Dedicated Subsystem WorkbenchPlatform Gen: 2021–2026

2023 Honda Rebel 1100 (CMX1100) Throttle Body Synchronization & Fuel Delivery

Multi-cylinder vacuum sync specs, idle speed, EFI high-pressure fuel rail PSI, and injector resistance multimeter bench for 2023 Honda Rebel 1100 (CMX1100).

Technical PassportOEM VERIFIED

Engine

1084cc

Cooling

Liquid-Cooled

Final Drive

525 Chain

Engine Oil

3.90 L (4.12 US qt)

Spark Plug

NGK SILMAR8A9S

Front Tire

130/70-18

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Gen 2021–2026

Factory Platform Compatibility: All workshop fluid capacities, maintenance milestones, torque specifications, and consumables on this specification sheet are factory-identical across model years 2021 through 2026.

Select Model Year:(Active: 2023)
6 Production Years (2021–2026)

2021 2022 2023 2024 2025 2026

Suggested Items4 Verified Workshop Consumables Available for this Job

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FSM Induction CalibrationParallel-Twin (270° Phased Crank) (2 Throttle Bores)

Fuel Delivery, Throttle Body Synchronization & Manometer Balancer

Factory intake depression specifications (230 mmHg), electronic fuel pump pressure testing (43.5 PSI), injector resistance, and interactive multi-column manometer balancing.

Warm Idle: 1,150 - 1,250 RPM

Quick Workshop Diagnostic Presets

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

OPTIMAL SYNCHRONIZATION: BALANCED (Δ ≤ 10 mmHg)

Diagnostics:Max Differential: Δ 0 mmHg (Factory Max Tolerance: ≤ 10 mmHg)

All 2 throttle plates pull uniform intake depression within factory engineering tolerance (≤ 10 mmHg / 1.33 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: 230 mmHg (±10 mmHg) at warm idle (1,150 - 1,250 RPM).

Reference: Cylinder #1 (Master)

Mechanism: Bypass Screws

CYL #1

MASTER REF

230mmHg

30.7 kPa · 9.1 inHg

±0 mmHg (Exact Target)

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

CYL #2

SLAVE BORE

230mmHg

30.7 kPa · 9.1 inHg

±0 mmHg (Exact Target)

Vacuum Take-Off Ports: Manifold vacuum spigots with rubber sealing caps

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

11.8 - 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

46 mm

Operating Temp

80°C (176°F)

Induction Type

PGM-FI Electronic Fuel Injection with 46mm Throttle By Wire

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 Manifold vacuum spigots with rubber sealing caps. 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 1,150 - 1,250 RPM, identify Cylinder #1 (Master). Adjust Linkage sync screw between throttle bodies with TBW dual-bore balance until all cylinder columns are within 10 mmHg (1.33 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

1 Active Campaign

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 1 safety recall campaign associated with this platform. Independent repair shops and riders should confirm that authorized dealership warranty remedies have been applied.

NHTSA #21V987000ENGINE AND ENGINE COOLING:COOLING SYSTEM:RADIATOR ASSEMBLY

Received: 16/12/2021▼

Defect Description

Honda (American Honda Motor Co.) is recalling certain 2021 Honda Rebel 1100 (CMX1100) motorcycles. The radiator cap may have been improperly formed during manufacturing, which could create an insufficient seal.

Safety Hazard / Consequence

An insufficiently sealed radiator cap may leak or spray hot coolant, increasing the risk of injury or crash.

Factory Remedy & Repair Action

Dealers will replace the radiator cap and refill any lost coolant, free of charge. Owner notification letters were mailed February 22, 2022. Owners may contact Honda service at 1-888-234-2138. Honda's number for this recall is KN1.

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.nhtsa.gov.

OEM Workshop Archives

Official Factory Service Bulletins & Field Updates

1 Documented Bulletin

Bulletin #HON-21V987Safety Recall KN1 (MTB 17798): Rebel 1100 (CMX1100) Radiator Cap Outer Hook Height Replacement

Source: Honda_Rebel1100_Recall21V987_KN1_RadiatorCap_Full.pdf

Mandated Torques:Torque: 9.8 N·m (7.2 lbf·ft) (Radiator Shroud & Neck Cover Fasteners)Torque: 1.5 N·m (1.1 lbf·ft) (Overflow Return Tube Spring Clamp Inspection)

Consumable Specs:Pro Honda HP Coolant 50/50 Prediluted (Phosphate & Silicate Free)Distilled Water Rinse Solution

Genuine Part Numbers:06190-MKR-30519045-MZ1-851

HONDA REBEL 1100 COOLING SYSTEMExploded View: Radiator Cap Sealing Interface (Safety Recall 21V-987 / KN1)

KIT # 06190-MKR-3051.1 BAR (108 kPa)

Remedy Radiator Cap (1.1 bar / 108 kPa / 16 psi)

Genuine Kit # 06190-MKR-305 (Kit, Cap Rad)

Push Down & Rotate Clockwise Until Stop Lugs Engage

CRITICAL SAFETY RECALL (Recall 21V-987 / Service Bulletin MTB 17798 / KN1). Factory die defect formed outer hook height exceeding specifications, causing the cap to ride over filler neck stops resulting in pressure loss and hot coolant spray. Replace with countermeasure cap having verified hook height.