YY250T overheat By cranky68 (Read 1,868 times)

[cranky68]

Hello again, all;
Now that I am getting this beast up and running again, I have other areas of concern. Where can I find a new or rebuild coolant fan? I also remember reading somewhere on this site about typical overheat issues with the JMSTAR YY250T. If I remember, someone mentioned the fact that the fuel tank impedes sufficient airflow to the cooler. Is any of this true? What has anyone found to be a good work around for this?

[Cruiser]

Here's a good replacement fan that may save you a couple of amps in power:

www.siliconeintakes.com/product_info.php?cPath=15&products_id=1024&osCsid=2bf68d71e32fe413cbb745cbd96ddb55

There really is no work around for the restricted air flow problem short of adding an additional auxiliary radiator in front of the gas tank. Most of the overheating issues with the 250cc class of scoots can be traced back to poor maintenance of the cooling system and problems after refilling the cooling system. If the scoot has been sitting a while, then it is important to drain and flush the cooling system. The passages are small and can easily by blocked with corrosion and foreign matter.

A good quality 50/50 premix antifreeze should be used for the refill. Sometimes air trapped in the system can cause overheating and it can take several heating a cooling cycles to "burp" or remove any trapped air. This can be monitored at the overflow or expansion tank. Once the level remains constant when checking cold, the system should be free of air.

You can then determine if the scoot really has over heating problems after the cooling system has been properly serviced.

[nulldevice]

Jul 26, 2012 22:33:01 GMT -6 Cruiser said:

Here's a good replacement fan that may save you a couple of amps in power:

www.siliconeintakes.com/product_info.php?cPath=15&products_id=1024&osCsid=2bf68d71e32fe413cbb745cbd96ddb55

There really is no work around for the restricted air flow problem short of adding an additional auxiliary radiator in front of the gas tank. Most of the overheating issues with the 250cc class of scoots can be traced back to poor maintenance of the cooling system and problems after refilling the cooling system. If the scoot has been sitting a while, then it is important to drain and flush the cooling system. The passages are small and can easily by blocked with corrosion and foreign matter.

A good quality 50/50 premix antifreeze should be used for the refill. Sometimes air trapped in the system can cause overheating and it can take several heating a cooling cycles to "burp" or remove any trapped air. This can be monitored at the overflow or expansion tank. Once the level remains constant when checking cold, the system should be free of air.

You can then determine if the scoot really has over heating problems after the cooling system has been properly serviced.

More than a good quality andifreeze. Make sure it is for aluminium engines and is silicate free. Silicates will destroy the water pump seals and the wrong chemistry can destroy the radiator and motor.

[Cruiser]

Not many brands actually say they are silicate free because most brands are silicate free and they probably figure why bother? You can read the ingredients label which will help. Another feature to look for is the long life or extended life brands which state that they can be used with any antifreeze and can be used on any vehicle.

Prestone and Peak Long Life make this type of antifreeze along with Super Tech from Walmart and Advance Auto has their own brand.

[nulldevice]

If it doesn't say silicate free it probably isn't. Otherwise why would some brands bother to mention they are silicate free? You can go ahead and risk your motor's longevity on "most" and "probably" but I won't.

As you said, read the label and look for words indicating it is silicate free. I have a jug of full strength Prestone that has silicates, and a jug of 50/50 pre-mixed Prestone that doesn't.

[Cruiser]

The Prestone website does not mention silicates in any of their antifreezes. They also do not make a point of mentioning specifically that there are no silicates in their products. The concentrated Prestone and the 50/50 mix are identical in ingredients except for the addition of distilled water in the 50/50 mix according to the website.

They do have a Prestone Xtreme Sport antifreeze for motorcycles which also doesn't say anything about silicates.

So what can be deducted from this? Their products do have silicates and they don't want to admit it or none of their products have silicates and they decided to list what is in their products rather than what isn't?