Minimum Age Requirements 14

	G	Cylinder Bore				±.003	In	2.755	2.441	3.002	2.343
	J	Piston Stroke				±.011	In	2.519	2.362	2.414	2.343
	L	Rod Length				±.006	In	4.566	4.134	4.250	4.095
	K	Deck Height				±.012	In	7.12	6.575±.03	--	6.516
	F	Piston Length				±.030	In	2.637	2.559	2.500	2.52
	M	Port Height				±.030	In	--	--	--	--
	Number Of Ports Per Cylinder			A	Transfer			3	3, Note #5	4	3
				B	Exhaust			1	1	4	1
				C	Piston			2	--	--	--
	Port Height			A	Transfer	±.035	In	0.531	.433 Main, .453 3rd	.666	.472
				B	Exhaust	±.035	In	1.062	.782	.759	.872
				B1	Exhaust	±.035	In	1.456	1.614	--	1.551
				C	Piston	±.035	In	--	--	--	--
	Port Timing			A	Transfer	±2°	Atc	120°	124.6° Main, 122.0° 3rd	118°	123°
				B	Exhaust	±2°	Atc	93°	98.2°	102.9°	101°
				C	Piston	±2°	Atc	--	--	--	--
	Reed Block (One Cylinder)		# Of Ports					6/Cylinder	4	8	4
			Length X Width Size Of Ports			Max	In	3 @ 1.000, 3 @ .890x0.640	1.024 X 0.605	1.11 X .56	1.20 X.543
			Reed Mat'l					Any	Any	Any	Any
			Reed Thickness			±.001	In	X	X	X	X
			H	Reed Stop Hgt.		Max	In	.250	.156	.300	.250
			Y	Checking Dis.		±.030	In	1.098	1.30	1.50	1.22
	Weight (One Set)		Flywheel			Min	Lbs	7.5	9.7 (Man); 10.5 (Elec)	7.1	8.0
			Pistons, Rings, Rod, Wrist Pin, Spacers, Bearings			Min	Lbs	14.0	13.1 Note # 1	1.75 (Piston Assy Only)	See Notes

Manufacturer								Nissan / Tohatsu	Suzuki	US Marine	Yamaha
Gearcase Model Identification								Ns40c	Dt30c	357	6j8
Advertised Sales Name								Ns40c	Dt30c	357	30
	Gear Ratio							13:25	11:23	13:26	13:24
	X	Exhaust Tube Length-Powerhead Base To Primary Tube End				±.25	In	S=12.10 L=14.10	S=10.04 L=11.8	--	--
	Q	Torpedo Length (W/ Propshaft)				Max	In	14.370	13.3	10.15	12.56
	R	Torpedo Width				Min	In	3.425	3.27	2.96	2.97
	S	Strut Width				Min	In	1.496	1.30	1.00	1.276
	S2	Strut Width (2" Forward Of Trailing Edge)				Min	In	--	--	--	--
	W	Dis. From Propshaft To Cavitation Plate				±.2	In	5.944	5.75	5.37	5.43
	Y	Length Of Skeg From Propshaft				±.2	In	5.875	5.55	5.27	5.04
	Z	Torpedo Length				±.2	In	8.74	8.45 See Note	6.75	8.07
	V	Propshaft Centerline To Powerhead Base			Long Shaft	±.2	In	29.467	30.43	--	29.39
					Short Shaft	±.2	In	24.467	25.70	27.16	24.63
	Y1	Skeg Thickness				Min	In	.25	.22	.35	.216
	Y2	Skeg Thickness				Min	In	--	--	--	--
	Y3	Skeg Thickness				Min	In	.49	.32	.35	.32
	Z1	Skeg Thickness				±.2	In	3.25	3.12	2.34	3.94
	Z2	Skeg Thickness				±.2	In	--	--	--	--
	Z3	Skeg Thickness				±.2	In	6.0	4.95	3.92	4.92
	Dia	Propshaft Dia				±.1	In	.748	.70	.75	.69

  RULE BOOK

RULE 18 ¥ BOAT STANDARDS

A.   The length is to be measured parallel with the fore and aft centerline from the rear of the transom at the point of engine attachment, to the foremost part of the bow. A tolerance of two inches will be allowed in measuring overall boat length dimensions.

