KTM ARO chain case mod
follow up on vega 350 doing the chain case mod.
1. 2013 ktm sx450/520 with 2019 ARO kit
2. removed chain shoe and put 15 tooth on bike and 18 on ARO
3. put 17tooth top 18 bottom in chain case
4. we made a bushing for the shoe removed to be the tensioner in the chain case because the round wheel on the chain vibrates and makes noise.
5 stock chains with no links changed
6.this gives a track run out of about 14.3 inches , works
Test ride in spring snow. Noticeable relief of effort to spin the track when unloading, quiet and really cut down on kit vibration by ? maybe 70%
For sure a power gain but it was hero snow so hard to tell. Let off the gas, bikes coasts, wouldn't do that before, able to ride tight woods without wanting to flame out or kill the motor on a bike with a high first gear.
Great mod for the work involved. A mystery why these kits don't come this way from Polaris ?