ESA Trail Stock Class
500cc
(max)---650lbs. All
600cc-----------700lbs.(triple) 675lbs.(twin) *Sled jumping to a higher CC class DO NOT need to add weight.
700cc-----------750lbs.(triple) 725lbs.(twin)
800cc-----------775lbs.(triple) 750lbs.(twin)*Sled and driver’s combined weight must
900cc-----------775lbs.(triple) 750lbs.(twin) meet class min.
1000cc----------800lbs.(triple) 775lbs.(twin)
·
Trail stock is an entry-level division.
It is intended for a competitor to race his/her snowmobile just the way
he/she rides it in the trail.
·
No performance changes of any type allowed unless specified.
·
Internal carb parts may be
changed; air box may be removed.
·
Any clutch tuning parts
allowed. No engagement limit.
·
Exhaust silencers are
allowed. Pipes must be stock for model.
·
Cosmetic and lightweight bolt-on
parts allowed.
·
Sled and driver’s combined weight must meet class min.
·
Replacement trail type track allowed-lug height must be min. Of .750
inches. Trail type studs only-NO
sharpened studs allowed.
·
Front and rear suspension must be stock for model. Must have full travel-no additional limits or
tie downs allowed.
·
All snowmobiles must have tether cord, it is easy to install and
available at tech.
500
Stock--------------500cc max.
600
stock--------------600cc max. *All
snowmobiles must meet
ISR filed weight spec. For
700
stock--------------700cc max.
model.
800 stock--------------800cc max.
900 stock--------------900cc max.
1000 stock-----------1000cc max.
·
This is an ISR division, all ISR rules apply.
·
Snowmobiles must have OEM STOCK for the model: engine, pipes and
muffler, carbs, clutches, gas tank, hood, seat, console, front and rear
suspension.
·
Suspension may be limited to 2’’ remaining travel front and rear. Any stock length ski allowed-any replacement
springs allowed. Marginal snow wheels may be added or removed. Slides may be
removed.
·
ISR approved speed tracks are allowed.
Any race or trail stud allowed, max height-.750 over track lug. Air box may be replaced with filters. Carb tuning parts allowed. Any stock type clutch tuning parts
allowed. External cool-down allowed.
500cc
max.---------------650lbs. All
*All
Snowmobiles
600cc
max.---------------700lbs.(triple)
650lbs.(twin) must meet
class
weight with
700cc
max.---------------750lbs.(triple)
700lbs.(twin) driver, gas,
etc.
800cc
max.---------------775lbs.(triple)
685lbs.(twin)
900cc
max.---------------775lbs.(triple)
685lbs.(twin)
1000cc
max.-------------775lbs.(triple)
685lbs.(twin)
· Anything allowed in Trail Stock
and ISR Stock is also allowed in Trail Stock plus.
· Plus also allows
after market pipes and mufflers, after market reeds, replacement tracks and
sharpened studs, suspension limits and tie downs.
· NO ported or modified
cylinders or heads and carbs MUST be OEM.
500cc
max.---------------------550lbs(all)
600cc
max.---------------------600lbs.(triple)
550lbs.(twin) *weights are
sled
and
700cc
max.---------------------600lbs.(triple)
550lbs.(twin) driver
combined
800cc
max.---------------------625lbs.(triple)
550lbs.(twin) total
900cc
max.---------------------625lbs.(triple)
550lbs.(twin)
1000cc max.(OEM Cylinder)---625lbs.(triple) 550lbs.(twin) 1000cc OEM cylinder only
OPEN---0-1200cc
max.-----625lbs.(triple) 550lbs.(twin)
1200-+cc------------ 675lbs.(triple) 600lbs.(twin) *ONE CLASS
---------------------------------------------------------------------------------------------------------------------------------
· All snowmobiles must meet
minimum weight for CC. Class.
· All snowmobiles must not
exceed CC maximum for class.
· All snowmobiles must have
full body-OEM type chassis, NO open mods allowed.
· All engines must be normally
aspirated. NO turbo, supercharges or NOS
allowed.
· All ISR Pro Stock safety
rules apply.
500cc
max. 2%---------250lbs.
600cc
max. 2%---------250lbs.
*Minimum weight is
snowmobile only.
700cc
max. 2%---------250lbs.
800cc
max. 2%---------250lbs.
1000cc
max. 5%-------250lbs.
· Any alteration allowed in
Heavy Mod is allowed in Open Mod.
· Turbo chargers are
allowed. 4 cycle only.
· Superchargers and N.O.S. are
not allowed.
· Hoods: may be removed.
ISR Pro Stock
500cc
max.--------------550lbs.(All)
600cc max.--------------625lbs.(triple) 550lbs.(twin)
700cc max.--------------625lbs.(triple) 550lbs.(twin)
800cc max.--------------625lbs.(triple) 550lbs.(twin)
1000cc max.-------------625lbs.(triple) 550lbs.(twin)
·
Any alterations allowed in ISR Stock and ISR Imp. Stock is
also allowed in ISR Pro Stock.
·
Ski suspension: material substitution is allowed. All components must be mounted in the OEM
location on the chassis.
·
Ski and track suspension must have 2” travel for grass drag
and 1” travel for ice drag.
·
Rear suspension: Any track suspension allowed. Material substitution allowed.
·
Any track allowed. Must be commercially available. ONLY the track lug may be trimmed to a
minimum of ˝”.
