air in cooling system By tavcor (Read 556 times)

[tavcor]

hi guys yesterday my jonway master 2 for some reason start to heat up above 3/4 mark I've let it cool down opened the caps overflow bottle was full no mix of coolant i've refilled and start to burp it fan comes on but constant bubbles looks like it comes from the other pipe on the filler neck that go to the carb. What's the function of that pipe can it be blocked of?

[richardthescooter3]

Hi tavcor, At one time they hook to carb because of colder climates to keep carb warm, not necessary anymore, my carb has the same hook up, but not hooked up.

[tavcor]

Rich I blocked of that pipes last night burp it what a mission itl was. Sometimes I get the scoot to be perfect for a week and I use it everyday to work but then it would start to overheat again. What I noticed when I srtuggle to burb it the hose from filler neck to radiator would stay bone cold and that side of radiator is cold too in comparison to other side is it normal

[alleyoop]

The top hose where it connects to the motor is where your thermostat goes. If it is heating up and that hose is cold that means your thermostat is not opening and letting out the HOT LIQUID out to the radiator to be cooled off.
Alleyoop

[tavcor]

Ally the one from fillerneck to radiator is cold when I burp the scoot is it normal

[ellpee]

Apr 8, 2014 23:14:20 GMT -6 tavcor said:

Ally the one from fillerneck to radiator is cold when I burp the scoot is it normal

That confuses me. Alley's talking about a largish, maybe 5/8"?, hose from the top of the MOTOR to the radiator, that should, when the engine has been running long enough, get hot as the thermostat opens and hot coolant begins to be pumped back to the radiator. It sounds like you are talking about a smaller hose, like 3/8" or so, that runs from the filler cap under the seat direct to the radiator. Also not sure what you mean by "normal."

Just asking, 'cause if I'm unclear what you're saying, others trying to help you may be confused as well.

[tavcor]

ellpee i am talking about the one from filler to radiator. ride it to work (16km) today gauge stayed half. from work back to home it went up to 3/4. after i've let it cooled down at home burbed it again then that hose was luke warm i suppose that's better, but after maybe and hour of idling and coolant top-up. the bubbles wont stop it keeps on coming. i could not find any leaks and coolant looks good oil looks good no performance problems. if i can just get the source of the air surely after an hour the the coolant should have settled down it moves up and dispensing bubbles. i even continuously pressed the hose coming from thermostat to radiator bubbles wont stop.

[tavcor]

Hi this weekend my scooter did it again overflow bottle full and overheating the by the way its a 244 engine. The radiator cap is the 0.9 whitch is a 13.5 psi if in correct but the manual say it should be a 15 psi cap for that scoot so I,ve put a 1.1 cap on whitch is 15.9 psi. Burp it ride to work and back no overheating overflow stays half full. Left it stand for a day no riding or idling to get it bone cold but when I open the cap water out a lot of pressure in the system is it normal or will the stronger cap cause more harm then good

[ellpee]

THIS is what I've been trying to clarify, and apparently not doing a very good job of it. Of course this is my Roketa, may or may not be the same on other scooters.

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[jburd]

Ellpee, I have a JCL MP250A and it has the same connector you are showing. The small tube going on the back (pointing down on your pic) on mine goes to the rear top of the radiator. I have noticed when burping my cooling system, I get air bubbles from 2 places - some come up the main tube going to the radiator and others come from the small tube in the back also coming from the top back of the radiator.

Tavcor, if you have continuous bubbles coming up, you have a leak somewhere. Some air is getting in your cooling system somehow. Do you see any coolant leaking anywhere? I had the same symptoms on mine. When burping, I had continuous bubbles. They never stopped. Mine would run fine and the heat gauge wouldn't go above half, then all of a sudden overheat and build up pressure and flow coolant back through the overflow tank. For me, my problem was the head gasket. Even though I didn't have oil in the coolant or coolant in the oil, (at least didn't see it anyways) the pressure from the combustion chamber was bleeding back into the coolant. Hopefully yours isn't that. But in my opinion, somehow air is getting in.You shouldn't have to keep burping it. I ended up replacing everything but the radiator in mine. I bought a new thermostat, radiator cap, new hoses, and finally a head gasket. I even did a coolant system flush. That might not be a bad idea to start with. That's cheap and easy.