Bath Sno-Flakes Snowmobile Association
Bath Sno-Flakes Snowmobile Association

South Tier 500 

Any questions on tech rules call 

or text Vince at 315-254-8408

 

STOCK TROPHY & MONEY 

 

In Stock and Stock based classes, no change or mod is allowed unless specifically allowed by these rules. If these rules do not specifically allow a change or mod, then it must be assumed that the change or mod is not allowed.

1. Snowmobile must begin as a qualified stock snowmobile.

2. The snowmobile must have orginal OEM for the model engine, frame suspension, cowl, fuel tank, airbox, variable speed converter, and seat. Named components must be OEM for the model and year, or properly filed OEM replacement that supersede the orginal OEM parts. Factory options are not allowed

 

Engine

1. No Component of the engine may be altered, changed, reduced or enlarged from the engine manufacter's orginal stock spec, nor may any additional components be added to the engine. Blueprinting of engines is not allowed. No removal of material whatsoever will be allowed. This is to include polishing, port matching, deburring, glass or snad blasting surfaces of material removal for the purpore of engine balancing or other reasons.

2. Maximum cylinder overbore for wear cannot exceed .020 inches (1/2mm).

3. Replacement pistons must be stock OEM for the model.

4. There will be no more than one cylinder base gasket to a cylinder. No changes in engine dimensions can be made by gasket adjustments.

5. A maximum of one venture per cylinder will be allowed in Stock Class.

6. OEM carburetor slide valve and replacement jet components, without

modification, are allowed in all classes. No modification to carburetor body or throttle body will be allowed.

7. CDI/ECU module may be reprogrammed

8. No Additional fuel pumps allowed.

9. Oil injection pump must remain in place and remain functional. Lines may be

removed and plugged. Oil injector nozzles may be removed and holes may be

plugged. Premix gasoline may be used

10. Engine must retain OEM for the modelcooling system concept. Liquid, fan, or free air cooling must be retained. Cooling circuits cannot be modified or removed. Cooling circuit must remain functional.

11. Spark plugs do not necessarily have to be OEM.

12 . The exhaust system as provided by the manufacturer for the model. Muffler

components and /or silencing material must be intact at all times.

13 . On snowmobiles with OEM electronic fuel injection, commercially available electronic control modules may be added to the OEM ECU for the purpose of increasing or decreasing fuel delivery only. The added module must be designed to plug directly into the OEM ECU and /or the OEM wire

harness without modification.

14. Airbox must remain OEM from manufacter. No cutting, altering, or removal of air box is allowed

15. Pump gas 93 octane max 

 

Drive

1. Production primary and secondary clutch must be OEM for the model.

2. Primary clutch and secondary clutch may be modified (no RPM limit).

3. Any combination of springs. Weights and ramps may be used. These components may be interchanged between any brands, providing there is no modification to the clutch to make the components fit.

4. No machining, grinding or welding allowed on clutches unless specifically

stated.

5. Metal may be removed from primary clutch ramps or flyweights.

6. Helixes may be machined for angle change. No material may be added. No

welding allowed. Billet helixes will be allowed.

7. Roller secondary clutches not allowed unless OEM for the model.

8. Drive chain sprockets may be changed provided that they are options filed by the manufacturer.

9. Drive belts do not need to be OEM.

10. Complete brake system must remain OEM stock for the make and model.

11. Brake control handle must remain in the OEM location (left handlebar, front side).

12. Track drive sprockets may be replaced with any OEM for the model drive

concept (i.e. Involute or external). Unless otherwise specified, no modification

allowed to frame, drive, or suspension can be made to install replacement

sprockets.

 

Ski Suspension & Steering

1. Must remain in original mounting location or option location pre drilled or indicated by the manufacturer.

2. Suspension kits not allowed. No rail extensions.

3. Limiter strap allowed, but must maintain an six (6) inch travel.

4. Sway bar may not be relocated. Sway bar must be OEM for the model

 

Track & Suspension 

1. OEM for the model suspension must be used. Suspension may be mounted

anywhere in the tunnel where the manufacturer has drilled, partially drilled, or

marked for mounting holes. Pre drilled plates may be drilled out to facilitate

suspension adjustment. Pre-drilled backing plate holes may not be enlarged or slotted.

