10-01-2018, 05:17 AM
The vintage snowmobile guys have compiled a ton of reference material on Tillotson HR's as well as the sleds they came on. There's also some info on the Mikuni VM. Check it out.
http://www.teshio.com/oldski-doosleds/enginecarb.htm
http://www.teshio.com/oldski-doosleds/enginecarb.htm