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.
This is a picture of the airbox, carbs, reed valves and cylinders
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.
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.
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.
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.
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.
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...
Originally Posted by RipnChick
She was a fat girl, of course she did.
she was all hongry and shit.
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!!!
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!!