2. Track suspension kits are not allowed.

3. Shocks must remain in OEM location.

4. .At the discretion of the region, marginal snow wheels along with brackets may be added or removed in all classes. Structural supporting components must remain.

5. Any suspension springs allowed. Spring concept must remain OEM for the model. No chassis or suspension modifications to facilitate spring installation allowed. Track suspension must maintain a 6 inch min travel.

 

Track & Traction 

1. Unless otherwise specified,the track must be OEM for the model. 

2. No chisel studs or grinding on studs allowed.

3. All OEM track lugs may be cut to 1 inch lug height. Width must remain OEM for the model

 

Frame & Body

1. Material may be added to chassis and suspension parts for reinforcement. The OEM for the model parts must be maintained. No material substitution

allowed.

2. OEM skid plate may be added for protection of sled bottoms and may not change the aerodynamics of the sled. Skid plate must be securely fastened.

3. Protective taping or screening will be restricted to the external openings of the

hood only. OEM vent covers and screens, which are intended for removal by the

consumer, may be removed. No additional venting allowed.

4. The OEM fuel tank is the only tank that can be used for fuel supply. Oil tank may not be used as fuel tank.

 

Ignition & Electrical

1. Ignition must be OEM for the year and model.

2. Lighting coil must remain in place.

3. Headlight and taillight must be original OEM equipment and must remain in original mounting location. Headlight and taillight must be operational at the start of the race. Taillight cannot be battery operated.

4. Tachometers, speedometers and or heat gauges may be installed. OEM gauges must remain in place. 

 

 

IMP STOCK TROPHY & MONEY

 

1. Snowmobile must begin as a qualified stock snowmobile.

2. Any alterations allowed in stock are allowed in Improved Trail Stock.

3. The snowmobile must have original OEM for the model engine, frame, suspension, cowl, fuel tank, airbox. components must be OEM for the model

and year, or properly filed OEM replacement parts that supersede the

original OEM parts.

4. Improved Trail Stock maximum width dimensions are as produced by the

manufacturer

 

Engine 

1. Engine parts must be OEM for the model except where noted. The following OEM

engine parts may be modified internally,but not replaced:

a. Crankcase

b. Cylinders. (No external fastening devices

for mounting cylinders allowed.)

c. Heads

2. The entire external portion of the engine must be stock appearing.

3. OEM stroke must be maintained.

4. The OEM number of cylinders must be maintained.

5. Cylinder head(s) must be OEM for the model. The cylinder head may be modified

internally including changed replaceable combustion chambers and machining out

of combustion chambers to install inserts. Replacement combustion chambers must

be commercially available. The visible outer portion of the cylinder head or cylinder head cover must remain stock appearing and the spark plug must maintain OEM location.

6. Cylinder must remain within the OEM shell dimensions to include crevices, bulges, etc. No visible external changes allowed.

7. The cylinders may be raised to change port height. If a plate is used to raise

cylinder height, the plate including gaskets cannot exceed ½ inch, (.500) in thickness.

8. Engine displacement may be increased by cylinder boring to the maximum

displacement for any Improved Trail Stock class. If so modified, the snowmobile is no longer eligible for smaller displacement classes.

9. Engine components allowable for modification or replacement.

a. Bearings

b. Rods-center to center dimension must

remain OEM for the engine.

c. Pistons

d. Piston pins

e. Rings

f. Gaskets

g. Reeds and reed blocks may be changed,

(external plate may be thicker) if they do

not change outside dimensions for the

cylinder or crankcase. No external

modifications allowed to the crankcase or

cylinder to accommodate reed block

change.

10. Air box may be removed. Air filters may be used. Internal and external

modifications to the air box are allowed.

11. On snowmobiles with OEM for the model Electronic Fuel Injection, the throttle body including the exterior may be modified for increased fuel flow. No welding of the throttle body allowed, this includes no welding for repair purposes. Systems that allow increased fuel delivery may be used. The stock control module must be used. No changes for increased airflow allowed. Increasing the size of the throttle body throat not allowed. OEM for the model throttle plate (butterfly) must be used.