B.   No add-on extensions to the hull will be permitted to achieve class length. Fins are not included in measurement of boat length. (Figure J)

C.   The minimum weights assigned to a specific class shall include motors, steering systems, motor controls, hardware, instruments, and all securely attached cushions, fuel tanks and brackets, batteries and boxes, fire extinguishers, etc. Any fuel remaining in the tanks at the end of the race will be included in the boat weight. Driver's weight will be included with life jacket and helmet and clothing as raced. No water will constitute any part of the total class weight. All weights other than the driver, engine and its controls, and fire extinguishers must be fastened in such a manner that their centers of gravity cannot be moved during the race. Except in races of longer than one half hour duration per heat, only one fuel tank will be allowed. No weights, other than the engine and its controls, may be fastened in locations external to the hull where they may constitute a hazard upon impact with another object.

D.   In questionable cases, acceptability of a given hull shall be the responsibility of the Referee and his decision shall be final.

E.   All boats constructed with false floors, seat box compartment or air filled flotation tanks must be fitted with inspection holes of at least 7/8 inch diameter such that no point inside said tank is more than 24 inches (24") from inspection hole. These holes may be plugged during competition but must be open for weighing and inspection.

F.              There shall be no devices or arrangements specifically to take advantage of external air pressure to produce or assist planing.

RULE 20 ¥ OUTBOARD MOTOR STANDARDS

A.   An Outboard motor is defined as a complete internal combustion power and propulsion unit that can be attached to a boat and which can be lifted bodily from the hull as one unit. Batteries used for ignition and starting, tachometer, throttle control and steering arrangement are excepted.

B.   A manufacturer of outboard motors for Outboard Performance Craft Racing is one who filed specifications and is responsible for the original design and manufacture of the following: crankshaft, connecting rod, cylinder head, cylinder, crankcase, gears and valving arrangement, and who complied with such other requirements as provided by these rules.

(1)     Motors must be the product of a recognized manufacturer engaged in the production of outboard motors offered for sale to the general public. Manufacturers may be of either foreign or U. S. origin and motors must be available in the U. S. through normal dealer networks.

(2)  All engines in Pure Stock classes must be capable of shifting from the driver's seat, with one hand on the steering wheel, by electric or mechanical methods and be capable of forward and reverse shifting at all times.

(3)     There shall be no alterations of parts with the exception of spark plugs, carburetor jets, and propellers, or specific parts approved by the Technical Committee and approved by the Commission. The intention is to race the engine exactly as manufactured and without special performance boosting accessories. The gearcases on motors raced in Pure Stock classes must be raced with either the same surface coating or paint as supplied by the manufacturer, or with no surface coating or paint over part or all of the surface of the gearcase casting, but the smoothness of the metal surface must under no circumstances be better than that supplied by the manufacturer.

(4)  No special parts or interchange of parts will be allowed, unless approved by the Commission.

(5)  In all classes the trim tab, thrust and locking washers may be altered or removed from the lower unit to permit the use of any propeller, thrust washer or nut.

(6)     Cylinder head and power head attaching studs may be substituted for bolts.

(7)     Electronic engine RPM limiting devices may be eliminated.

C.     Stock Engines (Outboard) as referred to in these rules shall be defined as outboard models which:

(1)  Are manufactured in annual or model year quantities of greater than 250 units.

(2)  Are intended for sale to and to be used by the general public.

(3)  Are advertised through the same media, in the same publications and given the same prominence as the manufacturer's other engines.

(4)  Are distributed through the manufacturer's normal channels.

(5)  Are not equipped with an accessory or high speed gearcase.

