Post by Dan Chase on Aug 3, 2010 21:22:22 GMT -5
In addition to the rules below, there will be 2 race prepped Box Stock engines (1 yellow & 1 Blue) available for $150 or less to anyone who's engine is claimed. 
2010 Gold Rush Box Stock Rules
List of Approved Engines
Any 6.5hp Honda Clone
MODEL: 6.5hp 196cc OHV Engine (168 Series)
Also rebadged and sold under (but not limited to) the following names;
BS (Box Stock)
Central Machinery
Northern Tools
Carroll Stream Motors
Greyhound
Baja
Blue Max
ENGINE SPECIFIC TECH SHEET FOR: BOX STOCK 6.5 OVH
Description: Single cylinder, 2 valve, OHV 4 cycle
Important Note:
All parts must be Box Stock Project factory production parts
unless otherwise specified in this rules manual. No machining or
alteration of parts is allowed unless specifically noted. All parts
will be subject to a comparison to a know Box Stock part (when
performing a comparison check it is recommended to use a + /- .005”
tolerance). Engine will be teched as raced. There will also be a $150
claiming rule in place for this engine. Refusing to accept the claimer
will result in immediate disqualification of competitor along with
forfeiture of any points earned to date in class. Competitor will also
not be allowed to compete any longer in that class.
Combustion chamber volume:
26.5 cubic centimeter minimum, with piston at TDC.
Cylinder Head Requirements:
Must be OEM casting only. Porting and / or grinding are not permitted.
Valve seats are two angles 45 degrees valve face and 30 degrees top
relief. Stock head bolts only, must have four. Head gasket maybe after
market, must be of stock configuration. No copper or aluminum gaskets
allowed. Stock exhaust system only with no modifications. Any stock
configuration gasket allowed no other sealer.
Bore and Stroke: Stock cylinder bore is 2.685” max. Stroke is 2.123” + / - .005”.
Carburetor requirements:
Huayi OR RUI*ING model carb only. Carb to intake sealer is gasket only no other sealer allowed. Choke must be as supplied from factory, but may be fixed to stay in open position. Venturi .615” NO-GO. Rear carb bore .751” NO-GO. Main fuel jet .042” NO-GO.
Valve Train:
Stock valve cover only with any stock configuration gasket, no sealer.
Factory stock rocker arms and push rods only. Stock valves only 45 degree angle
only both valves, no modifications allowed. Only Box Stock valve
springs only. Max wire diameter on spring wire is .0705” with a maximum
tension of 10.8 lbs. at a height of .850”.
Ignition system:
Stock Box Stock system only and must be unaltered. Kill switch and low oil sensor may be disabled and removed.
Flywheel:
Box Stock flywheel only with plastic fins. No alterations of any type allowed. Must also run stock flywheel key.
Piston and Rings:
Must be unaltered Box Stock only. No machining of piston and rings allowed.
Connecting Rod:
Stock Box Stock rod only. No machining of any type allowed. Stock rod bolts only.
Crankshaft Requirements:
Stock Box Stock crankshaft required. Machining, polishing, addition of
material or other alteration of crankshaft is prohibited. Stock factory
timing gear mandatory and must be installed in original location.
Crankshaft journal diameter is 1.180”- 1.175” min.
Camshaft Requirements:
Stock as cast camshaft only, must meet the following specs;
Cam lobe base circle diameter .865" -.005”/+.010”
Duration check for Intake and Exhaust lobes (taken off pushrod). Intake duration of 218.5 degrees at .050 lift/85.5 degrees at .200 lift. Exhaust duration of 221.5 degrees at .050 lift/96.5 degrees at .200 lift. (All checks will allow +2 degrees for wear and gauge variances.)
Max Intake lift on cam .225” taken at the pushrod.
Max Intake lift at the valve .238” Taken on valve spring retainer with zero lash.
******************************************
Max Exhaust lift on cam .232” taken at the pushrod.
Max Exhaust Lift at the valve .242” Taken on valve spring retainer with zero lash.
Special note. Valve guide wear can give false valve lift readings when checking
off the front of the valve spring retainer. It is advised to take
readings at several other points around the retainer (back, and both
sides) if wear is suspected of giving a false, unfavorable reading.
Block Requirements:
Block must remain stock as produced. Stub for governor may be removed and the hole plugged. No machining of block allowed. Welding to the block shall be for rod damage repair only and may not constitute a functional modification.
