Modern Vespa

I have an ET2 50 that I bought a few months ago and go it running. The bike was sitting for a while before I got it. In the process of trying to get it running I did empty the 2 stroke oil and changed it. I want to make sure oil is being injected to the motor. I was going to pull the small oil hose off the carb and make sure I got oil pumping out that tube. My question is would this be the best way and how much would I see flow?

How did you drain it? As long as you didn't get air in the line should be OK. Pulling the line for a visual is a good idea, just need to premix some gas.

The bottom oil connector was leaking so when I changed the o ring I drained oil from tank. Nothing was done to the oil in the lines.

Yup, that works. There is more than one way to go about this.

One option is to do it with the engine off. Just pull spark plug cap, pull vacuum hose from fuel tap (so you don't flood it). Then hold throttle open and crank it over while watching the hole in the oil hose. At first you might see nothing (especially if there is an air bubble in the line) but then it will start to "glub glub" out the end in little teeny bits.

*note, this will wear your battery down a bit. Make sure you have a good charge to start.

You can also do it with the engine running - I have. But either you'll want to premix for a prolonged test with the oil hose disconnected, or you will want to pull the hose, watch, and replace promptly for the motor's safety. Since it pumps slowly, you might miss the pumping action if you replace the hose too quickly out of nervousness (it's really not that dangerous, though - the engine won't suffer from a brief period off the pump as long as there is some lub in the cylinder already)

If it's been sitting for a while, you can premix a bit of gas, add about an ounce per quart. That will get you through the point where any air bubbles in the lne will have gone through the system. By premixing and making sure the premix has worked it's way into the carb and that's what you're burning, you can test the oil pump by pulling the line off at the carburetor, and counting the drops per minute.

It should be 3-4 drops per minute at idle, 5-9 at 4000 rpm and 8-12 at 7000 rpm.

If the pump is working fine, you probably don't need to do it now, but it might not hurt to change the oil pump belt when you do the variator and rollers.

The bike is a 2001 but only has 580 miles so not sure on the belt. It would not have a lot of wear but has years on it. Thanks everyone for the great info. Lots of options.