Motorcycle ECU reboots and re-primes fuel pump every time starter is engaged, causing severe flooding and inability to idle.

No dedicated diagnostic tool or software specifically for Yeson ECUs on Keeway motorcycles; general OBD tools don't interface with this proprietary system.

Severity

4High

Willingness to Pay

explicit

Added

May 14, 2026

Workarounds Described

cleaned ground wires manually
checked voltage with multimeter
used wiring diagram to verify connections
flamed spark plug to dry fuel
cranked with plug out and pump disconnected to clear flooding

Implied Software Gaps

Diagnostic tool that directly interfaces with Yeson ECU to read error codes and sensor data
Software that can log ECU resets and voltage drops to identify electrical interference

App Concept

ECU-Check: Yeson Diagnostic Tool

A handheld diagnostic device and companion app that plugs directly into Yeson ECUs (36-pin) to read real-time sensor data, log ECU resets, and pinpoint electrical interference causes. It includes a built-in fuel pump test mode and waveform analyzer for crank and cam signals, replacing guesswork with data.

Key Features

Direct OBD-II style connection for Yeson 28S-06 and similar ECUs
Real-time monitoring of ECU power rail voltage and reset causes
Guided troubleshooting flow for flooding, no-start, and idle issues
Waveform capture for crank position sensor and injector pulses

Target Users: Independent motorcycle mechanics and small shops repairing Chinese-made EFI bikes (Keeway, AJS, Herald, Lexmoto) in Europe and Asia.

Revenue Model: $299 one-time hardware purchase plus $49/year subscription for software updates and cloud log analysis.

Existing Solutions Mentioned

wiring diagrammultimeterspark plug testingcleaning ground wiresreplacing ECU

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