ASM Outboard Jacking Plate JP6Z — 6-Inch Setback, Top-Adjust Z-Lock

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The Outboard Motor Jacking Plate 6-inch (JP6Z) from ASM is the original Z-Lock manual jack plate built for serious water performance. Designed for modern V4 and V6 outboards (non-V8), it combines precise height control with rugged rigidity to keep your boat tracking true when every second on the water counts. Crafted from aircraft-grade aluminium with a full 1/2-inch thickness, this jack plate delivers weight-conscious strength and long-term durability under demanding marine use.

Why the JP6Z stands out

• Top-side adjustability with Z-Lock: Raise or lower the plate from the top using six internal lock nuts and three exterior bolts. Quick, tool-friendly height changes mean you can tune for chop, planing efficiency, or handling without crawling under the boat.
• 6" setback, 5" vertical range: Shift the prop arc back for improved water flow and reduced drag, while maintaining a generous vertical range to adapt to changing loads, gear, and hull characteristics.
• Rigid, repeatable alignment: The Z-Lock design locks side plates in place, eliminating slippage under vibration and spray for consistent performance run after run.
• Broad engine compatibility: Pre-drilled to fit most common bolt patterns and designed to support V4 and V6 engines, including dual steering configurations and up to 90-degree tilt angles. Up to 300hp capacity ensures powerful, confident takes off and stable high-speed operation.
• All-metal construction: Built to endure long seasons of racing, tournaments, and weekend boating with a robust, corrosion-resistant platform that stays true under load.
• Mercury note: Mercury models from 1976–1979 may require special install steps to accommodate unique mounting patterns.
• Warranty and support: 1-year limited warranty to the first retail purchaser, plus installation and maintenance guidance to keep your plate at peak performance.

Real-world benefits and use cases

Fine-tuning engine height with the JP6Z translates to measurable, practical gains on the water:

• A precise 6" setback moves the prop arc rearward, minimizing stern squirt and enabling quicker, cleaner planing across varying loads.
• Better fuel efficiency and wake control: Optimised water flow reduces drag and delivers a cleaner wake, improving stability and fuel economy over long runs or race days.
• Consistent handling across conditions: The Z-Lock system preserves alignment through chop, spray, and rough water, so you stay on course with repeatable results.
• Versatile for different hulls and gear: The combination of setback and vertical adjustability accommodates a range of boats and gear configurations without sacrificing control.

How it performs in practice

Setup is straightforward and repeatable. Before a run or when loading gear, loosen the internal lock nuts and exterior bolts, use the top-center adjustment bolt to raise or lower the plate, and then torque to the recommended specification. This design makes frequent height changes practical without losing alignment. For trailering or long moves, a quick tighten check keeps side bolts at the recommended torque to preserve performance and safety.

Specs at a glance

• Setback: 6 inches
• Vertical adjustment: 5 inches
• Construction: aircraft-grade aluminium, 1/2-inch thick
• Compatible engines: all V4 and V6 outboards, including dual steering; up to 90-degree tilt
• Horsepower support: up to 300hp
• Bolt pattern: pre-drilled for common patterns
• Warranty: 1-year limited

Whether you’re dialing in for a tournament, weekend cruise, or heavy-load runs, the JP6Z offers precise control, dependable alignment, and the robust build you expect from ASM. It’s not just a mounting plate — it’s a strategic upgrade that translates to faster planing, steadier handling, and measurable improvements in watercraft performance.

Installation Instructions 

IMPORTANT: After the engine is in place, tighten all hardware securely. To adjust the height of the jacking plate, loosen the three lock nuts on the inside of the plate (6 total). The (3) bolts (total 6) on the outside of the plate have to be loosened also. Turn the adjustment bolt at the top centre of the jack plate clockwise to raise it to the desired height. We recommend using a box-end wrench, an open-end wrench, or a socket. DO NOT USE AIR TOOLS! After adjustment tighten all side locking bolts securely. (We recommend 80 ft/lbs) CAUTION: DO NOT loosen or adjust the four locked bolts on the center adjustment screw. These move together and only serve to adjust the height, and do not require adjustment. Maintenance: Ensure all side bolts are tightened to a minimum of 80 ft/lbs of torque. This should be done after 3 hours of initial use and after every 10 hours of engine use after that. This check should also be done after every 300 miles of travelling. A visual and manual inspection of all side bolts should be performed before each engine use to ensure they are in place and not loose. Do not use engine if any bolts are loose or missing. WARNING: It is the Owner’s responsibility to maintain tightness of all bolts and nuts to a minimum of 80 ft/lbs of torque. Limited Warranty: T‐H Marine warrants to the first retail purchaser of this product for a period of one (1) year, from the date of original purchase, that this product will be free from defects in material and workmanship. This applies only to the original purchaser and must be returned to the manufacturer prepaid and with the original invoice. This warranty shall not apply to any product that has been repaired, altered, abused or installed in an improper manner. or consequential damages. This warranty applies only to the replacement or repair of this product and not to any replacement labour charges. Warranty is void if used for (1) Commercial boats, (2) Competition boats, (3) Improper installation, or (4) Engine horsepower exceeding the USCG maximum rating for the boat.