The snorkle mod?

[fake]

hey all,
I was reading about a snorkle mod done to the intake system.  Is there any truth to this?  Do you need to re-jet after doing this?  Any benifits from it?

[Daytona]

If you mess with anything in the airbox, and don't rejet (on the new Bandit) can cause a problem. About the only thing i would suggest, unless you like the super quiet exhaust is a after market one. Just a slip on won't make it run anyway but better & won't need any carb tweekin in most cases! The Yoshimura zyclone street core is a nice change. When you get to the point you need a new chain! you get what you pay for!!

[smooth operator]

I do'nt know about the 2nd generation,but I have a 98.Just pop it out and it open oup th hole abit. I did on mine befor going to the pods.I stayed away from drilling the 2"hole though. I id'nt want to ruin the stock box when I knew sooner or later I'd end up with the K&N pods.

[DaveG]

Exhaust is the first mod you should do.
just a bolt on scporpion made a huge difference to my 02B12
open the mixture screws till the popping stops and it gets even better.

i do suspect that any further increase in breathing either in or out would require rejetting.

mine does seem to run out of breath now at 10K but it gets there alot faster. also as max power is at 8K the only reason for 10 is to reach 100 in second ( 160kmph for me)

[jajo]

When I took the snorkle off my 03b12 it ran like crap. Ended up putting holeshot stage 1 jet kit and now she's running great.

[Bazza]

That snorkle does more than most people think. I installed an Ivan's jet kit on mine which instructs you to remove the snorkle. After much fine tuning I installed mine again.

I believe that the snorkle is their to create velocity in the airbox. While I have no Dyno proof, I have no doubt that the snorkle helps with low speed roll on's. Without it, my bike tends to bog in low speed roll on's.

Now with Ivan's kit you actually drill holes in the airbox. I experimented with covering some of the holes, and this did nothing to cure the bog. I also experimented with just about every screw setting one could do at 1/8 turn intervals.

Installing the snorkle improved the bog.

I would not touch the airbox without re-jetting period. Nor should you use any high flo air filters as the bandito is just too lean in stock form.

[fcbandit]

I own a 2004 Bandit (Canadian Edition). I have done some extensive experimentation with my bike and the best setting with a Yoshimura RS3 with a Zyclone baffle are:


 With the snorkel on:  main Jet: 102.5                      
        Needle: Stock with a shim of: .064mm
        Pilot screw: 3 ½ turns


Without the snorkel:  Main jet: 107.5
        Needle: Stock with a shim of: .05 mm  
        Pilot screw: 3 ½ turns

The difference between the snorkel on or removed it is the top end performance. With the snorkel on your bike will pull hard up to 8,000 rpm. Without the snorkel it will pull harder up to 9,500 rpm.  


I have tried Ivan’s jet kit with both configurations:

   Holes in the air box has recommended and snorkel removed
  Main jet 112.5
   Ivan’s needles, third clips    
  Pilot screw 3 ½  and 4 turns
   Yoshimura RS3 Zyclone
 

It was running to rich in hot weather and to lean in cold eather
I have noticed if do some extensive modification in your air box, your bike will be more sensitive the temperature changes.

Only snorkel removed
  Main jet 100
  Ivan’s needles, third clips
   Pilot screw 3 ½  and 4 turns
   Yoshimura RS3 Zyclone
 
It was slower than a stock bike, it was running lean

[Bazza]

Hey FC:

Well thanks for the confirmation. I thought perhaps I had been playing with Bandit's too long!

In reality, (Not to badmouth jet kit sellers) these kits are dialed in for the altitude and humidity where the person that throws them together lives. No doubt that Ivan or Dale can make a bike run sweet where they live, but unless you live at the same humidity & altitude (Both are near sea level) One needs to tinker.

I live at 2200 feet above sea level and I have my bike dialed in pretty perfect right now with.

Yoshi TRS Tri Oval race can on a 2002 B-12 (Also Canadian addition but I don't think there is a difference between CAN & USA bikes)

Ivan's airbox mod (With Snorkle in though)
Clips at 3rd notch (as recomended)
Screws out to 4 1/4 turns

And I added 17.5 Pilot jets from the stock 15 pilots. (Improved idle substantially)

Now the bike runs perfect here but get it up to altitudes of 4500 feet above sea level and it will run lean. I have to increase screws to 4 3/4 then.

One thing I did find when I removed my friends jet kit, and sealed up the airbox, his bike became much more wheelie prone. Much more fun to play around town with. I do know that my bike would kick it in a highway speed roll on though.

Airbox mods are kind of like robbing Peter to Pay Paul.

[fcbandit]

If you want a bike that is less sensitive to altitude or the temperature, you should stick with the snorkel removed.

I have driven my bike from freezing to hot and humid temperature. With the modified air the performance of the bike was not consistent.

At high RPM the bandit needs some air for optimal performance. If you keep the snorkel in your bike will not pull has hard at high RPM.

The very best way to fin tune your bike with the exhaust that you have is at follows:

If you have an adjustable needle you will place the clip at the highest level in order to run your bike very lean at mid range RPM.

You heat up your bike for about 15 minutes, ( it will run like a crap), then you put your bike in first gear and snap the full throttle up to the red line an see how it pops wheelies.

Increase the jet size 2.5 until you find the main jet that pops the best wheelies.

Then you adjust the needles until that you have the best mid range performance.