12. Oil pumps may be removed. Oil injector nozzles may be plugged or removed.

13. No superchargers, turbochargers, or nitrous systems allowed.

14. Cooling system must be fully operational and retain complete stock appearance.

15. Harmonic balancer may not be removed.

16. One additional torque arm allowed (any style).

17. A torque plate is not allowed under engine or under motor mounting plate.

18. Any functionally silenced exhaust allowed. 

19. Pump gas 93 octane max 

 

Drive

1. Any primary and secondary clutch may be used.

2. Jackshafts of like material may be changed to accommodate a clutch

change. No welding allowed to accomplish this change.

3. Track drive axle and chaincase must remain OEM for the model and remain in

OEM location.

4. Any OEM for the brand track drive sprocket allowed. Unless otherwise

specified, no modification allowed to frame, drive, or suspension to install

sprockets.

5. Complete brake system must be OEM for the make and model.

 

Ski Suspension & Steering

1. Brake control handle must remain in the OEM location (left side, front side of bar).

2. Must maintain 6’’ (inches) of vertical suspension measured at the front bumper.

 

Track Suspension 

1. Track suspension may be located anywhere in the tunnel where the

manufacturer has drilled, partially drilled, or marked for mounting holes. Pre Drilled plates may be drilled out to facilitate suspension adjustment. Pre Drilled backing plate holes may not be enlarged or slotted.

2. Track rail extensions allowed.

 

Track & Suspension

1. Any commercially available one-piece molded rubber track allowed. 

2. Unless otherwise specified, the track must be used as produced by the molder

of the track. No trimming allowed.

3. No Cheisels studs or grinding on studs allowed

 

Frame & Body 

1. Any chassis alterations, additions or removals, which alter stock appearance

or dimensions are not allowed.

2. Tunnel can be repaired but must maintain OEM length.

3. The OEM fuel tank must be the only tank that can be used for fuel supply. Oil

injection tanks may not be used as a fuel tank.

4. Insulation foam may not be removed from engine compartment.

5. Tunnel material in all machines in all classes must maintain its structural

integrity and be free of wear from traction devices.

 

Ignition & Electrical

1. Ignition must be OEM for the model. CDI/ECU may be replaced with a unit from any stock qualified model within the brand. Flywheel and stator may be modified.

2. Fixed ignitions may be moved (+ or -) four (4) degrees.

 

 

IMP STOCK TRAIL TURBO

 

1. Engine must be OEM for the model.

2. Turbo must be OEM for the model and NO altering of housing or wheel.

3. Pump Gas 93 octane max

4. No straight pipe (must have muffled exhaust exitting the bottom)

5. Studder buttons are allowed 

6. Unaltered commericially available carbide tipped trail studs 

7. No side exhaust 

8. Rail extensions allowed

9. OEM for model Suspension.

10. No lightweight parts allowed 

11. Pump gas 93 octane max 

12. Safety Tether

 

 

PRO IMP

 

1. The snowmobile must have original OEM for the model engine, frame, and tunnel.

 

 

1. Engine components must be OEM for the model unless otherwise specified.

May be modified internally, but engine must retain its complete external stock

appearance and dimensions. 

2. Number of cylindersmust be OEM for the model. No external fastening devices allowed to secure or hold cylinders in place.

3. The cylinders may be raised to change port height. If a plate is used to raise

cylinder height, the plate, including gaskets, cannot exceed 1/2 inch (0.50

inch) in thickness.

4. Engine may be bored up to class limit. A two percent (2%) overbore allowed.

(EXAMPLE: 700cc engine may be bored up to 714cc’s to run in the 700cc class).

5. Crankshaft and crankcase must be OEM for the model. No modification allowed to the external surfaces of the crankcase even if the area is hidden by another part or bracket.

6. Cylinder head(s) must be OEM for the model. The cylinder head may be

modified internally. The visible, outer portion of the cylinder head or

cylinder head cover must remain stock appearing and the spark plug must

maintain OEM location.

7. Engine components allowable for modification or replacement.

Bearings

Rods (rod center to center must

remain the same)

Pistons

Piston pins

Rings

Gaskets

8. Reeds and reed blocks may be changed, (external plate may be thicker)

if they do not change the outside dimensions of the cylinder or crankcase.