(6)  Are equipped with standard under cavitation plate or through prop exhaust.

D.     Super Stock Engines (Outboard) as referred to in these rules shall be defined as outboard models which:

(1)  Are manufactured in annual or model year quantities of more than 25 units.

(2)  Are not necessarily intended for sale and to be used by the general non-racing public.

(3)  Are not necessarily advertised through the same media, in the same publications and given the same prominence as the manufacturer's other engines.

(4)  Are not necessarily distributed through the manufacturer's normal channels.

(5)     Accessory gearcase, as submitted by the manufacturer, may be used in these engines provided that they are built in a total quantity of no less than 25.

(6)     Exhaust stacks not contained in the driveshaft housing will not be permitted.

(7)     Standard factory production models may run in Super Stock classes.

(8)  Only one manufacturer's engine should be approved per class.

E.              Engines run in Sport and Super Stock classes may only be run in the configuration that they were homologated in by the Technical Committee.

RULE 21 ¥ MOTOR MANUFACTURER'S REGISTRATION

A.   The procedure for registration of motors is as follows:

(1)  The manufacturer shall submit ten ( 10) copies of the engine specifications to the Chairman of the Motor Technical Committee no later than September 30. A carbon copy of this correspondence shall be sent to the OPC Chairperson and to the Executive Director, APBA National Headquarters.

(2)         The Chairman of the Technical Committee, upon receiving the engine specifications shall expeditiously survey all members of the Technical Committee for their approval or objections.

(3)  The manufacturers shall submit one copy of his full line folder for the succeeding model year to the OPC Chairperson by September 30th of each year, showing all models which are candidate for Pure Stock OPC approval.

(4)     Final approval of specifications of a new engine model will be contingent on the Technical Committee inspecting said model and verifying that the specifications represent the model and that the letter of the rules is not violated by this model, and therefore report its findings to the OPC Chairperson.

(5)     After receipt of a recommendation on the adequacy, form and details of the specifications from the Chairman of the Technical Committee, it will be at the discretion of the OPC Chairperson to approve the specifications and poll the OPC Racing Commission.

(6)     Final approval for use in Outboard Performance Craft racing of any motor described above shall not be given until the Chairperson of the OPC Racing Commission has advised the APBA National Office that he is satisfied that all provisions of the rule have been with, and until such time as the Chairperson shall have specification sheets on the motor sufficient to supply the appointed inspectors at regattas, and until such time as the manufacturers have built at least 250 motors of the model submitted for registration except Super Stock engines.

(7)  New Models: Motor specifications, as defined in the foregoing parts of this rule, shall be frozen for the period of one racing year, effective November 1 through October 31. All approved engine makes and models must be published in the Propeller as soon as possible.

(8)  New Pure Stock Models: No models shall be approved for competition between February 1st and November 1st for that racing year.

(9)  New Super Stock Models: No models shall be approved for competition between May 1st and November 1st for that racing year.

(10) No motor shall be eligible for Outboard Performance Craft racing until such time as the model has been registered with the OPC Racing Commission by the motor manufacturer and until such time as the model has been advertised for sale to the general public and is available for purchase through retail dealers for national distribution prior to January 1 st of a given racing season, except Super Stock engines which are often sold directly by the manufacturer.

(11)     Models approved are eligible for competition, after notification of the OPC membership starting no earlier than November 1st or no later than January 1st.

(12) In cases of questionable integrity, the OPC Chairperson may poll the OPC Commission regarding a candidate model.

(13) In all cases it shall be the responsibility of the present OPC Chairperson and present Commission to perform all steps for approval of new Pure Stock models.

