Dedicated Subsystem WorkbenchPlatform Gen: 2014–2026

2024 Ducati Monster / Monster Plus / 821 / 1200 Throttle Body Synchronization & Fuel Delivery

Multi-cylinder vacuum sync specs, idle speed, EFI high-pressure fuel rail PSI, and injector resistance multimeter bench for 2024 Ducati Monster / Monster Plus / 821 / 1200.

Technical PassportOEM VERIFIED

Engine

937cc

Cooling

Liquid-Cooled

Final Drive

520 (525 on 821 / 1200) Chain

Engine Oil

3.40 L (3.59 US qt)

Spark Plug

NGK MAR9A-J

Front Tire

120/70 ZR17 (Pirelli Diablo Rosso III / IV)

Gen 2014–2026

Factory Platform Compatibility: All workshop fluid capacities, maintenance milestones, torque specifications, and consumables on this specification sheet are factory-identical across model years 2014 through 2026.

Select Model Year:(Active: 2024)
13 Production Years (2014–2026)

2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026

FSM Induction Calibration90° L-Twin (Desmodromic) (2 Throttle Bores)

Fuel Delivery, Throttle Body Synchronization & Manometer Balancer

Factory intake depression specifications (240 mmHg), electronic fuel pump pressure testing (43.5 PSI), injector resistance, and interactive multi-column manometer balancing.

Warm Idle: 1,200 - 1,300 RPM

Quick Workshop Diagnostic Presets

Simulate Throttle Linkage Asymmetry, Hunting Idle, or Intake Boot Vacuum Leaks

OPTIMAL SYNCHRONIZATION: BALANCED (Δ ≤ 15 mmHg)

Diagnostics:Max Differential: Δ 0 mmHg (Factory Max Tolerance: ≤ 15 mmHg)

All 2 throttle plates pull uniform intake depression within factory engineering tolerance (≤ 15 mmHg / 2.00 kPa). Delivers immediate linear throttle pickup, silky smooth idle, uniform cylinder torque pulses, and balanced exhaust temperatures.

Workshop Multi-Column Fluid Manometer

Damped intake depression columns. Target spec: 240 mmHg (±15 mmHg) at warm idle (1,200 - 1,300 RPM).

Reference: Horizontal Cylinder (Front Master)

Mechanism: Bypass Screws

CYL #1

MASTER REF

240mmHg

32.0 kPa · 9.4 inHg

±0 mmHg (Exact Target)

Fixed Reference Master. Synchronize all slave throttle bodies to match this column.

CYL #2

SLAVE BORE

240mmHg

32.0 kPa · 9.4 inHg

±0 mmHg (Exact Target)

Vacuum Take-Off Ports: Intake manifold vacuum takeoff ports with brass screw plugs

Damping Protocol: Restrictor valves must be adjusted until columns oscillate no more than ±5 mmHg per intake stroke.

Fuel Pump Pressure & 5-Min Hold Test

EFI Pressure Rail

Running Fuel Pressure

43.5 PSI(3.00 bar)

OEM Running Spec

43.5 PSI (±3 PSI)

PASS: WITHIN OEM RUNNING SPEC

Fuel pump delivery pressure is 43.5 PSI (Factory spec: 43.5 PSI ± 3 PSI / 3 bar). High-pressure regulator and pump rotor operating within factory design threshold.

Connect mechanical gauge to the quick-disconnect fuel rail fitting using an OEM banjo or T-adapter.

Fuel Injector Resistance & Induction Specs

Multimeter Bench Check

OEM Injector Solenoid Resistance

11.9 - 12.5 Ω at 20°C

Measure across injector 2-pin harness socket with ignition OFF. Internal coil resistance increases by ~0.4% per °C rise above 20°C (68°F). Replace injector if resistance reads open (> 100 kΩ) or shorted (< 2 Ω).

Bore Diameter

53 mm

Operating Temp

80°C (176°F)

Induction Type

Electronic Fuel Injection with 50mm/53mm Full Ride-by-Wire Throttle Bodies

Injector O-rings must be lubricated with a light coat of clean engine oil before seating into fuel rail.

4-Step Throttle Body Synchronization Protocol

Official workshop manual step-by-step checklist. Mark each step as you complete it on the workbench.

0 of 4 Steps Complete

1CLICK TO MARK DONE

Engine Pre-Flight Conditioning

Check and adjust valve clearances to spec before attempting sync. Ensure air filter is clean, spark plugs are fresh, and engine is fully warmed to operating temperature (80°C–90°C).

2CLICK TO MARK DONE

Manometer Connection & Damping

Connect 2-column liquid or digital manometer hoses to Intake manifold vacuum takeoff ports with brass screw plugs. Adjust in-line hose restrictor valves to dampen rapid intake pulsation until fluid columns stabilize.

3CLICK TO MARK DONE

Balance Screw Calibration

With engine idling at 1,200 - 1,300 RPM, identify Horizontal Cylinder (Front Master). Adjust Vertical cylinder balance screw with air bleed bypass screws on each runner until all cylinder columns are within 15 mmHg (2.00 kPa) of the master reference.

4CLICK TO MARK DONE

Throttle Blip & Locknut Verification

Blip throttle to 3,000 RPM 2–3 times and verify columns return evenly to idle balance. Tighten any balance screw locknuts securely, re-install rubber vacuum sealing caps, and verify idle speed.