Carburetor/Fuel Tank Requirements:
Floor Mounted fuel tank mandatory (stock tank must be removed). Pulse type fuel pump allowed. Fuel pump must be pulsed from either the crank case or the valve cover. You may install a flat metal plate in the original tank location for the
purpose of mounting the throttle linkage and fuel pump. Aftermarket air filter adapter allowed (max length of 1.375). Main fuel jet may be drilled to a no-go of .042 inch. Stock emulsion tube must be used and unaltered.
Header and Muffler Requirements:
Any single stage, one piece header made from .750” O.D. steel tubing allowed with the BS
tube style muffler part # 89966 or it’s aftermarket equivalent (ex: rotary power) installed at the end of pipe. The tube style muffler may either be welded or tread fitted to the pipe end. The entire exhaust pipe including the muffler is 14” max length and 10” min length.
Claimer Rule:
You must be entered and race in the box stock class to claim an engine for $150 (minus the clutch/chain guard/throttle kit, header pipe/muffler, air filter adapter/air filter, top plate & fuel pump).
Gold Rush Box Stock addition to the “Claimer Rule” above.
Claimer must state intention to claim, to track officials with money in hand within 10 minutes of end of the race. If the "claimed engine" fails tech, or if any engine that is used on competition day, fails tech due to cheating, the owner and/or of said engine will be
suspended from participating in the next race. A second technical violation in the same season will result in non-participation for the remainder of the races and loss of all
points. An engine claimer waiver is to be signed at each event by all box stock class participants. The participant agrees to become familiar with and abide by all rules, specifications and procedures as set forth in this rulebook and prescribed subsequently by the Gold Rush, its affiliates, officers or designated representatives. Please see claiming wavier for more details.
Gold Rush Box Stock rule modifications;
1) If it does not state that you can, then it is not legal to do it.
2) Gold Rush / Box Stock tire rules are used Bridgestone YKC. 4.5 x 5” fronts tires and 6.0 x 5” rear tires. Tire doping applied on or in the tires, at or off premises is prohibited.
3) After market carburetors, modified carburetors and Blueprinted carburetors are prohibited.
4) 87 octane unleaded, oxygenated, California refinery blended fuel w/ no additives. (This is not race fuel it is California spec. pump gas)
5) Senior Clone class 16 years old and up weight is 360 lbs.
6) IKF chassis and driver preparation rules will be enforced.
2010 Gold Rush Box Stock Rules
List of Approved Engines
Any 6.5hp Honda Clone
MODEL: 6.5hp 196cc OHV Engine (168 Series)
Also rebadged and sold under (but not limited to) the following names;
BS (Box Stock)
Central Machinery
Northern Tools
Carroll Stream Motors
Greyhound
Baja
Blue Max
ENGINE SPECIFIC TECH SHEET FOR: BOX STOCK 6.5 OVH
Description: Single cylinder, 2 valve, OHV 4 cycle
Important Note:
All parts must be Box Stock Project factory production parts
unless otherwise specified in this rules manual. No machining or
alteration of parts is allowed unless specifically noted. All parts
will be subject to a comparison to a know Box Stock part (when
performing a comparison check it is recommended to use a + /- .005”
tolerance). Engine will be teched as raced. There will also be a $150
claiming rule in place for this engine. Refusing to accept the claimer
will result in immediate disqualification of competitor along with
forfeiture of any points earned to date in class. Competitor will also
not be allowed to compete any longer in that class.
Combustion chamber volume:
26.5 cubic centimeter minimum, with piston at TDC.
Cylinder Head Requirements:
Must be OEM casting only. Porting and / or grinding are not permitted.
Valve seats are two angles 45 degrees valve face and 30 degrees top
relief. Stock head bolts only, must have four. Head gasket maybe after
market, must be of stock configuration. No copper or aluminum gaskets
allowed. Stock exhaust system only with no modifications. Any stock
configuration gasket allowed no other sealer.
Bore and Stroke: Stock cylinder bore is 2.685” max. Stroke is 2.123” + / - .005”.
Carburetor requirements:
Huayi OR RUI*ING model carb only. Carb to intake sealer is gasket only no other sealer allowed. Choke must be as supplied from factory, but may be fixed to stay in open position. Venturi .615” NO-GO. Rear carb bore .751” NO-GO. Main fuel jet .042” NO-GO.
Valve Train:
Stock valve cover only with any stock configuration gasket, no sealer.
