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According to AI, the transition between the two engines 2QM15 and 2GM15 happened around hull numbers in the late 200s to early 300s during the 1981 model year.

What hull number? Please post pictures and prices.

Price drop $17,500 OBO. This is a really nice J/30!

Still available.

Conundrum is hull #484 built in 1984 and is one of the small number of cockpit/cabin transition J/30s that combines the revised style cockpit with the fantastic 6 berth cabin. We have owned and raced her since 2021. She is an amazing J/30. Is equipped for Category 3 races, has a great inventory of race gear, and also some clever cruising accessories.

Asking $21,500

Located: Muskegon, MI

Some updates we have done since 2021
Replaced standing rigging in 2025
Lifelines replaced 2024 (bare stainless)
New chart plotter 2025
Digital network compass added in 2024
Quantum163% #1 Genoa 2023
Quantum dacron mainsail 2023
UK Sails X-Drive Carbon #3 2024
Quantum Spinnaker 2024
Genoa halyards replaced 2024 (UHMWPE)
New light weight (partially stripped) spinnaker sheets 2024 with Tylaska shackles
Mainsail halyard replaced 2022
Various sheets and control lines replaced 2022-2025
New mainsail cover 2023
Mainsail trim fine tune
Tylaska Genoa halyard shackles

Conundrum is set up with all controls leading to the cockpit. A two channel headsail foil with a Harken roller furler is easily convertible to “race modes” by removing components. All of the on-deck teak was replaced with stainless or aluminum components. Tack-Tic wireless, Raymarine 2000+ auto tiller, Standard Horizon radio, a fantastic stereo, digital 3-axis network compass, Harken windward sheeting car, Plastimo race compasses, many cruising/delivery sails, Yanmar 2GM, and more. Classic 80s racer/cruiser.

Conundrum always brought us home safe, often carrying some sort of trophy. She’s been written about twice on the J Boat website (maybe more like blurbed about, but we still thought it was awesome!). Crew had a lot to do with it but here’s how she did in some Lake Michigan races:

Clipper Cup
2022 1st in division
2023 1st in division
2024 1st in division
2025 3rd in division

The Hook
2024 1st in division J Boat Blog 2024
2025 3rd in division J Boat Blog 2025

Anchorage Cup
2023 2nd in division
2024 1st in division (4th overall)
2025 2nd in division

Commodore’s Invitational Grand Haven
2023 1st Place Division 3
2025 1st Place Division 3