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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.
That is the overflow tube indicating you have a float or needle and seat problem.The needle seat and float control the fuel level in the carbs if the needle is worn it will over flow.If you have a bad float you will have a over flow If the carbs are dirty or gummed up and not alowing the parts to move is another reason it will leak. In any case best to clean and rebuild the carbs. clean and replace worn parts as needed.
This is an XS 650, no? Sounds like you might have some piston ring blow-by (especially if its burning some oil), or possibly bad valve seal's'. The valves could be tight, so make sure the valve clearance is correct first, then compression test, and finally a 'leak-down' test.
If it is blowing by, it probably is fouling plugs and you will need more energy in the spark to fire, but this is a secondary issue, which will be eliminated with the fixing of the other issues. Good luck!
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