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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.
This could be anything! Could you use the 'Comment' button below with Photos of the bolt hole AND where it is on the bike? This will give more clues as to what it is used for.
The gear oil is the final drive oil - on the back wheel it's the hub assembly that the drive shaft ties into. There's a bolt at the top of it for filling and one at the bottom to drain. You should drive the bike a little to warm the oil, then you can drain the oil through that lower plug. I usually open the filler one on top while draining and I pour some fresh gear oil in to kind of flush it. Then install and tighten the drain plug. Fill with fresh oil right to the top of the filler plug. Some drain plugs are magnetic to pickup metal debris (normal) so clean that off when you have it out.
Clean all oil from the bike exterior. Leave it sitting in an upright position for a period of time. This may require a bike lift or other such device. Then look for leak source. Make sure oil level is not too high. When changing oil it often gets on the cross member and may leak when on the jiffy satnd for a while until it is all gone from this area. Make sure to always use thread sealant and a good o-ring on the drain plug.
Oil drain plug is located near the bottom of the engine, left side toward the front. The oil filter element is located on the right side of the engine under the cover toward the front. Changing the oil filter usually requires removal of the front exhaust pipe. There is an aftermarket filter relocation kit that replaces the filter element with a spin on filter that mounts on the front of the bike.
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