Help thread: Kawasaki VN900 Classic main relay clicks but injector power is missing

For Kawasaki VN900 Classic main relay clicks but injector power is missing, make the stock setup healthy before tuning anything. Compression, valve clearance, air filter, plug color, chain/CVT condition and tire pressure all matter before chasing power.

If this involves road testing, keep it legal and safe. A quiet car park teaches more than a panic run down a public road. That is how I would approach Kawasaki VN900 Classic main relay clicks but injector power is missing before spending money.

Thomas Spagnoli: workshop approach for Kawasaki VN900 Classic main relay clicks but injector power is missing

Before buying anything for Kawasaki VN900 Classic main relay clicks but injector power is missing, I would build a small test path. The cheapest repair is often the one where you do not replace a good part.

1. Make the motorcycle mechanically healthy first: compression, valve clearance, plug, filter, fuel delivery, chain/CVT and brakes.
2. Choose changes that match the use case. City scooter, commuter, trail bike and highway bike need different compromises.
3. Confirm legal and insurance rules before derestriction, ECU work, exhaust changes or power kits.
4. Change one thing at a time and keep the original parts until the result is proven reliable.

The best next step is the one that can prove something. A test that only creates another guess is just a more expensive guess.

The free Motorcycle Mechanics Course on this site goes through this exact thinking: electrical checks, fuel checks, mechanical baseline, diagnostic flow and safe habits. It will help you approach Kawasaki VN900 Classic main relay clicks but injector power is missing with less guessing.

Post the machine model, year, mileage and one clear symptom, and I would choose the next test from there.

Would you test Kawasaki VN900 Classic main relay clicks but injector power is missing cold first, or wait until the symptom appears hot? Mine changes after about twenty minutes.

I am going to do the boring checks first. Annoyingly, the boring checks are starting to sound like the correct checks. At least now I know what I am trying to prove before spending money.