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Old May 29th, 2009, 01:09 PM   #41
Mo1981
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Man, I finally got around to doing this mod on my lunch break today. I'm quite surprised how it opened up the top end for me. Throttle response has smoothed over. I've know about the mod, I've just been worried about water getting in.
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Old May 29th, 2009, 01:41 PM   #42
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Matt,

Have you done any jetting or exhaust mods?
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Old May 29th, 2009, 02:17 PM   #43
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I've got the D&D slip-on and two washers.
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Old May 29th, 2009, 02:55 PM   #44
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Cool... it should run about perfect.

If you ever feel the need, though, you could try putting a third shim in there to see if it helps out even more. But first, spend some time as you have it now so you can get a good feel of what the bike does and doesn't do before you make any more changes.
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Old June 1st, 2009, 09:52 AM   #45
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Thanks for the input, Kelly. I will probably start tinkering with the shims again soon.
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Old June 11th, 2009, 08:42 PM   #46
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Did this after I shimmed my carb needles while I still had all my body work off. Can't really notice any difference yet as I haven't taken it out for a ride.
It was very difficult for me to push the snorkel out so I had get a screwdriver to pry it a little before I got it out (made sure to cover parts with towels and such so nothing was scratched, no worries !)
Managed to finally get it out, but I can't say it's worth it quite yet, as I have yet to see what effect it has on my bike.
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Old June 12th, 2009, 05:53 AM   #47
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Can't really notice any difference yet as I haven't taken it out for a ride.
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Old June 15th, 2009, 11:26 PM   #48
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Is there any danger of water getting at the air intake after taking the snorkel off? Vancouver is *very* rainy, and I'm commuting on this bike, so I don't want to do this mod if it could damage things. Also, how much of a difference in mpg is there after removing the snorkel?
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Old June 15th, 2009, 11:50 PM   #49
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if you submerge the bike so that water fills the airbox from the intake hole, you'll have a problem... you would also have the same problem with the snorkel in place at that depth.

roughly a 10% reduction in fuel economy.... depends how much you twist the throttle.
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Old June 16th, 2009, 10:02 AM   #50
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Interestingly enough, after removing the snorkel and putting in the Dynojet needles, I haven't seen a reduction in fuel economy. And believe me, I'm twisting the throttle more
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Old June 16th, 2009, 10:30 AM   #51
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Interestingly enough, after removing the snorkel and putting in the Dynojet needles, I haven't seen a reduction in fuel economy. And believe me, I'm twisting the throttle more
That may have something to do with the fact that because the bike runs better at mid throttle with the mods that you've done you no longer need to get as deep into the throttle as you used to to get to the same place in the engine's power band.
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Old June 16th, 2009, 10:34 AM   #52
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Quote:
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if you submerge the bike so that water fills the airbox from the intake hole, you'll have a problem... you would also have the same problem with the snorkel in place at that depth.
Fair enough. I saw it mentioned and just wanted to ensure that it wasn't a worry
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Old June 19th, 2009, 09:29 AM   #53
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hmm.. can someone do a video on jetting and shimming?
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Old June 19th, 2009, 11:59 AM   #54
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hmm.. can someone do a video on jetting and shimming?
Do you really think someone is going to make a 2 hour video on jetting haha ?
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Old August 24th, 2009, 06:57 PM   #55
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Great little mod, wish I would have known it was that easy. One quick question, So looking at one of the picures posted it looks like the air filter you pulled is just a prefilter. Is there another one in the airbox or is that just a screen?
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Old August 24th, 2009, 07:21 PM   #56
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Yes, that is the foam air filter for the bike. There is a metal screen after that towards he carbs, but I think it's there for backfire protection
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Old August 24th, 2009, 09:55 PM   #57
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What do you just wash it with gas or something when its dirty? Like a lawn mower filter.
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Old August 24th, 2009, 10:37 PM   #58
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exactly the same. reoil after it's clean and dry.
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Old August 25th, 2009, 07:44 PM   #59
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Just did mine.....Piece of cake!
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Old August 25th, 2009, 07:51 PM   #60
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Just did mine.....Piece of cake!
did you already shim your needles?
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Old August 28th, 2009, 03:04 AM   #61
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If I do this mod and I don't like the result, can i put it back without problems? Will i need to apply glue on it?
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Old August 30th, 2009, 10:23 AM   #62
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I just wanted to add my experience with this mod for anyone that is thinking about doing it. I mostly ride between 4600 and 10500 feet above sea level and while the bike felt decent for a 250 down near the bottom of that range it was definitely struggling at the top. I went on a ride with some co-workers a couple weeks after I bought the bike and our trip to Wyoming and back had us up to an altitude of 10000 feet at one point and my poor little Ninja would not accelerate past 50 mph.

