Help thread: Yamaha R1 runs only with choke after carb cleaning

On Yamaha R1 runs only with choke after carb cleaning, mark every original setting before touching screws. Then check fuel flow, float height, air leaks at the intake boot, and pilot jet cleanliness. Tiny dirt can create a very expensive-looking mood.

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 Yamaha R1 runs only with choke after carb cleaning before spending money.

Would you test Yamaha R1 runs only with choke after carb cleaning cold first, or wait until the symptom appears hot? Mine changes after about twenty minutes.

Thomas Spagnoli: workshop approach for Yamaha R1 runs only with choke after carb cleaning

Before buying anything for Yamaha R1 runs only with choke after carb cleaning, I would build a small test path. The cheapest repair is often the one where you do not replace a good part.

1. Confirm valve clearance and ignition health before blaming the carburetor.
2. Check fuel flow, float height, blocked pilot jet, air leaks, and the condition of the intake boot.
3. Return to a known baseline setting before tuning. Random screw positions make diagnosis muddy.
4. Read the plug after a proper test, not after two minutes of idling in the garage.

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

For students, this is exactly why I built the free Motorcycle Mechanics Course on this platform. It teaches the method behind fuel, spark, compression, charging, diagnostics and safe workshop habits, so problems like Yamaha R1 runs only with choke after carb cleaning become a sequence instead of a guess.

Add the model year, mileage, recent work and what changed before the problem started. With that, the next test becomes much easier to choose.

This helped a lot. I will make one change, ride it, then update the thread so the Yamaha R1 runs only with choke after carb cleaning discussion has an actual ending. This should make the Yamaha R1 runs only with choke after carb cleaning thread useful for the next person too.