2000GT

1967-1970 / Coupe / Japan

All 2000GT problems All workshop issues

Common Engine, 3M 2.0L DOHC Inline-6 (Yamaha-Built)

Carburettor Deterioration and Synchronisation Drift

Symptoms

Rough idle, uneven power delivery, flat spots during acceleration, poor fuel economy, and difficulty starting. The engine may run rich on some cylinders and lean on others.

Cause

The three twin-choke Mikuni-Solex 40PHH carburettors use rubber diaphragms, accelerator pump membranes, and needle valves that deteriorate with age and fuel exposure. Modern ethanol-blended fuels accelerate deterioration of original rubber components. The carburettors also drift out of synchronisation over time, particularly if the car is driven infrequently.

Fix

Full rebuild of all three carburettors using NOS or reproduction rebuild kits.

Synchronise using a vacuum gauge or Uni-Syn tool after rebuild.

Specialist carburettor shops with experience on Mikuni-Solex units are rare, most 2000GT owners ship carburettors to dedicated specialists.

Cost: $3,000-8,000 AUD for a full rebuild of all three units, depending on condition and parts availability.

Cost mentioned in fix

Cost: $3,000-8,000

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// More 2000GT problems

Other known issues

Critical Engine, 3M 2.0L DOHC Inline-6 (Yamaha-Built)

Timing Chain Stretch

Rattling or slapping noise from the front of the engine, particularly on cold startup. In advanced cases, the cam timing shifts, reducing power and causing rough running.

Critical Engine, 3M 2.0L DOHC Inline-6 (Yamaha-Built)

Oil System Leaks (Dry Sump)

Oil puddles under the car, oil residue on the engine and chassis, dropping oil level in the external oil tank. Potential oil starvation if leaks are severe.

Common Engine, 3M 2.0L DOHC Inline-6 (Yamaha-Built)

Valve Clearance Drift

Ticking noise from the valve train at operating temperature, gradual loss of power, uneven cylinder performance.

Critical Cooling System

Radiator Core Degradation

Overheating, coolant loss, visible corrosion on radiator fins, reduced cooling efficiency.

Critical Cooling System

Water Pump Seal Failure

Coolant dripping from the water pump weep hole, low coolant level, overheating.

Common Body and Structure

Galvanic Corrosion at Mixed-Metal Joints

White powdery corrosion on aluminium panels, particularly where they attach to the steel chassis or steel substructure. Panels may become loose or develop cracks at attachment points.

View all 13 2000GT problems