(14) If, after September 30, racing rule changes are approved allowing additional non-registered motors to compete in a class, the manufacturers must submit specifications, etc., prior to December 31st in compliance with sections (1) and (3) of this rule.(15)     Engines will have major part Component groups. Any changes of these parts is limited to the original manufacturer of the same. Any changes to any of these groups carries the same requirements of payment and part quantities effective November 1, 1992. a. Cylinder and crankcase assembly b. Crankshaft assembly (includes crank parts, rod and piston) c. Induction system assembly d. Ignition e. Midsection assembly f. Gearcase assembly g. Any bore or stroke change constitutes an engine homologation h. parts or component groups not listed above will be considered minor parts.

(16)     Homologation fees will be reviewed on an annual basis. New engine homologation $600.00. Major part homologation $250.00. Minor part homologation $150.00. Payment, drawings, pictures and related data on parts and/or engines must accompany the same when submitted. All are to be sent to the OPC Chairperson and are not refundable. Fees are to be put into the OPC Promotional Fund and a separate accounting of these funds for the Motor Technical Committee will be maintained.

B.              Prototype engines may be raced in established classes (except the SST classes), with no points or prizes, at the discretion of the Race Committee. Approval of this testing must be given to the manufacturer at the APBA Annual Meeting by the OPC Commission. In races with national high point totals, drivers must be polled when a new motor is being tested or included in a class.

RULE 22 ¥ REPLACEMENT PARTS

A.   Only such parts shall be permitted as are standard production OEM parts used on the motor as the purchaser may obtain it from the dealer as a stock item or electrical or electronic products as approved by the OPC Technical Committee and the OPC Commission, and published in the Propeller and available to the general public through dealers. These products cannot provide any performance advantage over original OEM parts.

(1)  No replacement part for current production motors shall be considered standard production until this part appears on current production motors which can be purchased from the dealers.

(2)  Any replacement part for motors no longer in production shall be approved only after the part being replaced is no longer available for the motor model from the manufacturer or is specifically approved by the Commission.

(3)     Final approval of non-OEM electrical or electronic parts approved for use in OPC racing shall not be given until the Chairman of the OPC Racing Commission has advised the Executive Secretary that he is satisfied that all provisions of the rule have been complied with, and until such time as the manufacturers have built at least 250 units of the part submitted for homologation.

(4)  For non-OEM electrical or electronic parts, the manufacturer must follow the same rules as specified for motor manufacturer registration with respect to submission of specifications to the Chairman of the Technical Committee and the time period for which the parts are approved.

(5)         The OPC Technical Committee reserves the right to retain all submitted electrical or electronic parts for a one year period.

RULE 23 ¥ MOTOR MODIFICATIONS

Pure Stock and Super Stock classes:

A.     There shall be no blueprinting or modifications whatsoever to the motor as furnished by the manufacturer other than:

(1)  Any carburetor jets, spark plugs or propellers may be used provided other parts are not altered to accommodate them with the exception of the trim tab.

(2)  Only such parts shall be permitted as are used by the motor manufacturer on the particular model as built on the production line (see Rule 23). Modifications covered by a manufacturer's service or engineering bulletins are legal seven days after the date of any such bulletin and approval by the OPC Technical Committee, provided all direct purchasers of affected engines are notified by mail as well as all OPC inspectors, followed by printing in the Propeller at the next opportunity. In the event the manufacturer is unwilling or unable to meet these criteria, modifications covered in such bulletins will be legal after printing in the Propeller.

(3)     Oversize pistons furnished by the manufacturer of an outboard motor may be used in the model for which they are furnished. The bore of the engine may be enlarged by the amount that the oversize pistons differ from the standard size pistons. An additional total 0.005 inch enlargement of the bore will be allowed for bore enlargement due to wear or re-matching errors, or measuring tolerance. Under no circumstances may the bore be enlarged more than 0.035 inch over the original dimension. It is not permissible to chromium plate cylinder walls unless the motor manufacturer uses chrome plating of cylinder walls as standard production procedure on that particular model.

(4)     Tachometer, fuel and water pressure, and temperature gauges may be installed if desired.

