4 Stroke Reverse Update, new 1/11/2012

[type_a_positive]

From krom at HCS:


http://www.hardcoresledder.com/foru...-4-stroke-reverse-update-new-1-11-2012-a.html

January 11, 2012
Dear Arctic Cat Snowmobile Dealer,

It has been determined that the Service Bulletins BS201204, BS201205 and BS201206 (see below) concerning the reverse gear shift components does not completely address the root cause of the reverse failures on 2012 ProCross and ProClimb 1100 cc 4-stroke
model snowmobiles.

Service Bulletin BS201204 — 2012 F 1100, XF 1100, and M 1100 Models VIN range: 105986-116385;
Service Bulletin BS201205 — 2012 XF 1100 Turbo Models and M 1100
Turbo Models VIN range: 116386-118569;
Service Bulletin BS201206 — 2012 F 1100 Models VIN range: 105809-105985 and 2012 F/XF/M 1100 Models VIN range: 800025-800030.

Effective immediately please discontinue installing Gear Shift Update Kit (p/n0637-361, 0637-362 or 0637-363) until further notice. We will be utilizing these kits in the future with an added replacement shift fork for all 3 kits that will become available soon.

We are sorry for the inconvenience that this has caused; Arctic Cat is diligently working with our supplier to resolve this situation and every effort will be made to expedite these parts to you as soon as possible. It appears that most of the 2012 ProCross and ProClimb 1100 cc 4-stroke models are not affected. If you have customers that have not
experienced any missed shifts, it is expected they would not experience a failure.

A letter is being sent to all registered owners to inform them to discontinue use of the
reverse function on their snowmobile if they have experienced any missed shifts until further notice. The 2012 ProCross/ProClimb 1100 cc 4-stroke snowmobile will perform as designed in forward gear without the reverse function utilized.

Thank you for your cooperation in this very important matter.

Sincerely,
Arctic Cat Sales Inc.

 

[Frosten]

Did a reverse update on mine today ,was 2 washers and another piece hope I will work for awhile:/ also did the crankhouse vent thing and checked the steering joint nut thing .

 

[turboedonproane]

The shift fork is the problem! They could build a new fork that is wider and round in diameter. This would put a pretty good band aid on the problem. The problem they have now, is that when the shift fork is in either forward or reverse, the opposite washer binds on an angle. The forward gear splines are a big problem if you plan on making big horse power. In the forward gear set, there should be locking dogs with a 1 to 3 degree negative draft angle on the locking dogs so that they actually pull the gear set tighter together in forward motion. The dog width would naturally be wider and create many times the shear strength.
The present design in the forward gear spline area is weak at best.