Factory stock rocker arms and push rods only. Stock valves only 45 degree angle
only both valves, no modifications allowed. Only Box Stock valve
springs only. Max wire diameter on spring wire is .0705” with a maximum
tension of 10.8 lbs. at a height of .850”.
Ignition system:
Stock Box Stock system only and must be unaltered. Kill switch and low oil sensor may be disabled and removed.
Flywheel:
Box Stock flywheel only with plastic fins. No alterations of any type allowed. Must also run stock flywheel key.
Piston and Rings:
Must be unaltered Box Stock only. No machining of piston and rings allowed.
Connecting Rod:
Stock Box Stock rod only. No machining of any type allowed. Stock rod bolts only.
Crankshaft Requirements:
Stock Box Stock crankshaft required. Machining, polishing, addition of
material or other alteration of crankshaft is prohibited. Stock factory
timing gear mandatory and must be installed in original location.
Crankshaft journal diameter is 1.180”- 1.175” min.
Camshaft Requirements:
Stock as cast camshaft only, must meet the following specs;
Cam lobe base circle diameter .865" -.005”/+.010”
Duration check for Intake and Exhaust lobes (taken off pushrod). Intake duration of 218.5 degrees at .050 lift/85.5 degrees at .200 lift. Exhaust duration of 221.5 degrees at .050 lift/96.5 degrees at .200 lift. (All checks will allow +2 degrees for wear and gauge variances.)
Max Intake lift on cam .225” taken at the pushrod.
Max Intake lift at the valve .238” Taken on valve spring retainer with zero lash.
******************************************
Max Exhaust lift on cam .232” taken at the pushrod.
Max Exhaust Lift at the valve .242” Taken on valve spring retainer with zero lash.
Special note. Valve guide wear can give false valve lift readings when checking
off the front of the valve spring retainer. It is advised to take
readings at several other points around the retainer (back, and both
sides) if wear is suspected of giving a false, unfavorable reading.
Block Requirements:
Block must remain stock as produced. Stub for governor may be removed and the hole plugged. No machining of block allowed. Welding to the block shall be for rod damage repair only and may not constitute a functional modification.
Carburetor/Fuel Tank Requirements:
Floor Mounted fuel tank mandatory (stock tank must be removed). Pulse type fuel pump allowed. Fuel pump must be pulsed from either the crank case or the valve cover. You may install a flat metal plate in the original tank location for the
purpose of mounting the throttle linkage and fuel pump. Aftermarket air filter adapter allowed (max length of 1.375). Main fuel jet may be drilled to a no-go of .042 inch. Stock emulsion tube must be used and unaltered.
Header and Muffler Requirements:
Any single stage, one piece header made from .750” O.D. steel tubing allowed with the BS
tube style muffler part # 89966 or it’s aftermarket equivalent (ex: rotary power) installed at the end of pipe. The tube style muffler may either be welded or tread fitted to the pipe end. The entire exhaust pipe including the muffler is 14” max length and 10” min length.
Claimer Rule:
You must be entered and race in the box stock class to claim an engine for $150 (minus the clutch/chain guard/throttle kit, header pipe/muffler, air filter adapter/air filter, top plate & fuel pump).
Gold Rush Box Stock addition to the “Claimer Rule” above.
Claimer must state intention to claim, to track officials with money in hand within 10 minutes of end of the race. If the "claimed engine" fails tech, or if any engine that is used on competition day, fails tech due to cheating, the owner and/or of said engine will be
suspended from participating in the next race. A second technical violation in the same season will result in non-participation for the remainder of the races and loss of all
points. An engine claimer waiver is to be signed at each event by all box stock class participants. The participant agrees to become familiar with and abide by all rules, specifications and procedures as set forth in this rulebook and prescribed subsequently by the Gold Rush, its affiliates, officers or designated representatives. Please see claiming wavier for more details.
Gold Rush Box Stock rule modifications;
1) If it does not state that you can, then it is not legal to do it.
2) Gold Rush / Box Stock tire rules are used Bridgestone YKC. 4.5 x 5” fronts tires and 6.0 x 5” rear tires. Tire doping applied on or in the tires, at or off premises is prohibited.
3) After market carburetors, modified carburetors and Blueprinted carburetors are prohibited.
4) 87 octane unleaded, oxygenated, California refinery blended fuel w/ no additives. (This is not race fuel it is California spec. pump gas)
5) Senior Clone class 16 years old and up weight is 360 lbs.
6) IKF chassis and driver preparation rules will be enforced.
