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In no real order here is a list of changes for the M8 sleds:
TCL:
Same thickness on both sides of TCL.
Added relief to radius of webbing.
Increased thickness of webbing.
Engine base plate is now 2 pieces, Plate is also thinner.
Exhaust side belly pan:
Increased exhaust resonator clearance.
Redesigned muffler outlet seal with less rivets and better seal contact.
Air boot Extension:
Longer boot to eliminate the need for a foam seal into the hood.
Also a longer seam to help strengthen.
Airbox seal:
Foam seal is removed for 2013 and the rubber seal is improved.
Oil tank filler neck is now shorter and more vertical. This allows for
better venting through the cap.
Cable tie added to keep oil line from getting pinched while installing the muffler.
Clearance on pipe heat shield for the duct work that brings cool air to the drive clutch and driven pulley.
Now has a hose on the fitting of the coolant filler neck that routes the overflowed fluid out of the engine compartment.
HCR and M8 Limited:
Light weight brake disk 0.9 lbs. lighter than standard disc.
New 1 piece design heat exchanger:. Ice scratchers will be required in hard pack conditions.
103 lb. drive clutch engagement spring rate, produces a smoother
belt engagement at 2800 rpm (p/n 0646-252)
All models that do not come with a larger tunnel storage bag,
comes with a belt storage bag.
On the bottom of the dash air intakes:
New FrogSkinz design for better adhesion. They are cut differently
in the corners to lay flatter and not wrinkle.
Tie rod location moved forward 0.625” for tighter turning radius.
Spindle machined to allow clearance for the sharper turn.
The option of choosing multiple tie rod locations has been omitted.
Ski stance changed to a narrower 38” stance.
HCR 800 Remains 42”
Steering range is 17.5% wider at the same degree of handlebar
throw. Steering effort is increased but still less than the old M.
No drive clutch fan on any model for 2013.
Tri-hub wheel Will be all plastic like the ProCross Models.
Track remains 3.0 Pitch. Lug Height Changes from 2.25” to 2.6”.
85 Duro on HCR Only.
Driven shaft is now shot peened to prevent from being fractured.
Increased control for the ID to OD of the bushings in the drive
clutch to keep them from moving.
Driven clutch movable Sheave bearing changed from a DU bearing to a Vespel Bearing.
Because of the heavy loads and high temperatures seen with
mountain riding and boondocking, a drive belt was developed to
better suit this riding style.
Spacer added to keep the drive belt from bottoming out in the driven
pulley.
New material for driven clutch rollers
Left Hand belly pan:
Pocket added for side panel to fit securely. Less snow ingestion and adds strength to the side panel to help against touching the drive clutch during aggressive riding.
Screen changed to a tighter grid to prevent snow ingestion through the air ducting.
A thumb screw and speed nut is now used to keep the side panel
from flexing and allowing snow in.
Added support to cooling duct, behind screen area and also to aid with a tighter fit when the left hand side panel is closed.
Clutch Alignment is now 1.450. Use alignment bar (p/n 0644-588)
New procedure during assembly of the driven shaft and locking collar.
TCL:
Same thickness on both sides of TCL.
Added relief to radius of webbing.
Increased thickness of webbing.
Engine base plate is now 2 pieces, Plate is also thinner.
Exhaust side belly pan:
Increased exhaust resonator clearance.
Redesigned muffler outlet seal with less rivets and better seal contact.
Air boot Extension:
Longer boot to eliminate the need for a foam seal into the hood.
Also a longer seam to help strengthen.
Airbox seal:
Foam seal is removed for 2013 and the rubber seal is improved.
Oil tank filler neck is now shorter and more vertical. This allows for
better venting through the cap.
Cable tie added to keep oil line from getting pinched while installing the muffler.
Clearance on pipe heat shield for the duct work that brings cool air to the drive clutch and driven pulley.
Now has a hose on the fitting of the coolant filler neck that routes the overflowed fluid out of the engine compartment.
HCR and M8 Limited:
Light weight brake disk 0.9 lbs. lighter than standard disc.
New 1 piece design heat exchanger:. Ice scratchers will be required in hard pack conditions.
103 lb. drive clutch engagement spring rate, produces a smoother
belt engagement at 2800 rpm (p/n 0646-252)
All models that do not come with a larger tunnel storage bag,
comes with a belt storage bag.
On the bottom of the dash air intakes:
New FrogSkinz design for better adhesion. They are cut differently
in the corners to lay flatter and not wrinkle.
Tie rod location moved forward 0.625” for tighter turning radius.
Spindle machined to allow clearance for the sharper turn.
The option of choosing multiple tie rod locations has been omitted.
Ski stance changed to a narrower 38” stance.
HCR 800 Remains 42”
Steering range is 17.5% wider at the same degree of handlebar
throw. Steering effort is increased but still less than the old M.
No drive clutch fan on any model for 2013.
Tri-hub wheel Will be all plastic like the ProCross Models.
Track remains 3.0 Pitch. Lug Height Changes from 2.25” to 2.6”.
85 Duro on HCR Only.
Driven shaft is now shot peened to prevent from being fractured.
Increased control for the ID to OD of the bushings in the drive
clutch to keep them from moving.
Driven clutch movable Sheave bearing changed from a DU bearing to a Vespel Bearing.
Because of the heavy loads and high temperatures seen with
mountain riding and boondocking, a drive belt was developed to
better suit this riding style.
Spacer added to keep the drive belt from bottoming out in the driven
pulley.
New material for driven clutch rollers
Left Hand belly pan:
Pocket added for side panel to fit securely. Less snow ingestion and adds strength to the side panel to help against touching the drive clutch during aggressive riding.
Screen changed to a tighter grid to prevent snow ingestion through the air ducting.
A thumb screw and speed nut is now used to keep the side panel
from flexing and allowing snow in.
Added support to cooling duct, behind screen area and also to aid with a tighter fit when the left hand side panel is closed.
Clutch Alignment is now 1.450. Use alignment bar (p/n 0644-588)
New procedure during assembly of the driven shaft and locking collar.