When I returned from my ride I found this forum and this DIY and I decided to pull the snorkel to see if it would lean the bike out enough to help any. I did notice a small but positive difference in acceleration and throttle response down in the valley, but i noticed the biggest difference the first time I headed up the canyon. The bike no longer felt like it was going to die when I accelerated out of a corner at higher altitudes and I was able to accelerate past 50 mph without any problems.

I decided this was a good first mod because it is completely reversible. Other's may feel differently but I wouldn't worry about using any adhesive when re-installing the snorkel, it seems to fit pretty tight.
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Old August 30th, 2009, 10:28 AM   #63
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yes, this mod opens up the top end. you may now be a bit lean it the midrange/bottom end. I would recommend you try shimming to richen up the low/mid a bit for a bit more power from a stop and a bit more oomph in the low-midrange.
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Old August 30th, 2009, 10:41 AM   #64
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I decided this was a good first mod because it is completely reversible. Other's may feel differently but I wouldn't worry about using any adhesive when re-installing the snorkel, it seems to fit pretty tight.
Having reinstalled my snorkel, I will vouch that it does not need any adhesive. It is a lot harder to install than remove!
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Old August 30th, 2009, 03:13 PM   #65
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Quote:
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yes, this mod opens up the top end. you may now be a bit lean it the midrange/bottom end. I would recommend you try shimming to richen up the low/mid a bit for a bit more power from a stop and a bit more oomph in the low-midrange.
I wish I would have taken a little more time to try some shimming and jetting changes to see what I could do with the stock airbox and the snorkel removed so I could provide some more feedback on that setup. I think some shimming after removing the snorkel would have improved things even more.

Last weekend I finally got the time to replace the airbox with some pod filters and try some shimming and jetting. It has made quite a noticeable difference for me over stock jetting and a removed snorkel. I will post my findings in the jetting thread once I get my exhaust installed later this week.
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Old August 30th, 2009, 05:24 PM   #66
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Thanks, Clint. That would be appreciated.
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Old September 1st, 2009, 04:43 PM   #67
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Quote:
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did you already shim your needles?
Yeah I have two washers on both carbs. I think it woke the bike up some. It absolutly sounds better. I rode for about two weeks with just the shims, seemed a little rich, now it is getting more air with snorkle removed, I think? Maybe it is all in my head So now with the air/fuel ratio relatively the same it runs and ride real good. Next mod will be the 15T sprocket.

So at what point can I remove the whole air box? Can I just add more washers? How many washers is too many? Maybe someone with more smarts can come up with a flow chart showing what things are needed with what mod. For example!!!

1 washer good with no mod for smoother/better start up
2 washers good with snorkle removed
3 washers good with high flow aftermarket air filter
4 washers good with airbox removed/filter pod installed

Do you smell what a10forwar is cookin?
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Old September 1st, 2009, 05:04 PM   #68
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http://www.ninjette.org/forums/showthread.php?t=9465&
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Old September 6th, 2009, 08:55 AM   #69
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You the man!!
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Old September 14th, 2009, 12:06 PM   #70
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After reading this thread, I wanted to share my experience so far.

I went over a 7kft+ pass on one fun ride, and my bike was acting like there was a subtle, random cut in power at WOT in 5th and 6th. It wouldn't maintain 60mph going up relatively gentle uphill climbs. Acted gutless. I had to downshift to 4th sometimes to maintain velocity.

