Yamaha Blaster atv carb cleaning

 This Yamaha Blaster atv has been sitting for awhile and won’t start. There is a good chance that the carburetor is probably dirty. The two stroke gas, as with any gas, gets bad after time and starts to cause buildup in the carburetor. The carb will be removed and cleaned out, so that it will start well again. Even if this or any two stroke engine will run after sitting awhile, there is a chance of build up of bad gas that could cause it to lean out and possibly even ruin the engine. So if your not sure how clean the carb is, it’s cheap insurance to clean it. The carb is located behind the engine.

Here is the fuel line which will need to be removed, don’t forget to turn off the petcock so that fuel doesn’t continue to run out after the gas line is removed. The rear arrow points to the air intake clamp. Loosen the clamp then pull the intake out of the way.

Now the top cap can be turned off once the clamp on the side of it is loosened up. Only a single screw holds the clamp that holds it.

The arrow points to the front clamp which is part of the reed block. Once this is loosened the carb can come out. The top is now loose and the throttle slide can be removed, be careful with the needle located at the bottom of the slide so that it doesn’t get dirty or bent.

Now turn the carb on it’s side and remove the four screws that hold the float bowl on. Here is how dirty the carb is, it definitely needed to be cleaned. Carburetor cleaner spray will be used on the dirt found in the carb to loosen it up. Some scrubbing will be required also, but be careful with the black float that hangs and swings, not to bend it. Occasionally the float needle can be stuck also, which you can see if its moving with the float. If not remove the float which is held by a single metal pin, then the whole assembly will come out together and can be cleaned.

This is the carb float bowl which is very dirty. Fill the bowl up with carb spray and leave it sit for awhile to loosen up the gunk. Later carefully scrape out the gunk until it is clean.

Here is the main fuel jet which will need to be removed by unscrewing it. There is a plastic piece that can also be removed once the main jet comes out.

Once the plastic piece is out of the way, you can see the main jet hole that was removed on the right and the hole for the pilot jet, also called the low speed jet, on the left. A small screwdriver as the one in the picture below will be needed to unscrew the pilot jet.

Here’s the pilot and main jet which are both dirty. Look through them to see if you can see light clearly through them. Here the jets are with a small drill bit passed through them, which were used to clean them. Also the top arrow is pointing at a single wire of a wire brush. Many times the wire can be used to clean out the smaller pilot jet hole that is very small. Generally most people wont have a drill bit small enough to pass through the hole, so wire can be used. Be careful not to remove the metal out of the jet only the dirt. Once clean the jets can be put back in place.

Here is the carb bowl after cleaning. It looks good and is ready to be returned on the carb.

This is the carb slide. It needs to be carefully placed back into the carburetor. There is a groove that runs all the way down the slide and needs to be lined up to a pin in the carb. It should easily slide to the bottom of the hole.

 As the slide gets close to the bottom make sure the needle lines up with the hole and it should go in easily. Now the carb should be ready to be put back together and the atv should be ready to run.