9. No external modifications may be made to the crankcase or cylinder to

accommodate reed block change.

10. Carburetors, flanges and intake manifold must be OEM for the brand.

Internal modifications are allowed. Carburetor throat may be bored. Intake

concept and location must remain OEM for the model.

11. On snowmobiles with OEM for the model Electronic Fuel Injection the throttle body, including the exterior, maybe modified for increased fuel flow. No

welding of the throttle body allowed (not even for repairs). Systems that allow

increased fuel delivery may be used (i.e. Power Commander or others). The

stock control module must be used. No changes for increased airflow allowed. 

12. Except as noted, additional fuel delivery system or pressure charging is

not allowed.

13. Internal and external modifications may be made to the airbox. The airbox may be removed. Air filters may be used.

14. Oil pumps may be removed or disabled. Oil tank must be removed. Oil

injector nozzles may be removed and plugged. (If oil tank and overflow tank

are joined the oil tank must be disabled or the joined tanks removed.)

15. Flywheel harmonic balancer may not be removed.

16. Torque arms allowed.

17. Rigid motor mounts allowed. OEM for the model engine location must be

maintained. Replacing or adding metallic engine mounts is not allowed.

Replacing rubber/cushion parts with more rigid parts is allowed.

18. Cooling systems must be operational. May contain disconnects for cool down. Heat exchangers may be relocated, modified or removed.

19. Any functionally silenced exhaust system allowed. A commercially

available, functionally silenced muffler/silencer must be installed and

operational. 

20. Exhaust outlet must exit body downward and rearward. (If OEM

exhaust exits behind driver, pipe need not go downward). 

 

Drive

1. Any primary and secondary clutch maybe used. Roller secondary clutches

allowed.

2. Primary clutch and secondary clutch may be modified (no RPM limit).

3. Jackshafts, of like material and weight, may be changed to accommodate a

clutch change. No welding allowed on a jackshaft. Steel and chrome moly

allowed. OEM location of shaft must be maintained.

4. Any track drive sprocket and non-driving wheels allowed on the track drive axle.

5. Track drive axle and chain case must remain OEM for the model and remain

in OEM location.

 

Ski & Track Suspension 

1. Any aftermarket rear suspension shock may be used, but must resemble the

production shock in approximate overall body length, body diameter, and

mounting eye overall length.

2. Ski stance must be OEM for the model.

3. Sled must have a minimum ride height of three (3) inches measured at the

lowest point of the bulkhead/skid plate. Measurement point to be centered

directly in front of the track drive area, (using the spindle centers to determine

center point of bulkhead) and must retain 2 inches of remaining

compression travel with driver on snowmobile.

4. (Hill Drag Only) Limiter strap is allowed but must maintain a minimum of six (6)

inches of travel.

5. Any OEM handlebar for the brand may be used.

 

Ski & Ski Runner 

1. Aftermarket skis allowed. Skis must be commercially available and marketed

through normal sales activity. Minimum aftermarket ski length must be 18

inches. Ski width may not be trimmed. Skis may not be interchanged between

brands.

 

TRACK SUSPENSION

1. OEM for the brand suspension must be used. Suspension may be moved up

and down in the tunnel (limit 3 inches). OEM location must be maintained and

may not protrude beyond tunnel configuration.

2. Must retain 2 inches of remaining compression travel with driver on snowmobile.

3. Any aftermarket rear suspension shock may be used, but must resemble the

production shock in approximate overall body length, body diameter, and

mounting eye overall length.

4. Any size, material, and number of rear axle idler wheels allowed. Unless

specified, no modification to chassis or suspension allowed to accept idler

wheels. Rear axle may be moved upward in the slide rails to accept larger

rear idler wheels.

5. Commercially available long track rails and rail extensions allowed. To facilitate installation of long track rails, suspension may be moved up or down

in the tunnel (a limit of three inches). The front torque arm must be OEM

stock and located in the stock location on the slide rail. Rear torque arm must

remain OEM stock for the model and may be relocated to accommodate the

longer track and rail assembly. Suspension components must remain

OEM stock for the brand. Tunnel must be extended to accommodate the

longer track and suspension. 

