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Vehicles & Servicing Scooter Overheating

Discussion in 'Businesses - Services - Products' started by PatO, Jan 25, 2023 at 11:19 AM.

  1. PatO

    PatO DI Forum Luminary Highly Rated Poster Showcase Reviewer Veteran Marines

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    I gave my fathe-in-law my old Yamaha Mio scooter and it is overheating now. Neither one of us are mechanically inclined. Any suggestions what the problem might be? Thanks
     
  2. Dave_Hounddriver

    Dave_Hounddriver DI Forum Patron Highly Rated Poster

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    OK, this is probably stating the obvious, but did you check the coolant level?

    Yamaha's fastest automatic MIO motorcycle is powered by cutting-edge technology and superior functional equipment. Its superiority is boosted by being the only 125cc AT unit with a liquid cooled engine
     
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  3. OP
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    PatO

    PatO DI Forum Luminary Highly Rated Poster Showcase Reviewer Veteran Marines

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    I had the first Mio in Dumaguete. I will tell him to check liquid lrvel. Thanks
     
  4. Crystalhead

    Crystalhead Forum Patron Admin ★ Moderator ★ ★★ Forum Sponsor ★★ ★ No Ads ★ Highly Rated Poster Showcase Reviewer Veteran Army

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    If the Scooter has multiple gears (after checking coolant, oil levels and ALSO AIR FILTER cleaning) tell him to change gears at low RPM. If doing all the fore-mentioned and it still heats up, take it in for repair and get piston and valves cleaned & or polished. I have had 10 Motor-Cycles (never owned a scooter) to date but kinda know dis stuff. Cheers!
     
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  5. cabb

    cabb DI Forum Patron Highly Rated Poster ✤Forum Sponsor✤

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    There are three things used to help cool engines, it's either air, coolant or oil.

    I'm not aware of any vehicle where oil is solely used, although it could be I guess, but to my knowledge it is only to supplement air or fluid cooling. Oil also serves as a lubricant, so it it's not circulating it can cause heat to build up due to friction. I doubt the scooted has an oil cooler. Check your oil level. If oil isn't lubricating you can cause lots of damage to the engine. I'd guess a scooter is gravity fed.

    Air is pretty straight forward, either it is the normal flow of the air caused by movement or forced by a fan. If you don't have liquid cooling, clean the cooling fins, maybe caked in mud and verify someone didn't get creative and cover the cooling fins, typically on the head. Other than the fan failing or something impending the flow of air it's a very reliable system.

    It sounds like this scooter may have a fluid cooling system based on a previous post. Coolant is typically routed through a radiator to transfer the heat to the air to cool the fluid. Things to check here would be the fan, if it not just cooled by air flow over the radiator. That the radiator is clear of debris. Many fluid coolant systems have thermostats to regulate the temperature of the engine. In cars, they occasionally need to be replaced, so check the thermostat if it has one. In addition, there is also a water pump to circulate the fluid through the system, so verify your pump is working. Check for clear airflow over the radiator. