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How to change and upgrade your Reed Valves

Snowmobile How-To's

 
 
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  #1  
Old 09-22-2008
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Default How to change and upgrade your Reed Valves

This reed change will be done on a Stock 2003 Polaris 700 Edge X (Polaris Liberty engine)
I will be changing the stock reeds out for the VForce reeds.

Reeds are a one-way valve, located downstream from your carbs and mounted in the crankcase.
These reed valves are integral to the design of the motor. You will want to make certain that your reeds are in top working condition. If their not you will have a poor running sled at slow speeds and your motor will not generate the top end power that it once did.

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This is a picture of the airbox, carbs, reed valves and cylinders


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This is a close up of the stock reeds
To inspect or replace the reeds you'll first need to remove them from the cases and this is done by removing the air box, carbs and then the reeds themselves.

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This is a picture of the reeds removed from the engine.
The reed valves are a one-way petal valve that allows the motor to breathe through the petals when it is drawing in the air/fuel mixture from the carbs. When the motor moves to compression stroke the pressure that is created in the case will force the reeds back against the reed blocks forcing them to seal and thus holding the intake charge in the crankcase so it can be pushed into the cylinders.


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In this picture you can see the difference between the stock Polaris reeds (Left) that have been removed and the new VForce (right) reeds that are going to be installed. Notice that the VForce reed cage have twice as many reed petals, in a W formation, as opposed to the stock Polaris reeds.


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Here's another picture showing the difference between the Stock Polaris and the VForce reed cages. Note that the VForce reeds have no little screws on them to shake loose and go flying though the motor and damage it. They are also made from a composite material.

Inspecting the reeds is quite easy. Make sure there are no chips or cracks in reed petals and that the reeds are seated or almost seated against the reed blocks.

Installation is simply reverse of removal. Place the reeds back in the crankcase with new gaskets, the carb boots and carbs. Don't forget to connect the throttle, choke and any oil lines and airbox. Be sure that the airbox seats to the carbs.
I would give this Job a difficulty rating of 2.5 out of 5 just due to having to remove the carbs.
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  #2  
Old 09-23-2008
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Oh, thanks rich. I will need this soon. I have some reeds I am going to install(if they are the right ones). Is there jetting needed? Because I might need a how to on that then!
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  #3  
Old 09-23-2008
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Should not need to jet for new reeds.
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  #4  
Old 09-23-2008
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Let me put it this way Harry, you shouldn't have to re-jet your sled but you may have to tweek your air/fuel mixture screws on the side of the carbs. When you change to a VForce reed cage you are richening out the Air/fuel mixture a little bit. This is due to the better air flo design that VForce has been known for! This new rich mixture can cause a slight stumbling at low RPM and or at takeoff but like I said before "just tweek the fuel/air screws and your all set! Or you may just have to go down one jet size!

Last edited by PolarisRich : 09-26-2008 at 06:05 PM.
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  #5  
Old 09-23-2008
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I have Boyesen reeds though....
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  #6  
Old 09-23-2008
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Same differance!!!!
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  #7  
Old 09-26-2008
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are there any real world advantages to v-force reeds?
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then I'll be busy fingering myself on Saturday with my in-tact fingers, thank you.
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  #8  
Old 09-26-2008
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really not on a stock sled, maybe a little crisper throttle response... and actually the V-force tend to richen the mixture rich ;) since there is no more air getting into then what that carb allows...
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  #9  
Old 09-26-2008
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does anyone run a boost botle and is there any advantage there?
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  #10  
Old 09-26-2008
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i run a boost bottle on mine, can't really tell a defference. supposedly it's supposed to equalize the airflow or pressure between the carbs to increase low end throttle response...
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  #11  
Old 09-26-2008
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i know I want the clutch kit and then maybe have you guys adj the carbs some.....runs really rich(still have stock jets in).
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  #12  
Old 09-26-2008
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that has the mikuni's? i believe they go in increments of 10 right?

were is it rich? bottom end?
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  #13  
Old 09-26-2008
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real fat at the bottom....carbs load up when it idles for a few minutes.
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  #14  
Old 09-26-2008
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smaller pilots, maybe a main, and could get leaner needles if the pilot doesn't clean it up
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  #15  
Old 09-26-2008
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I will leave the technical shit to you and your dad, when it comes to tuning a sled I know very little.
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  #16  
Old 09-26-2008
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oh we'll make sure that after a 1/4 mile the twin will be a head of the storm
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  #17  
Old 09-26-2008
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oh we'll make sure that after a 1/4 mile the twin will be a head of the storm
That was aimed at me! I am happy I am the one to beat now!
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  #18  
Old 09-26-2008
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well your the only triple rider i can think of that would be at the UP trip lol
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  #19  
Old 09-26-2008
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Lets have a "looky" at that 700 Glen!! But remember one thing, when MX and I get into that motor compartment, we are surgeon's at work!! Just bring up some smaller mains and pilot jets, and let the surgery begin!!!
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  #20  
Old 09-26-2008
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Quote:
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well your the only triple rider i can think of that would be at the UP trip lol
Isnt Jeff going to come?
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rihanna shut up and drive, I would split her in half as part of my equal opportunity bed.
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I don't take meds.
This forum is cheaper.
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  #21  
Old 09-26-2008
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He called me today, he says he is now, but might be riding a secret weapon.... it started with the word fusion... and end'ed in being powered by a TWIN...


TWINS RULE!!
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  #22  
Old 09-26-2008
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No it wont. I know all about it. You are clueless.
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My drinking team has a snowmobiling problem...


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rihanna shut up and drive, I would split her in half as part of my equal opportunity bed.
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I don't take meds.
This forum is cheaper.
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  #23  
Old 09-26-2008
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really? i told him that XLT and Ultra will get him a long ways in the pow :p
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  #24  
Old 09-26-2008
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It has nothing to do with those sleds...
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My drinking team has a snowmobiling problem...


​I am one gun away from happy!!

Quote:
Originally Posted by Madcow View Post
rihanna shut up and drive, I would split her in half as part of my equal opportunity bed.
Quote:
Originally Posted by RipnChick View Post
I don't take meds.
This forum is cheaper.
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  #25  
Old 09-27-2008
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Damn MX, better get me a "Sno-Bungie" for X-Mas, appears Jeff is going to need to be pulled out like another Ultra we know, and he's even long tracked!! As for the Boyseens Harry, have any problem with cracking in Cold weather, they are plastic correct? I have a set of the V-Force on my sled, with the boost bottle, and it definitely cleaned up the bottom end, momma doesn't have a boost bottle on her sled, and I can certainly tell the difference. Rock, you going to be able to make it up here on the 1st Snow fall? A bit over 3 hours from your place in St Paul Park, we have a excellent 1/4 strip for you to test the results, and if you don't like that, we can go over to a crop dusters old air strip!!
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