2010 Gold Rush Box Stock Rules

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2010 Gold Rush Box Stock Rules

Post  Dan Chase on Tue Aug 03, 2010 8:24 pm

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
Blue Max

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.

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.
Dan Chase

Posts : 104
Join date : 2008-06-04
Age : 60
Location : Walnut Creek, CA.


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Re: 2010 Gold Rush Box Stock Rules

Post  Dan Chase on Tue Aug 03, 2010 8:35 pm


This form must be signed at time of entry by all Box Stock Competitors

Box Stock Claim Rules:

will be only from competitors in the same race group that may make a claim on
an engine.

may be claimed for $150.00 cash only. The claimer may state their intention to
claim an engine at the scale to hold the claimed engine in impound. No claim
related inspection will be started prior to the funds being posted with the
proper official.

claim form and cash must be submitted to the Race Director or Tech Director or
his or her designee, no later than 10 minutes after the end of the main event
race that the claimed engine is participating in. I.E. End of race = Checkered
flag lap complete and all karts are at the scale house.

Race Director, or his or her designee, will hold the claim money until the
claimed engine has been inspection for legality.

claimed engine will be tagged/marked and sealed as soon as it comes across the
scale after a claim has been submitted.
Areas to be sealed are valve cover to head, head to cylinder, block
cover to block, carburetor to manifold and muffler to header.

The claimed engine will be immediately taken to impound and/or presented to the
tech director for inspection following the main event for Box Stock in which
the motor was claimed. Engine must remain in impound and in the possession of
tech officials until tech inspection has been performed.

Both claimer and claimed have the option to be present at the time of inspection.

8. Any claim that is withdrawn will be assessed a $50.00 fee that will be paid to the
Host Club

9. Multiple claims on an engine will be decided via a lottery system. Owner, Driver or
family member cannot claim his or her own engine.

10. Claimed party will retain engine mount, air filter & cup, fuel pump, exhaust
system, clutch, chain guard, top plate and throttle linkage.

11. If the claimed engine is found to be illegal, the motor must be completely torn
down to check for additional illegalities. The Tech Director must confiscate
ALL illegal parts and related parts from the claimed engine.

12. Refusal of claim, destroying or withholding of parts, or any other lack of cooperation
in this claim or inspection process will be interpreted as an admission that
the engine is illegal and will be subject to an immediate disqualification and
loss of all points for the day. Driver
may also be subject to the conditions set forth in the Box Stock club or local

By signing this waiver, you acknowledge
that you have read and understand the claiming procedure for the Box Stock
class and agree to its terms and conditions. If driver is under the age of 18
years old, a parent or legal guardian must also sign the wavier.

Driver Name (please Print)_______________________________________________Kart#__________


Parent or Legal Guardian of minor_________________________________________ Date___________
Dan Chase

Posts : 104
Join date : 2008-06-04
Age : 60
Location : Walnut Creek, CA.


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