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Thank you for your replies, I have to stretch it again somehow to see what happens. I will let it on the Double stand alone to work Until the radiator comes on to see if it's gonna get hot again, I can do lot of stuff by my self so I have to check everything again. But one thing is for sure if the problem persists I will have to go the bike to a different technician to get a 2nd opinion.
It's my fault that I didn't go to a different technician from the start.

Today the radiator was working again Fully open because I can hear it spin really loud the temp was fine turned off the engine and let the radiator work until it stops. Stopped after 1 min. Next thing I will do is to let the radiator work with the engine On to see what happens then.

But I have a question.... how it's possible to have air in the system if the radiator cap is open with the screw air  radiator under my seat(this screw if you remove it suppose to release the air) I mean if you see water comin out of the screw under your seat for some time this means that there is no air inside your system am I right?

Hello everyone I'm new in here!

So I will get into the point right away.

I'm from Greece, so it's summer..... Temperature hits 37+ here on the island where I am so... This problem started like Last summer, I was getting over heat engine after 7+ KM of cruising not necessarily in traffic and the bike would throw off the waters from the Left side, I went to my bike technician to see what was wrong, He said back then that the problem was the TAP of the radiator it wasn't closing good enough so that was causing overheating..... Then winter came in had no problems at all,

1 month before my engine when Overheat again.... Stopped the engine right away pulled over checked the can with the water and it was empty...... Strange really strange I filled it with tap water opened the screw for the air to fill it with water so I was sure I haven't any air inside. I started the engine and something was leaking from the engine somewhere under the seat, I removed the seat and I was losing water from a faulty hose water, I tried somehow to stopped it and went to technician again to change oil, water and the hose. The technician said he stretched the scooter no overheat issues and nothing..... so I guess everything was fine.

2 days before, went into town(I'm living 5 km outside of town.) was 37 outside TRAFFIC and traffic lights I did my 1 min job and  and I was getting back to my home right away (so the scooter was working for like 20-25 min). I was hearing the radiator working I was touching with my leg the left side where the water flows and the outside plastic was really hot, I was aware right away to checking the temperature to see what happens.
Temperature Hits red.... released the gas continued for 2 sec.... it gets back to normal..... I continued after 200 metres it gets red again I pulled over turn of the engine waited for like 3-5 min to get cool then I started again with a normal temperature no water spilled this time. I said maybe it's just the temperature but it shouldn't do this because the radiator is there for some reason lol.
Forgot to mention my home is uphill somehow not straight.

Sooo I don't know what else to really check maybe it's the thermostat and it's not opening the radiator when it supposes to open it and it can't get it cool enough, tell me your thoughts.
Kymco 300 People 2011 38k Miles every service on time, also the OILS have good color and the water is fine.

Sorry for the long post but I wanted to give you a full  review.