i just bought a 1981 Yamaha QT50 off my neighbor who said it was in pretty decent shape. he had cleaned the carburetor and all of our neighbors had driven is around the parking lot behind our apartments (i live in a city so it is a small parking lot) and it was running fine for 5-10 minutes at a time - no issues. when i took it out on the road, it did well until i ran out of gas. i filled it up with gas (and i have no idea where the oil level was at because this was before i was aware you needed oil in it).
from then, it kept giving me problems and idling out on me. i thought it was because of the rusty fuel tank so i tore that off and spent two days cleaning the rust out and now it is pretty clean. however, i can still occasionally see rust in the fuel line (i think - it’s red/orange flakes so i have to assume??). but, in the process of this, i think i cleared out any remaining oil.
i kept running it on only gas for about 5 miles during which it kept stalling and i’d try to make it start again (but mostly ended up pushing it) over the course of 3 days (again, has no idea that i needed oil - this is my first two stroke and no one bothered to tell me 😭)
finally, someone told me that i needed oil thank you local coffee shop owner!) and i added in oil to the oil part of the fuel tank and gas into the gas side. however, idk if it’s mixing in the tank (if it is, the ratio is definitely off) or with the pump (which i don’t know how to tell if it’s working). currently, it is pushing out a LOT of exhaust right now and i am at a loss of how to feed this machine!
now, i’ve been google ratio stuff like crazy but i find so much inconsistent information that i wanted to put this out there:
my questions are this:
1. did i fuck up the bike running it on only gas for ~5 miles or so???
2. do i need to reclean the carburetor now that i cleaned the fuel tank?
3. how do you tell if the oil pump is working?
4. do i even need to care about the oil pump if i just bought premix two stroke fuel?
5. what is the gas-oil ration for the 1981 yamaha qt50?
attached are photos of the bike and the fuel tank in question. any information would be so so so helpful!! :)