Ok need help with a 150cc gy6 engine on a very strange issue please try to answer all questions and thanks in advance 1. ok when i drained the oil and went to add new oil on the center stand it would only take 10%of the oil?? then the next 10% would go in very very very slow and then it just backed up and sat in the resevior it would not go down???? 2. i put the scooter on its side kickstand and low and behold the oil went down it burped a little on its way in but it went in is this normal??? 3.i ran the engine for 10 min at idle the turned it off and immediatley went to remove the dipstick and there was a prssure sound like speewww and then oil spewed out of the resivor slowly with light bubbles in it? is that normal?? thanks so much for helping me i really apprecitae it AND I REALLY NEED TO KNOW IS IT SAFE TO DRIVE!!! THANKS

SOURCE: ok need help with a

Hi
Great I've got you again
I just posted this comment
I asked as you said it 'backed up and sat in the reservoir'. do you mean the crankcase filler hole?
These engine are notorious for having to have the oil poured in very slowly as it has to go through a very small hole & they can easily overflow, it is normal for the level to go down when placed on side-stand

The oil coming out of the filler hole under pressure (with bubbles) is due to the crankcase pressurising, this is usually caused by one of two things
1. A kink or other restriction in the breather pipe; this can easily be pinched when putting the seat compartment back on or by wrong routing, it goes from the cylinder head to the air-box
2. The piston rings or cylinder bore are extremely worn & therefore let pressurised fuel mixture back into the crankcase

I think no.1 applies

Ride Safe
Bike-Doc

I hope this answer is acceptable

I only meant to ask for clarification but must have posted it as a solution ( which you have rejected )

SOURCE: CAN SOMEONE PLEASE ANSWER MY

no its not normal,,, for your questions..they are all linked so i will answer each of them together..

The oil resevior has a blockage,, this is what causes the back pressre sound as well as the spewing.. This will also account for why the oil didnt go in normally.. This is usually caused by 1 or 2 things...

1.) wen you were adding oil something got down there with it and jammed / semi- jammed the inside..

2.) the parts in the engine are shaving ,, this is when the outer coating begins to fall off which is normally caused by 1.) wrong oil type 2.) running the engine will little or no oil, particles in the oil..

Now with that siad,, get your self an engine treatment,, the kind that you pour into the engine, run it and it should dissolve the particles and free the system,, drain it then add new oil...

If that fails then you will need to replace the engine or have it serviced / repaired,, This involves taking it apart,, replaceing components and putting it backtogether... You can also run it as is unit it goes..