Yamaha Motorcycles - Page 3 - Recent Questions, Troubleshooting & Support
How to plug the ais on a 2001 Yamaha vstar 650
If your Yamaha Vstar 650 is backfiring when decelerating, it could be due to a lean fuel mixture or an air leak. One solution is to adjust the air/fuel mixture screw on the carburetor, but before doing that, it's recommended to check and address the following:
- Inspect the exhaust system: Make sure there are no holes, leaks, or loose connections in the exhaust system. Fix any issues if found.
- Check for air leaks: Inspect the intake manifold and carburetor boot for any cracks, loose connections, or air leaks. If you find any, fix them and ensure a tight seal.
- Clean or replace the air filter: A dirty or clogged air filter can affect the air/fuel mixture. Clean or replace the air filter if necessary.
- Check carburetor jets: If the bike has been sitting for a while or the carburetor hasn't been cleaned in a long time, there might be debris or clogs in the jets. Remove and clean the carburetor jets.
- Adjust the air/fuel mixture: Locate the air/fuel mixture screw on the side of the carburetor. Gradually turn it clockwise or counterclockwise (usually clockwise) until the backfiring reduces or stops. Start with small adjustments, and make note of the screw's original position in case you need to revert the changes.
- If the backfiring persists, it is recommended to consult a motorcycle mechanic or Yamaha dealership for further diagnosis and assistance.
7/31/2023 7:38:22 AM •
Yamaha...
•
Answered
on Jul 31, 2023
2005 model 650. It idles OK but why does it lose power when I get (to) about 1/4 throttle and only gets to 50 mph?
If your 2005 model 650 motorcycle is experiencing a loss of power and struggles to go beyond 50 mph when you reach about 1/4 throttle, there could be several potential reasons for this issue. It's important to identify the underlying problem to resolve the performance concern. Here are some common causes to consider:
- Fuel System Issues: Insufficient fuel supply or a clogged fuel filter can restrict the flow of fuel to the engine, leading to a loss of power. Check the fuel filter, fuel pump, and ensure the fuel lines are clear and not kinked.
- Air Intake Blockage: A blocked air filter or a clogged air intake system can limit the amount of air entering the engine, affecting its performance. Clean or replace the air filter as necessary.
- Carburetor Problems: If your motorcycle is equipped with a carburetor, issues such as a stuck float, clogged jets, or incorrect adjustments can lead to poor performance. Cleaning and tuning the carburetor might be necessary.
- Ignition System Issues: Faulty spark plugs, ignition coils, or ignition timing problems can result in incomplete combustion, leading to a loss of power. Check and replace any faulty ignition components.
- Exhaust System Blockage: A restricted exhaust system, such as a clogged or damaged muffler, can impede the flow of exhaust gases, affecting engine performance.
- Engine Compression: Low engine compression due to worn piston rings or cylinder head gasket leaks can reduce engine power. A compression test can help diagnose this issue.
- Throttle or Choke Cable Problems: A misadjusted or sticking throttle or choke cable can affect the fuel-air mixture and throttle response. Ensure that the cables are properly adjusted and move freely.
- Electrical Issues: Faulty sensors, wiring problems, or issues with the electronic control unit (ECU) can impact engine performance. A diagnostic scan might be required to identify electrical problems accurately.
- Valve Clearance: Incorrect valve clearance can affect engine performance. Ensure the valve clearance is within the manufacturer's specifications.
- Transmission or Clutch Problems: Issues with the transmission or clutch can result in power loss and limited top speed. Inspect and service the transmission and clutch components.
It's essential to perform a systematic inspection and troubleshooting process to pinpoint the exact cause of the problem. If you are unsure about diagnosing or fixing the issue yourself, it's recommended to seek the assistance of a qualified motorcycle mechanic or dealership. They have the expertise and tools to diagnose and repair the problem effectively.
I have a 93fzr1000 genesies it starts out fine
Poor performance (missing & dying) when the the engine gets warmed up can very likely be a failing pickup coil. The pickup coil on this FZR1000 is bolted to the right side of the block ( hot location) and is covered by the fairing & gets very little cooling airflow. Disconnect the two-lead connector and check the resistance between the leads per the spec. In the Manuel. If within spec., heat the pickup coil with a heat gun and check it again to see if it's still in spec. If fails when hot it is not hard to replace. Removing the fairings is the most time consuming aspect.
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