Tecumseh 5hp fuel issue

[Willbodor]

Hello all

I have an enduro OHV 5hp tecumseh engine on my mini bike and I think I’m having a fuel delivery issue. The needle inside the bowl somehow became unattached to the float so I reattached the needle to the float and it starts right up and idles very well but for some reason when I give it throttle, it dies. I tried adjusting the idle screw higher and it will accelerate on its own but when I pull the throttle, it dies. Make it make sense lol

 

[Steve73]

Your getting too much fuel and its killing the engine.

Adjusting a Tecumseh carburetor bowl needle involves setting the float parallel to the carburetor body, usually measured with an 11/64" (4.37mm) drill bit. The float height is adjusted by bending the small metal tab that presses against the needle, ensuring the needle seals without compressing its spring.

 

[Willbodor]

Your getting too much fuel and its killing the engine.

Adjusting a Tecumseh carburetor bowl needle involves setting the float parallel to the carburetor body, usually measured with an 11/64" (4.37mm) drill bit. The float height is adjusted by bending the small metal tab that presses against the needle, ensuring the needle seals without compressing its spring.

Ohhhh okay I see what you mean. The tab on mine was bent too far up and the needle actually slipped out of the tab. When I put it back together I pushed the tab down to stop it from coming out but I must’ve done too much

 

[Steve73]

Ohhhh okay I see what you mean. The tab on mine was bent too far up and the needle actually slipped out of the tab. When I put it back together I pushed the tab down to stop it from coming out but I must’ve done too much

I had the same exact problem on a Fox bike I got once. Once ya watch the video and understand what's going on its an easy fix. Welcome to the community. Glad your here and we are ready to help so you can help others down the road.

 

[Willbodor]

I had the same exact problem on a Fox bike I got once. Once ya watch the video and understand what's going on its an easy fix. Welcome to the community. Glad your here and we are ready to help so you can help others down the road.

Update! I took the main jet from the Amazon carb and put it on the old carb along with a new bowl gasket, primed it up and it ran really well. Made it around the block twice without it dying and then all of a sudden it started dying under throttle again like before so I’m baffled

 

[Willbodor]

Your getting too much fuel and its killing the engine.

Adjusting a Tecumseh carburetor bowl needle involves setting the float parallel to the carburetor body, usually measured with an 11/64" (4.37mm) drill bit. The float height is adjusted by bending the small metal tab that presses against the needle, ensuring the needle seals without compressing its spring.

Update! I took the main jet from the Amazon carb and put it on the old carb along with a new bowl gasket, primed it up and it ran really well. Made it around the block twice without it dying and then all of a sudden it started dying under throttle again like before so I’m baffled

 

[Havasu Dave]

Gas cap vent ok? Float allowing enough fuel to remain in the bowl after two trips around the block?

 

[Willbodor]

Gas cap vent ok? Float allowing enough fuel to remain in the bowl after two trips around the block?

I’m not sure. I did adjust the float a bit and it did run better than before and I replaced the main jet. Maybe it’s still getting too much fuel? I’ll have to adjust the float again so the needle lets less fuel in the bowl at once

 

[Havasu Dave]

Or running out of fuel because the float adjustment is too high. Cap vent is vital.

 

[Willbodor]

Or running out of fuel because the float adjustment is too high. Cap vent is vital.

Idek where or if my engine has a cap vent

 

[Willbodor]

My gas cap doesn’t have a vent on it at all

 

[Steve73]

I’m not sure. I did adjust the float a bit and it did run better than before and I replaced the main jet. Maybe it’s still getting too much fuel? I’ll have to adjust the float again so the needle lets less fuel in the bowl at once

The drill bit thickness method is the perfect height to adjust to.

 

[Willbodor]

The drill bit thickness method is the perfect height to adjust to.

Yeah I’ll give that a try and see what happens

 

[Havasu Dave]

My gas cap doesn’t have a vent on it at all

The tank will be vented, or the fuel wont flow. I do think you are correct. There's probably a vent hose from the filler neck, so probably not the issue. Thumbs up for the drill bit adjustment. I'd forgotten that. @Steve73

 

[sparkwizard]

Is there any rust or dirt/sand in your tank? Can you look at the jet you removed and see it it's clogged? You should see light through it if you hold it up.