·
Framed body” Material substitution is allowed. Tubular front ends, “bulk heads” are not
allowed.
·
Any carburetor allowed.
Must be one venturi per cylinder.
·
800-1000cc-any ignition allowed.
·
1000cc ONLY may use after-market cylinders. Reed angle may be changed. Top of reed housing may be modified.
ESA Heavy Mod
Classes weight
500cc
max 2%---------------500lbs.(all) *combined min.
weight is for
600cc
max. 2%--------------550lbs.(triple) 500lbs.(twin) sled and
driver.
700cc max. 2%--------------550lbs.(triple) 500lbs.(twin)
800cc max. 2%--------------550lbs.(triple) 500lbs.(twin)
1000cc max. 5%-------------550lbs.(triple) 500lbs.(twin)
· Any alterations
allowed in ISR Pro Stock is allowed in Heavy Mod.
· Any snowmobile
type engine allowed.
· Any chassis
allowed.
· Hood must have
top and side cowling and must be 1300 sq. Inches.
· After-market
fuel injection allowed.
· NO: turbo,
supercharges or N.O.S. allowed.
Classes
Weight
500cc max.--------------650lbs.(all)
600cc max.-------------700lbs.(triple) 675lbs.(twin) *All sleds must
meet class weight
700cc max.-------------750lbs.(triple) 700lbs.(twin) with driver, gas,
etc.
800cc max.-------------775lbs.(triple) 700lbs.(twin)
900cc max.-------------775lbs.(triple) 700lbs.(twin)
1000cc max.(OEM CYL)--775lbs.(triple) 700lbs.(twin) *OEM cylinders only
Open 0-1200cc------700lbs.(triple) 600 lbs.(twin)
1201-+--------750lbs.(triple) 650lbs.(twin) *ONE CLASS
--------------------------------------------------------------------------------------------
·
All snowmobiles must meet weight minimum for CC. class.
·
All snowmobiles must meet CC. maximum for class.
·
Material substitutions allowed for body and suspension.
·
All snowmobiles must be full body-OEM type chassis. NO lay downs or “open mods” allowed.
·
Any suspension allowed.
·
All engines must be normally aspirated. NO turbos, supercharges or N.O.S.
·
All ISR Improved Stock safety rules apply.
·
1000cc OEM cylinders only, 1% over bore.
ESA Super Stock Twin
Classes Weight
800cc
max. 2%--------------675lbs. *Minimum
combined weight
1000cc
max. 5%-------------700lbs.
is for sled and
driver.
Open
cc-----------------------700lbs.
· Must be Improved Stock type
snowmobile.
· All engines: 2 cylinders
only.
· After-market carbs allowed
· Long-track suspension kits
allowed.
· After-market cylinders,
heads and crank-case allowed.
· ISR Improved Stock safety
rules apply.
· Open cc, Pro Stock type snowmobiles allowed at 700lbs.
ESA Open Fuel
CLASS Weight
800cc----------------------No weight
rule
1000cc-+------------------No weight rule
·
Turbo chargers, super-chargers and N.O.S. allowed.
·
ISR Pro Stock safety rules apply.
ESA Top Eliminator
·
Top Eliminator is a bracket class based on a dial in E.T..
·
Only general safety rules apply.
ISR Improved
Stock
Classes
weight
500cc max. +1%-----------------650lbs.(all)
600cc max. +1%-----------------700lbs.(triple) 625lbs.(twin) *minimum
combined weight
700cc max +1%------------------750lbs.(triple) 675lbs.(twin) is for
sled and
driver.
800cc max +1%------------------775lbs.(triple) 685lbs.(twin)
900cc max +1%------------------775lbs.(triple) 685lbs.(twin)
1000cc max +1%-----------------775lbs.(triple) 685lbs.(twin)
·
Everything allowed in ISR Stock is also allowed in ISR
Improved Stock.
·
Engine, cylinders, heads, crank-case, carbs-MUST be
OEM. Internal modifications are only
allowed.
·
Any functionally silenced exhaust allowed.
·
Any primary and secondary clutch allowed.
·
Jack-shaft and drive-shaft may be replaced-MUST be like
material.
·
Drive sprockets may be replaced-rear idler wheel may be
replaced.
·
Any hood may be used-MUST be stock appearing.
·
800cc and 1000cc-any commercially available long track kit
(suspension) allowed.
·
1000cc ONLY-any after-market cylinders and after-market
heads allowed. Crank-shaft or stroke may
be changed. Carbs may be replaced.
RACE CLASSES
TRAIL STOCK-------------------ALL CC CLASSES
ISR STOCK-----------------------ALL CC CLASSES
TRAIL STOCK PLUS----------ALL CC CLASSES pipes and reeds only
ISR IMPROVED STOCK------ALL CC CLASSES
SUPER STOCK TWIN----------800cc, 1000cc, OPENcc
(1000cc only OEM cylinder) , OPENcc.
ISR PRO STOCK-----------------ALL CLASSES
PRO MOD--------------------------500cc, 600cc, 700cc, 800cc,
900cc,
(1000cc only OEM cylinder), OPENcc.
ESA HEAVY MOD---------------ALL CLASSES
OPEN MOD------------------------ALL CLASSES
OPEN FUEL-----------------------800cc, OPENcc
TOP ELIMINATOR-------------BRACKET