 

TRACK & TRACTION

1. Any commercially available one-piece molded rubber track allowed. 

2. Commercially available long track rails and rail extensions allowed.

 

FRAME & BODY

1. Any chassis alterations, additions or removals, which alter stock appearance

or dimensions are not allowed. Tunnel can be repaired but must maintain OEM

length.

2. The OEM fuel tank must be the only tank that can be used for fuel supply.

3. Removal of any insulation that alters the outside stock appearance is not

allowed.

4. OEM hood and side panels must be used. Any lightweight body pieces are prohibited.

5.. Headlight assembly may be removed (opening must be closed or delete kit 

installed.

6. No lightweight suspension parts allowed

7. Fox float shocks are allowed in replacement of standard shocks

8. Safety Tether

 

 

PRO IMP 1000

 

ENGINE

1. Any stock qualified model may be used and the engine may be bored up to

class limit. A two (2) percent over class cc allowed (1020 cc).

2. Rod center to center may be changed.

3. Stroke may be changed.

4. Crankshaft may be modified or replaced.

5. Crankshaft gears may be changed.

6. Cylinders may be modified but must retain complete OEM dimensions to

include crevices, bulges, etc. If an OEM cylinder is modified it must remain

within .020 inches (1/2mm) per side, 040 inches (1mm) overall of the OEM

cylinder outer shell dimensions. Modifications must be blended into

original castings to retain OEM appearance.

7. Any aftermarket cylinder is allowed. Aftermarket cylinders must be

commercially available. The outside ofan aftermarket cylinder may not be

modified.

8. Cylinders may not be interchanged between brands. Welding on crankcase

is not an acceptable method to adapt aftermarket or other OEM cylinders to

crankcase.

9. Any commercially available head allowed.

10. Intake concept and location must remain OEM for the model.

11. The reed valve mounting area on the crankcase may be modified to change

reed angle. The upper surface of the intake tract may be reinforced by

welding or bonding.

12. More than one OEM type fuel pump allowed.

13. Carburetors, mounting spigots and air boots may be modified or replaced.

Flange can be modified internally.

14. Airbox may be removed.

15. Safety Tether

 

 

PRO MOD

 

1. Any engine allowed. Engine must not exceed displacement limit for the class.

2. Maximum overbore is defined as 2% over the cc displacement limit of the class.

3. Any functionally silenced exhaust system allowed. The exhaust emission pipe must not protrude more than three (3) inches beyond the chassis or hood configuration.

4. The clutch cover must be separate of the cowl configuration and cover the clutch perimeter and faces to the center of the clutch bolt or below. Snowmobiles with removable side panels may fasten clutch covers/ shields to

side panels to meet this requirement.

5. Any commercially available one-piecemolded rubber track allowed. No cleated

tracks allowed. Unless specified, no modification to drive, frame or suspension

allowed to install track.

6. Safety Tether

 

 

PRO MOD TURBO 

 

1. Engine must be OEM for model 

2. Turbo must be OEM for model unaltrered ( NO modify of compressor wheel or housing)

3. Any fuel permitted

4. Any studs permitted 

5. Clutch cover is required 

6. Safety Tether

 

 

KING OF THE TRAIL

 

1. Chassis serial number must be permanently affixed to the side of the tunnel in the area of the right side footrest.

2. Any fuel allowed 

3. Unaltered commericially available carbide tipped trail studs.

4. No side exit exhausts allowed (exhaust must exit fron the bottom with muffled exhaust) Turbo may be used as muffler as long as pipe off of turbo does not exceed 12 inches

5. Safety Tether

 

 

LAKE RACER

 

1. Chassis serial number must be permanently affixed to the side of the tunnel in the area of the right side footrest.

2. Power adders allowed

3. Safety Tether 

 

OUTLAW N/A

 

1. No power adders allowed

2. Safety tether

 

 

OUTLAW

 

1. Power adders allowed

2. Safety Tether

 

Where To Find Us:

Bath Sno-flakes Snowmobile Association

6993 County Route 15
Bath, New York 14810

 

Phone:607-776-2261

Email: clavabo4@gmail.com

Connect With Us!

Like us on Facebook

Print Print | Sitemap
© Bath Sno-flakes Snowmobile Association