The next day before my other long ride, I removed the snorkel. I went over Mirror Lake Highway at over 11kft, and the bike was much better. I still had to downshift to 5th to get good climbing power, but there wasn't that bogging feeling anymore, and it would cruise WOT in 6th without random cutting. Once I got over the pass and took a break at the bottom, the only thing that needed tweaking was the idle speed, as it climbed to about 2k instead of the normal 1250 I have it set at. The bottom end feels fine and the upper end extended the shift point from about 10k to 11k for me. Throttle response is perfect.

In Evanston, my base altitude is 7,000 feet, so the bike probably runs rich with the snorkel and pretty close to perfect (by feel) with it removed. I am going to check the plugs as part of my 600 mile service and see how the color is post-snorkel mountain blasting.
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Old September 14th, 2009, 12:25 PM   #71
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Jason... have you done anything to the carbs along w/ the snorkel removal?
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Old September 14th, 2009, 05:38 PM   #72
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Quote:
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The next day before my other long ride, I removed the snorkel. I went over Mirror Lake Highway at over 11kft, and the bike was much better. I still had to downshift to 5th to get good climbing power, but there wasn't that bogging feeling anymore, and it would cruise WOT in 6th without random cutting. Once I got over the pass and took a break at the bottom, the only thing that needed tweaking was the idle speed, as it climbed to about 2k instead of the normal 1250 I have it set at. The bottom end feels fine and the upper end extended the shift point from about 10k to 11k for me. Throttle response is perfect.
That's kinda funny, the Mirror Lake Highway is exactly where I was riding when I first noticed my bike had the same problems you were describing...I can't wait to get back up there now that I have everything tuned up a bit better

Just pulling the snorkel helped me at higher altitudes too and I was quite pleased with the bike, but now that I have done a few more things I don't know that I could go back to just removing the snorkel. If you are considering removing the airbox or rejetting/shimming/adjusting the pilot screws on the carb I would highly recommend it, my bike runs a lot better now that I have...If that's not something you want to do then removing the snorkel is a great way to get some high altitude performance, and best of all it's free!
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Old September 15th, 2009, 04:36 PM   #73
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Kelly,

I have not adjusted the carbs at all. I simply removed the snorkel with positive effects. I'm not planning on adjusting anything else until I save up for my AreaP exhaust. That will probably end up being around when the snow melts in the spring.

Clint,

I guessed that 150 was the route you took earlier. Perhaps a Ninjette meet/cruise is in order in Utah some day.
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Old September 15th, 2009, 04:39 PM   #74
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must have something to do with the altitude you guys are at. most times if no carbs adjustments are done w/ the snorkel pulled, the midrange gets a bit lean and will surge at highway speeds when using a steady throttle opening. good to know it works well in your case w/o having to fiddle with the carbs.
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Old October 11th, 2009, 11:58 PM   #75
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I FINALLY tried this mod this weekend, and while I am still in the "testing phase," it does seem to suddenly suck in the mid range. I'm not sure if there is an improvement high or low yet, as I am still adjusting to the new sound, which may affect the perception of power (like smell does to taste). I do have 2 washers under each needle, so I wonder if I should add a 3rd.... does that sound reasonable?

Since I have tomorrow off, I was planning on drilling the slides too. I know there is no relation between these two mods, but I have noticed that when I try to turn on the power, it spools up like a jet engine.... that is after several commitee meetings and a majority vote. I'm lookin to rectify this too.
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Old December 27th, 2009, 12:28 PM   #76
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Pictures not working for anyone else?
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Old December 27th, 2009, 12:40 PM   #77
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I just created an album with the pictures. Unfortunately, I can't edit the original post to include them. Hope this helps.



http://picasaweb.google.com/kkim993/Snorkel#
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Old May 29th, 2010, 06:41 PM   #78
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I broke down and bought a K&N panel air filter and installed it today. While I had the side panel off, I also removed the snorkel (again). It's a fact that the snorkel can be removed without removing the right rear fairing!
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Old August 31st, 2010, 06:59 PM   #79
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kkim, do you think if you drilled holes with a small spade bit on the sides of the snorkel that it would have the same effect as completely removing it?
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Old August 31st, 2010, 07:14 PM   #80
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pulled the snorkel out on the wife's bike the other day and found a sharpie stick in it! wtf! lol
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