USXC Racing Rules

The 2017-2018 USXC Racing Rules Book

Rule Book updated occasionally. Last updated on 5/8/2017.

All-Terrain Note:

All-terrain events will need a State Trail permit.

2017-2018 USXC Classes

The USXC has announced 24 classes for the 2017-2018 season. Below are a list of classes for all drivers.

120 - Racing will be run by the DMC Motorsports at their own events, they will have their own rules etc. A link to them will be posted. USXC will not be racing 120 class machines.
200 Stock - Ages 7-12 - Arctic Cat ZR 200 & Yamaha SnoScoot. No modifications.
200 Open - Ages 7-12 - Arctic Cat ZR 200 & Yamaha SnoScoot.
Junior 10 - 13 - Max 570 cc fan cooled stock sleds with gearing change (gearing chart will be in sled specs in Rule Book) or Expert class sleds with 50% throttle block. Or 600 Limited class sleds with 50% throttle block and exhaust valve closed.
Junior 14 - 17 - Max 600 cc fan cooled or 85hp class sleds or 600 Limited class sleds with 50% throttle block.
Junior 10 - 13 Girls - Max 570 cc fan cooled stock sleds with gearing change (gearing chart will be in sled specs in Rule Book) or Expert class sleds with 50% throttle blockOr 600 Limited class sleds with 50% throttle block and exhaust valve closed.
Junior 14 - 17 Girls
- Max 600 cc fan cooled or 85hp class sleds or 600 Limited class sleds with 50% throttle block.
Vintage & Vintage Legends - Legends are over 50, 1984 and older leaf spring sleds, 500 cc fan max & 440 cc liquid max.
Classic IFS - (2 classes) 18 to 50, and Classic IFS Legends over 50. 1980 to 1998 IFS, 600 cc max. open shocks, any track, chassis, engines, hoods, seats, susp. geometry must remain stock as produced.
Expert 600 Limited – Experienced level riders. 85hp class sleds or 600cc Limited class sleds with 50% throttle block.
Expert 600 Limited Improved - Chassis and external motor mods. allowed. 85hp class sleds or 600cc Limited class sleds with 50% throttle block.
Trail - All 500cc or less liquid cooled sleds & 600cc fan cooled or less or 600cc limited sleds.
Sport 600 Limited – Beginner entry level class on expert class sleds. 600cc Limited class sleds with 50% throttle block.
Sport 600 (EFI sleds - ISR Factory Stock 600 class) -
Up to 600cc liquid cooled sleds, 1.25 track lug height, must be 18, 16 to 18 must have prior race experience and race director approval.
Sport Open (ISR Pro Stock class - Carb or EFI model sleds) - Improved chassis & internal motor mods OK, or older IFS class machines.
Pro Womens (EFI sleds - ISR Factory Stock 600 class) - 600 Limited class sleds with 50% throttle block, must be 16 years old.
Masters 40 (EFI sleds - ISR Factory Stock 600 class) - 600cc liquid cooled, 1.25 track lug height.
Masters 50+ (EFI sleds - ISR Factory Stock 600 class) - 600cc liquid cooled, 1.25 track lug height.
I-500 Factory 600 (EFI sleds - ISR Factory Stock 600 class) - 2014 Super Stock class will now be referred to as I-500 Factory 600 which will be fuel & oil injected EPA compliant machines, 2016 and older 600cc.
I-500 Open - (ISR Enduro 600 Soo class - See USXC Rule book, page 21)
Semi Pro Factory 600 (EFI sleds - ISR Factory Stock 600 class) -
Up to 600cc, liquid cooled, 1.25 lug height.
Pro Factory 600 (EFI sleds - ISR Factory Stock 600 class) - 600 cc liquid cooled, 1.25 lug tracks, must be 18 unless prior race director approval.
Pro Open (ISR Pro Stock class - Carb or EFI model sleds) - 600 cc liquid cooled, chassis and engine mods allowed, max limit of 1050cc on all 4 stroke sleds with chassis and engine mods allowed. (ISR Enduro 600 Soo class - See USXC Rule book, page 21)

Safety

1. CELL PHONE – we encourage all drivers to carry a cell phone – we will have a dedicated emergency phone. Number ___________________

2. If you stop to aid an injured racer and it can be verified, your time will be adjusted.

3. Full coverage helmet

  • 2015 or newer Snell Certificate or ECE2205 Code
  • Must have 75% blaze orange
  • Must be fastened at all times

4. Race Jacket - needs to have at least 144 sq. inches of orange on the front and back. This does not include the space the numbers take.

5. No orange paint or decals on the snowmobile.

6. Eye protection is mandatory – is recommended that you carry a spare pair of goggles. If corrective lenses are required to drive a motor vehicle – you must use them to race also.

7. UPPER BODY PROTECTION IS MANDITORY – per ISR rule book, page 19. See illustrations

  • Must have shoulder pads
  • Shin and knee guards mandatory – both legs – guard must extend from instep to above the knee cap
  • Neck braces and elbow pads are recommended

8. There will be a pre-race equipment check – make sure to have your helmet and equipment along at check in.

9. The USXC with have upper body protection and helmet covers for rent – quantities will be limited, so call ahead to reserve.

10. USXC will have transponders to rent – we would like to get a handle on how many we need. If you have one, please send us your transponder number. If you will be renting, please let us know that as well so we have enough on hand.

pdfPrintable Safety Rules

Classic IFS Rules

1. Any 1980 through 1998 – 600 cc or smaller IFS Snowmobile

2. Must be a stock production machine that was available through the dealer network

3. Engine - must remain stock, no porting of cylinders. Stock compression ratio. No over bore on plated cylinders. Maximum of .020 over on steel liners. Must match sled model as produced.

Read more...

Track Rule on 600cc sleds

USXC will be retaining the 1.25 inch track rule for this year on all 600 cc race sleds.  It was proposed to go to a 1 inch track for lake racing but after doing a survey of drivers and the manufacturers, the results were about 50/50. We will run this year and look at it again in the spring.

If you have comments please send to This email address is being protected from spambots. You need JavaScript enabled to view it., attention Brian.

Thanks,
Brian Nelson