Like Bug said... get the updated done first thing... talk to your dealer and get the parts on order... Polaris will NOT provide the parts alone to the consumer.. this update of new pistons/head/computer re-programming can only be done at the dealer...so get in line early.
The new Polaris sleds are VERY sensitive to backpressure. So be carefull on the exhaust mods.
Polaris will be strict with the dealers on engine warranty issues if any can but the SLP or stock on ANY of the updated 800CFi sleds or the 2010.
You could possibly have a burndown issue with a can that is more free-flowing (less backpressure)...
In a 2 stroke, tuned exhaust, the pipe/porting/can are designed as a unit. Less backpressure in a 2 stroke does NOT equal more power... in fact... in most situations it equals less power unless the entire package from the ECU thru the motor, and into the pipe are taken as a system.
The new EFi/CFi engines do not participate in the same set of "exhasts practices" as the older carbed sleds... This 800CFi in particular is one of the prime examples.
Right now, the SLP can for the 2009 sleds is about $125 thru any dealer as part of the update package thru June '10.
The shock Valving in the front Assault "Air" shocks could be adjusted a bit, but they already run the high flow pistons... not a whole lot to do there. I recommend Tri City Polaris or FasTrax Motorsports as shops that are really tuned in on the Walker shocks.
Clutching... my recomendation goes to Carls... they have a good package with tons of R&D behind it. They will get you dialed in right the first time.
A good clutch package starts, IMO, with a fully blueprinted/ballanced primary clutch.
If you read the clutch post from RON a while back you will see that the factory primary leaves a lot to be desired. I really like the work from Indy Specialties on the Primary clutch... his balance work and setting up the belt clearance (need special tools for this) are top notch. There are others that offer this service as well.
Remember... the primary clutch is the path that power makes it out of the engine to the drivetrain... it that is "off" or cant function smoothly, your sled will be "off" too.
Setting the belt deflection is another free way to make the sled perform at its peak ability.
Depending on where you live and what snow you ride in, trimming the track might not be a good idea...unless you have a turbo, IMO... DO NOT TRIM the lugs on your Assault track... It will be WAY to stiff imo to be an effective mountain track.
Track tension... and keeping it correct every ride is super important to making the sled work correctly... loose tracks, especially these new single ply tracks do not perform well in any condition compared to a properly tensioned track. When a sled has less than 1000 miles on the track... it is still taking its "set" and will stretch... thus loosening and requiring the track to be tensioned as outlined in your owners or service manual.
The track that I like the best, all around for the Assault would be the 144" Camo Extreme 2.5" (this is a 3" pitch track) using the Avid 7 tooth combo drivers for more tunnel clearance at the top/front. As a note, I am not confusing this with the 146" Camo Extreme 2.86" pitch track that is available and must use the larger 8 tooth drivers that give less clearance in the tunnel.
IMO, Stock Polaris 2.4" tall tracks already have too little clearance in the tunnel.
Less clearance in the tunnel creates parasitic drag that could sap upwards of 20 - 30 hp from your sled depending on the snow conditions. This drag also makes the clutches less efficient and prone to heating up.
Like Bug/Fynn said... the Power Commder controller with the slp Mapping AND the SLP pipe/can really wakes the 800 CFi up.
Also, the Std 2010 Timbersled Mountain Tamer with the FitKit for the stock rails, with Fox Float 2 on the skis would be about $2300 shipped from Timbersled...
There are dealers on this forum that can probably offer discount pricing on much of the items you will need.
lol
