Previously you had three choices:
Do nothing. Run a seven-tooth driver: The diameter of a seven-tooth driver is 6.2”. The diameter of the none-tooth 2.52” pitch driver that you had stock is 6.8”. If you chose to run a seven-tooth driver, your approach angle will increase six degrees. We have all been going to eight inch or even nine-inch rear idlers to reduce the rolling resistance of the track. Going to a 6.2” driver would be counter productive. The space between the track and the bulkhead is very close. You might have to run your track tighter than you want. If the track climbs out on the anti-ratchet teeth and hits the tunnel without disengaging from the anti-ratchet teeth, you could spin the driver hubs or worse. -
Roll the chaincase: If you roll the chaincase, you can use an eight-tooth driver. Its diameter is 8.65” (including the points) and it radius is 4.32”. Using a stock chaincase, the distance from the center of the drive shaft to the outside edge of the jackshaft is 7.25”. A 2.5” track is 2.75” thick, including the belting. Adding the radius of the eight-tooth driver and the thickness of the track, you get a little over 7”. There is barely enough distance between the two shafts to let the track ratchet and not hit the jackshaft. Once again, you might have to run the track a little tighter than you would like.
You now have a fourth choice. Install our extended chaincase. The measurement between the shafts is 9.25”. We use the stock mounting holes. It is easy to install. The secondary clutch and jackshaft remain in their stock location. That makes it easier to get the drive belt on and off. There is over .75 ”clearance from the 2.5” tracks and the tunnel, even when using an 8 tooth three inch pitch drivers. The ice and snow the track carries forward can easily flow thru the front of the tunnel.
Our chaincase is designed to use a 45-tooth bottom sprocket. This will give you more flexibility in changing your gearing. All this and your approach angle will be reduced almost 10 degrees as compared to the seven-tooth driver installation.
Order yours today and be prepared for the deep snow this winter. |