Shop Carb & Throttle Cleaners→Shop Carb & Throttle Sync Tools→Shop Fuel Pressure Test Gauges→

Official NHTSA Safety Recalls & Technical Bulletins

4 Active Campaigns

U.S. Department of Transportation compliance database (Title 49 U.S.C. Chapter 301).

Verify VIN on NHTSA.gov

The U.S. National Highway Traffic Safety Administration reports 4 safety recall campaigns associated with this platform. Independent repair shops and riders should confirm that authorized dealership warranty remedies have been applied.

NHTSA #21V315000SERVICE BRAKES, HYDRAULIC

Received: 01/01/2021▼

Defect Description

Ducati North America (Ducati) is recalling certain 2017-2020 Monster 797, Monster 1200, Supersport, 2016-2020 XDiavel, and 2018-2020 Monster 821 motorcycles. Air may permeate the rear brake system.

Safety Hazard / Consequence

Air in the system may reduce effectiveness of the rear brakes, increasing the distance required to stop and the risk of a crash.

Factory Remedy & Repair Action

Dealers will install new rear brake hoses, free of charge. Owner notification letters were mailed on June 28, 2021. Owners may contact Ducati customer service at 1-888-391-5446.

Manufacturer Notes: Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.

NHTSA #21V335000SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:HOSES, LINES/PIPING, AND FITTINGS

Received: 01/01/2021▼

NHTSA #18V835000POWER TRAIN:MANUAL TRANSMISSION

Received: 01/01/2021▼

NHTSA #17V812000SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:MASTER CYLINDER

Received: 01/01/2021▼

OEM Workshop Archives

Official Factory Service Bulletins & Field Updates

1 Documented Bulletin

Bulletin #SRV-RCL-21-004Safety Recall 21V-315 & 21V-335 / CR211: Monster 821 & 1200 Low-Permeation Rear Brake Hose & ABS Circuit Retrofit

Source: RCSB-21V315-8478.pdf

Mandated Torques:ABS Control Unit Special Banjo Screws (51 / 55): 25 N·m ± 5% (Certification torque)Rear Master Cylinder Special Screw (53): 25 N·m ± 5% (Certification torque)Rear Caliper Special Screw (57): 25 N·m ± 5% (Certification torque)Swinging Arm Hose Grommet Screws (47): 8 N·m ± 10%Airbox M6x25 Screws: 9 N·m ± 10%

Consumable Specs:DOT 4 High Performance Brake FluidSingle-use Copper Crush Washers (Washers B, C, E, F)Self-Locking Cable Ties (Ties 65 & 66)

Genuine Part Numbers:Brake Hose A (Master Cylinder to ABS Control Unit, Chamfered Fitting)Brake Hose D (ABS Control Unit to Rear Caliper, Reinforced Shield)Copper Sealing Washers DIN 7603

NHTSA Recall 21V-315 & 21V-335Ducati Campaign SRV-RCL-21-004 / CR211

Ducati Monster 821 / 1200 Low-Permeation Rear Brake Hose & ABS Circuit

Rear brake hydraulic circuit retrofit: Low-permeation hoses, banjo screws 25 N·m with copper crush washers, swingarm clips 8 N·m & 10x ABS activation bleed test.

Brembo / ABS Safety RecallBanjo Screws 25 N·m / Bleed 10 N·m

Recall Countermeasure Components:Brake Hose A (Master to ABS)Brake Hose D (ABS to Caliper)Copper Washers B, C, E, FSelf-Locking Ties 65 & 66

NHTSA Safety Campaign 21V-315 & 21V-335 / Ducati SRV-RCL-21-004Monster 821 / Monster 1200 / SuperSport / XDiavel

Explore Other Subsystems for this 2024 Ducati Monster / Monster Plus / 821 / 1200

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Subsystem Guide/torques

Fastener Torques

Engine drain plug, axle spindles, caliper mounts, triple clamp pinch bolts & thread lubrication derating guide.

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Subsystem Guide/fluids

Fluids & Capacities

Oil: 3.40 L (3.59 US qt) • Coolant: 2.40 L (2.54 US qt) • Brake: DOT 4

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Subsystem Guide/fuses-relays

Fuses & Relays

Main: N/A • Location: N/A

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Subsystem Guide/compression

Compression & Leakdown

Ratio: 11.5:1 • Std: 165-210 PSI • Limit: 142 PSI

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Subsystem Guide/valves

Valve Clearances

Intake: N/A mm • Exhaust: N/A mm

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Subsystem Guide/electrical

Charging & Battery

Battery: YT12B-BS (12V 10Ah)

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Subsystem Guide/tires

Tires & Gearing

Front: 120/70 ZR17 (Pirelli Diablo Rosso III / IV) • Rear: 180/55 ZR17 (190/55 ZR17 on Monster 1200)

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Subsystem Guide/suspension

Suspension & Sag

Front Travel: 130 mm • Rear Travel: 140 mm

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Subsystem Guide/maintenance

Maintenance Schedule

Oil: Every 9,000 miles (15,000 km) mi • Valves: N/A • Plugs: Every 18,000 miles (30,000 km) mi

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