Post by raywoc on Sept 12, 2016 12:01:05 GMT -5
Over the summer, i have been trying to get my dad's 1998 50cc Italjet Velocifero up and running. It has been out of commission for probably close to 10 years or so. I think I have it going for the most part. However, I am having trouble getting fuel to the carb.
So far, I replaced the tank-mounted petcock because it was leaking, removed and cleaned the carbureator, replaced both the fuel and vacuum lines with new tubing.
Now, if i suck the vacuum line, the petock operates and the fuel flows to the carb. I can then start up the engine and it will run pretty smoothly until the fuel in the carb gets used up, and the fuel is not replenishing from the tank. It seems like to me that the carb is not generating enough of a vacuum to operate the petock.
I did a compression test, and it's getting 120-150psi pretty consistently, so i dont think it's the piston, rings, or head gasket. Would the lack of a vacuum be a symptom of a leaky intake manifold? How do i test the vacuum that's supposed to be sucking on the carbureator?
And i would love to replace the petcock with a gravity-fed, manual valve, but i am not sure how to do this since the petcock is attached to the tank.
I am kind of at a loss and am banging my head against a wall.
So far, I replaced the tank-mounted petcock because it was leaking, removed and cleaned the carbureator, replaced both the fuel and vacuum lines with new tubing.
Now, if i suck the vacuum line, the petock operates and the fuel flows to the carb. I can then start up the engine and it will run pretty smoothly until the fuel in the carb gets used up, and the fuel is not replenishing from the tank. It seems like to me that the carb is not generating enough of a vacuum to operate the petock.
I did a compression test, and it's getting 120-150psi pretty consistently, so i dont think it's the piston, rings, or head gasket. Would the lack of a vacuum be a symptom of a leaky intake manifold? How do i test the vacuum that's supposed to be sucking on the carbureator?
And i would love to replace the petcock with a gravity-fed, manual valve, but i am not sure how to do this since the petcock is attached to the tank.
I am kind of at a loss and am banging my head against a wall.
