the shape.





This is the carb opening.. notice the air inlet jets around the bell..





And this is the boot installed without the filter element. Notice all the jets it is closing off. Center carb..





There is a way to make some velocity stacks to attach those to and make them work acording to T.C. I don't know where that link is though.

Good luck.

Tod

[Ryan Stanley]

Ah, I see what you mean. That's very helpful. I'm not sure if they are the problem ones or not. I'm too exhausted tonight to mess with the bike any more, but I'll take a look at them tomorrow.

For now, the bike seems to be running fine, so I'm sure it'll get me to work. at least.

[Yahman]

They work great if you do it like this.





Larry