(5)  The attachment of a steering bar or its equivalent may be accomplished at any point or points on an engine. Any cowlings or plates removed may be cut and, must be replaced. Any openings created by this operation must be sealed to prevent the engines from pulling in air. Studs or bolts may be exchanged to secure steering bar.

(6)     Throttle return springs will be allowed on engines, however no modifications to the engine will be permitted to install same; no drilling of holes, etc. Mounting links may be attached with present fasteners.

(7)     Isolation Mounts: Only those supplied by the engine manufacturer as original equipment or through the service group are acceptable.

(8)  Any adjustments of mixture control, throttle and shift linkage will be allowed. Any mechanical adjustments of spark advance will be allowed provided no modifications are made either to the spark advance system or the engine as manufacturer.

(9)     Safety tilt switches and safety starting switches may be disconnected or bypassed.

(10) Fuel pumps, filters, heat exchangers or auxiliary tanks may be installed in the boat provided the use of same entails no modification to the engine and fuel lines so used to connect to the fuel connector provided with the engine.

(11) The attachment of a power trim system may be accomplished at any point or points on an engine. Only those parts of the production motor interfering with the attachment and function of the trim system may be altered or removed.

(12) Bead blasting will be allowed at the block and crankcase interface only. No other internal parts will be allowed to be bead blasted.

RULE 24 ¥ INSPECTION PROCEDURE

A.     Motors, hulls, and other equipment subject to these rules shall be inspected by the inspector prior to the contestant entering the water at the event and a report of any violation of rules and regulations submitted at the earliest possible moment to the Race Committee for action.

B.   Such equipment shall be available for examination previous to the race and if found not in compliance with any governing rule or regulation, unsafe, unseaworthy, or unmanageable, or if the owner or driver has failed to live up to the rules, the Race Committee may rescind the entry. Correction or substitution may be permitted if made previous to competing in the race but the start shall not be delayed to allow compliance.

C.     Immediately after the finish of a race, contestants shall report with their boats and motors to the Inspector such place as designated by the Race Committee. The boat and motor shall remain in the custody of the Inspector until dismissed. For the purpose of the enforcement of OPC technical rules, the engine and boat shall be assumed to have been raced in the same condition in which it appears during post race inspection. A boat, which flips or sustains substantial damage in a heat, does not have to meet minimum weight requirements for theheat in which the damage was sustained (at the inspectors' discretion).

D.   The Inspectors shall have the power after the finish of any race to order any contestant to dismantle his motor for inspection and measurement. Any contestant refusing to comply with the orders of the Inspector or Pit Manager or who violates the provisions of Section C of this rule shall be disqualified by the Race Committee.

E.   Each winning boat and motor and such others as may be designated by the Race Committee, shall be torn down, inspected, measured and weighed. The Referee may waive inspection except at Regional, Divisional and National Championship regattas or if a protest has been filed or records are claimed.

F.   The Inspector shall inspect and check the boat with the same powers and requirements defined for motors in other sections of this rule. Boats in each weight regulated class must be weighed at the Inspector's discretion. If the boat is not equipped with a lifting bridle per Rule 4, Section I, it will be disqualified. All water must be removed from the boat prior to weigh in.

G.   The driver shall be responsible for the condition of the motor and hull as raced. Errors on the part of the manufacturer, boat builder, mechanic, or previous owner shall not excuse noncompliance with the rules.

H.   The Referee shall record a disqualification on a specific member's card whenever:

(1)  A driver does not report with his boat to the Inspector after a race for inspection.

(2)  A driver refuses to dismantle his engine when asked to by the Inspector.

(3)  A driver forfeits a race rather than submit to inspection.

(4)  In the opinion of the Inspector, the driver has defied the rule and competed non-stock equipment.

(5)  All appropriate paperwork must be forwarded to APBA Headquarters.

I.   In case of infractions of any technical rules during a heat, the driver shall be disqualified from that heat and all other heats of the race.

J.   Any technical disqualification during a sanctioned event shall disqualify that participant for all racing under that sanction in that class.

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