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Author Topic: Which Jets?  (Read 5175 times)

Offline BoisBlancBoy

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Which Jets?
« on: May 12, 2008, 04:23:05 PM »
Hey hello everyone!  New guy here with some jet questions, which I think I pretty much have figured out already.

I have a 2005 Raptor 350.  Just bought a HMF Slip-on Exhaust and a Mod Quad K&N Intake/Filter, with outerwear and my elevation is 600-700ft.

Which jets am I going to need?

I have been told already that I will probably need a 155 mikuni Main Jet and a 25 Pilot jet.  I have also been told that I dont need pilot jets, but being knew to this aspect I am trying to get all the info possible cause I want to do it right the first time.


Thanks!  Great site!
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Offline Flynbyu

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Re: Which Jets?
« Reply #1 on: May 12, 2008, 04:33:19 PM »
Welcome aboard.

Pilot jet controls fuel delivery to half throttle. Bumping the factory 22.5 to a 25 will help with low end.

I jetted my neighbor's bike like the settings I emailed you and it runs really well.

~Brian
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2003 Yamaha Raptor





Yamaha Raptor Forum

Offline BoisBlancBoy

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Re: Which Jets?
« Reply #2 on: May 12, 2008, 05:32:17 PM »
Alright great!! Thanks for the info!

I found a site  jetsrus.com and they have some pretty good instrustion on jetting and tuning.  Also I plan on buying my jets from there, would you recommend that?
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Offline Flynbyu

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Re: Which Jets?
« Reply #3 on: May 12, 2008, 05:44:15 PM »
Quote from: BoisBlancBoy on May 12, 2008, 05:32:17 PM
Alright great!! Thanks for the info!

I found a site  jetsrus.com and they have some pretty good instrustion on jetting and tuning.  Also I plan on buying my jets from there, would you recommend that?

Your local dealer may have them. Be sure to check there first, you'll save on shipping. Total cost around $8.

~Brian
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Offline BoisBlancBoy

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Re: Which Jets?
« Reply #4 on: May 12, 2008, 05:48:18 PM »
Thanks for the help!  Well I hope after all this I notice some difference!  I did get some Maxxis razrs too, thought it was time to upgrade my from stock dunlops!
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Offline Flynbyu

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Re: Which Jets?
« Reply #5 on: May 12, 2008, 05:49:42 PM »
Quote from: BoisBlancBoy on May 12, 2008, 05:48:18 PM
Thanks for the help!  Well I hope after all this I notice some difference!  I did get some Maxxis razrs too, thought it was time to upgrade my from stock dunlops!

Another mod you may try is drop a tooth on the front sprocket.

It will give it a bit of low end power!

~Brian
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Offline BoisBlancBoy

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Re: Which Jets?
« Reply #6 on: May 12, 2008, 06:15:59 PM »
Yeah I was thinking of doing that.  I want to test out the difference with the exhaust and intake first.  If I do that I am hoping for some decent power to get up for wheelies a bit better, its gotta help I would think.
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Offline Flynbyu

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Re: Which Jets?
« Reply #7 on: May 12, 2008, 06:18:02 PM »
Quote from: BoisBlancBoy on May 12, 2008, 06:15:59 PM
Yeah I was thinking of doing that.  I want to test out the difference with the exhaust and intake first.  If I do that I am hoping for some decent power to get up for wheelies a bit better, its gotta help I would think.

The sprocket will make a huge difference. For $20, you can't beat it!

~Brian
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Offline BoisBlancBoy

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Re: Which Jets?
« Reply #8 on: May 12, 2008, 06:20:30 PM »
Besides a dealer, where online can I get sprockets?
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Offline Colorado700R

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Re: Which Jets?
« Reply #9 on: May 12, 2008, 06:49:34 PM »
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Offline BoisBlancBoy

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Re: Which Jets?
« Reply #10 on: May 12, 2008, 07:35:20 PM »
Anyone happen to know what you actually loose for top end going down to a 12T?
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Offline Flynbyu

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Re: Which Jets?
« Reply #11 on: May 12, 2008, 09:31:22 PM »
Yes, you'll loose a little top end.

~Brian
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Offline BoisBlancBoy

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Re: Which Jets?
« Reply #12 on: May 13, 2008, 05:24:10 AM »
 :lol:  I know I will loose some top end, I was wondering if anyone knows how many mph's I will loose?
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Offline Flynbyu

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Re: Which Jets?
« Reply #13 on: May 13, 2008, 06:46:26 AM »
Quote from: BoisBlancBoy on May 13, 2008, 05:24:10 AM
:lol:  I know I will loose some top end, I was wondering if anyone knows how many mph's I will loose?

Approximately 3mph.

~Brian
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Offline BoisBlancBoy

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Re: Which Jets?
« Reply #14 on: May 13, 2008, 04:41:24 PM »
Oh big deal!!  Well even if I dont like it, easy enough to change back at that price!
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