Accidently put in straight gas instead of fuel mixture. What to do?

Question

My housemate took my 1978 Columbia moped (47cc 2-stroke) out for a ride last night, and thoughtfully decided to gas her up before returning it...but put in straight unleaded instead of the fuel mixture. He rode it a good bit after this. What did he do to my engine? And what should I do now?

Answer 1

Add some oil to what's left in the fuel tank, and make the mix a bit "oil rich", now and for the next couple of fuelings.  If it's still running okay then, you've dodged the bullet.  Good luck.

Answer 2

figure how much gas is in the tank{unmixed he added} then add the proper amount of oil. It is better to add to much oil instead of not enough{cheaper to replace a fouled plug then replace an engine}.

Answer 3

if driven without the proper oil mix you will cook the top of the piston.not good.mix it with a little more oil for the next two tanks and keep your fingers crossed.the oil pump on my snowmobile quit last year and my pistons dissinegrated in the cylinders.

Answer 4

the oil is to lubricate everything in the engine if u ride it it could blow up or just lock up

just drain the gas and replace it with pre-mixed  

u might want to take it apart and make sure it is not damaged (piston, cylinder, etc.)

Answer 5

He probably didn't hurt anything since there was still some gas/oil mix in the tank, and he just diluted it. If it still runs fine and doesn't rattle, don't worry.

Answer 6

Try (like was said) to adjust the gas in the tank. If he drove it home and it still started it is most likely fine. ALWAYS add a little extra oil because it is better than not enough in a 2 cycle. That is the only lubrication the engine gets.