Rejetting After 3" Snorkle Installation - MudInMyBlood Forums
View Poll Results: Did you have to rejet after installing 3" snorkle
Did Not have to rejet after installing 3" snorkle with no additional mods 10 34.48%
Had to jet down after installing 3" snorkle with no other mods 2 6.90%
Had to jet-up after installing 3" snorkle with no other mods 6 20.69%
Had to rejet after installing 3" snorkle, however additional mods were involved. 11 37.93%
Voters: 29. You may not vote on this poll

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post #1 of 57 Old 08-28-2011, 10:49 AM Thread Starter
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Rejetting After 3" Snorkle Installation

This thread is mostly for all the carbed Brute owners but all you guys with carbed machines are welcome to post here.

A while back we went to the 3" air box snorkel because most everyone had to jet-down when they installed the 2" due to the additional restrictions.

However, there have been a few that report they did have to make some jet change after installing the 3" after all. Some had reasons that include cutting out the air box port to make it larger, or additional bends that others didn't make , turning the 90 or 45 forward into the wind, some also added full pipes and CDIs along with engine mods. These are understandable.

However, a few folks did have to re-jet that made no other changes or mods after installing the 3" snorkel. This is what we are looking to understand better.

Lets do the poll and post-up your experience. Lets hear your entire snorkel story and include any extras you might have done....and the elevation where you live and how much you had to go...either way.

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Last edited by NMKawierider; 08-28-2011 at 10:58 AM.
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post #2 of 57 Old 08-28-2011, 11:01 AM
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Interesting poll for me. I have to go to the 3" soon and this will help if I encounter problems. Right now I have glowing tail pipes and hopefully I can find someone with an exhaust gas tester before making the change and re-test afterwards. I'll be watching this one.

Should be linked to the 2 or 3" thread.

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post #3 of 57 Old 08-28-2011, 01:22 PM
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if your pipes are glowing your already to lean, moving up to a 3" will increase the airflow and thus lean the motor even more. your gonna have to move to larger jets., this will enriching the air fuel mix. and lower the temps. just keep cleaning and checking your plugs this is the best indicator of fuel mix.

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post #4 of 57 Old 08-28-2011, 01:26 PM
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My friend dis a 3" center and hmf exhaust and had to rejet. Was getting too much air. He should have pics up here of it. Hes southernbrute750

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post #5 of 57 Old 08-29-2011, 10:54 AM
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Quote:
Originally Posted by ozziestprime View Post
if your pipes are glowing your already to lean, moving up to a 3" will increase the airflow and thus lean the motor even more. your gonna have to move to larger jets., this will enriching the air fuel mix. and lower the temps. just keep cleaning and checking your plugs this is the best indicator of fuel mix.
and others here think different. I thought lean already but the Guru's say different so I'll have to experiment with snorkels.

2013 RZR LE
Bone Stock except for:
Top, Flit down split windshield, 14" Motorsports Alloy M18 rims w/ 27" MotoMax Radials.

2006 Silver Brute Some mods but for sale.
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post #6 of 57 Old 08-29-2011, 02:37 PM
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Did the 3" snorkle on my 05 brute and was getting entirly way to much air. Only other mods to affect this was my HMF untility exhaust. once it was all said and done i had to cover half or a little more than half of the intake in order for the bike to go anything higher than idle. my elevation is right at sea level or maybe 10 -20 being in southern louisiana.

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post #7 of 57 Old 08-30-2011, 10:08 AM
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Any body else have anything pertaining to this matter? im really interested as to what everyone had to do or didnt have to do when they did a 3" snork as NMK said.

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Big Gun EVO
1" spring spacers
Outlaw 2's S/W
14" SS112'S
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post #8 of 57 Old 08-30-2011, 10:24 AM
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I have the mimb set up and stock everything else . Did a stage 1 dynojet kit just like the instructions say and I'm happy for sure. Follow the directions exactly. I am in the northwest panhandle of florida and it said different settings for different levels. Don't just put in the jets though . U have to do the needles.

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post #9 of 57 Old 08-30-2011, 12:48 PM
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Quote:
Originally Posted by wcs61 View Post
and others here think different. I thought lean already but the Guru's say different so I'll have to experiment with snorkels.
Two questions wcs:
1. does the power commander remove the factory timming retard at speeds lower than 10 mph?
2. Is it backfiring out the exhaust? or out the intake possibly?

Also where are most people connecting thier snorks to the factory airbox?

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post #10 of 57 Old 08-30-2011, 12:54 PM
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Maybe the key to this is what exactly people are doing to thier stock air-boxes. Meaning are they connecting the 2or3" directly to the factory opening or are they modifying the factory opening to fit the snork pipes. It would sure make sense that leaving the factory opening alone and connecting the 3" to it should cause zero problems with air/fuel ratio's. I can see where the 2" would cause some problems because it's smaller than the stock factory opening in the air-box.

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post #11 of 57 Old 08-30-2011, 01:59 PM
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Quote:
Originally Posted by wyo58 View Post
Maybe the key to this is what exactly people are doing to thier stock air-boxes. Meaning are they connecting the 2or3" directly to the factory opening or are they modifying the factory opening to fit the snork pipes. It would sure make sense that leaving the factory opening alone and connecting the 3" to it should cause zero problems with air/fuel ratio's. I can see where the 2" would cause some problems because it's smaller than the stock factory opening in the air-box.
I didn't mess with the stock opening. Just connected my 3" rubber 90 directly to the stock opening.

2005 brute 750
Radiator racked
Big Gun EVO
1" spring spacers
Outlaw 2's S/W
14" SS112'S
2" MIMB snorkles
Almond primary/ Red secondary
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post #12 of 57 Old 08-30-2011, 02:50 PM
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I didn't mess with the stock opening. Just connected my 3" rubber 90 directly to the stock opening.

That is really strange as I said in your picture posting, should have made almost zero difference in jetting. Oh well You have it going so live and learn.

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post #13 of 57 Old 08-30-2011, 02:59 PM
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Yeah. That's the way I'm taking it Hahaha. I fi have to say I feel for my bike being carbed, throwing the 3 inch snorks on there and jetting made a pretty good difference in my throttle response.

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Radiator racked
Big Gun EVO
1" spring spacers
Outlaw 2's S/W
14" SS112'S
2" MIMB snorkles
Almond primary/ Red secondary
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post #14 of 57 Old 08-30-2011, 03:50 PM
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Quote:
Originally Posted by wyo58 View Post
Two questions wcs:
1. does the power commander remove the factory timming retard at speeds lower than 10 mph?
2. Is it backfiring out the exhaust? or out the intake possibly?

Also where are most people connecting thier snorks to the factory airbox?
As for the power commander, I haven't a clue. The previous owner installed it and I haven't researched it.

As for the hook-up I did not alter the air box at all. Here ia a photo taken during installation or re-running of the 2" snorkels. The previous owner had the side mounted snorkels and after breaking one it was time to de-Aeng. the thing.

http://i413.photobucket.com/albums/p...7/IMG_0504.jpg

Need to do something about that ugly arse exhaust pipe too!

2013 RZR LE
Bone Stock except for:
Top, Flit down split windshield, 14" Motorsports Alloy M18 rims w/ 27" MotoMax Radials.

2006 Silver Brute Some mods but for sale.
2006 Yamaha Big Bear 400. Bone stock, even the original tires and wheels.
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post #15 of 57 Old 08-30-2011, 04:18 PM
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wcs looks like a good clean installation! Is it backfiring out the exhaust or the intake?

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