Looking to improve performance, stability, and planning for a Jon boat with a short shaft outboard? A 4″ setback jack plate is the top upgrade to raise the engine, reduce cavitation, and enhance planing abilities. This guide highlights five practical jack plates, focusing on small boats like skiffs, inflatables, and aluminum Jon boats. Best suits include budget-friendly retrofits, adjustable-height picks, and durable cast-aluminum builds for salt or freshwater use. Each option explains who it’s best for and why it stands out.
Summary table of selected products:
- Camoo MJ-1-DP 4” Setback Jack Plate (Wood Block Included) — Best for basic, entry-level setups on small OBs up to 35 HP.
- VELCKING MJ-1-DP Jack Plate 4” Setback — Best for adjustable height with secure mounting on 0–100 mm range.
- Bzcovac MJ-1-DP 4-Inch Setback — Best for optimized performance with cast aluminum, long-term durability.
- FQRANBO MJ-1-DP 4” Setback — Best for manual lift with robust 0–100 mm adjustment and included wooden block.
- RUIANOMG MJ-1-DP 4inch Setback Replacement — Best value replacement option with corrosion-resistant cast aluminum.
Camoo MJ-1-DP 4” Setback Jack Plate
Best for entry-level installations on small outboard motors up to 35 HP. This cast aluminum offset jack plate extends 4″ off the transom and includes a wooden mounting block for a secure fit. It is designed for clamp-on mounting on short shaft boats, making it suitable for skiffs, aluminum boats, and inflatables. The wooden block ensures precise alignment and easier installation. Caution: ensure shaft compatibility and mounting hardware are appropriate for your transom design.
VELCKING MJ-1-DP Jack Plate 4” Setback
Best for adjustable-height needs on small outboards up to 35 HP. This jack plate offers height adjustment from 0 to 100 mm in 20 mm increments, with rubber pad mounting blocks and stainless steel screws for secure mounting. Durable hard steel alloy construction resists vibrations and impacts from waves. Choose this if you want precise engine- height tuning and a secure, long-lasting fit. Limitation: heavier build may require more careful handling during installation.
Bzcovac MJ-1-DP 4-Inch Setback
Best for performance-focused small boats seeking optimized hydraulics. The 4″ setback moves the engine away from the transom to improve propeller efficiency and reduce cavitation. It also features a 3″ lift for shallower waters, helping with shallow-water navigation and better maneuverability. The cast aluminum construction offers corrosion resistance and durability. Limitation: benefits may be most noticeable with engines in the 6–35 HP range, so verify your motor size and boat type before purchase.
FQRANBO MJ-1-DP 4” Setback
Best for manual lift with easy, controlled adjustments. It offers up to 4″ setback and 0–100 mm height adjustments, plus a wooden mounting block. This jack plate is compatible with engines up to 35 HP and supports straightforward leveling and positioning to maximize top speed and stability. Caution: installation requires precise alignment to avoid binding or mounting stress if hardware isn’t aligned properly.
RUIANOMG MJ-1-DP 4inch Setback
Best value replacement option for outboard motors up to 35 HP. This cast aluminum jack plate increases hull and strut clearance, allowing long shaft engines to fit short shaft boats and improving shallow-water performance. Durable and corrosion-resistant, it’s suitable for dinghies, aluminum, and inflatable boats. Limitation: confirm compatibility with specific transom dimensions and bolt patterns before ordering.
Buying Guide
What size and setback should you choose?
For Jon boats with short shafts, a 4″ setback is a common sweet spot. It moves the engine away from the transom to reduce propeller cavitation and improve water flow. If your boat sits high on plane, consider a small lift in combination with setback for optimal trim.
How important is engine height adjustment?
Adjustable-height models let you fine-tune the propeller’s bite and boat ride. Height ranges of 0–100 mm (or similar) give flexibility for different loads and water conditions. If you frequently switch between shallow and deeper waters, a larger adjustment range is beneficial.
What materials matter?
Cast aluminum is common due to its corrosion resistance and strength-to-weight ratio. It’s suitable for saltwater or freshwater use. Steel alloys and wooden blocks provide mounting rigidity, but ensure they’re compatible with your transom and mounting hardware.
Are additional mounting blocks included?
Wooden mounting blocks or rubber pads help achieve a secure fit and reduce vibration. Confirm that the included blocks match your boat’s transom thickness and mounting pattern to avoid gaps or misalignment.
What installation considerations should you expect?
Verify hole patterns, bolt spacing, and overall plate dimensions before purchase. Ensure you have the correct hardware for stainless steel or bronze fittings when required. Some kits include hardware; others require separate purchases.
FAQ
- What is a jack plate?
A jack plate is a mounting accessory that raises and/or shifts the engine on the transom to improve performance and steering on small boats.
- Who should use a 4″ setback jack plate?
Boats with short shaft outboards up to 35 HP that need improved planing and reduced cavitation can benefit most.
- Is adjustable height necessary?
Not always, but it helps when you operate in varying water depths or carry different loads, allowing precise tuning of trim and speed.
- What are common mounting materials?
Cast aluminum is typical for durability and corrosion resistance; hardware is often stainless steel or bronze to resist corrosion.
- Can I install a jack plate myself?
Yes, with proper tools and a careful follow-through of the mounting pattern and torque specs. If unsure, consult a marine professional.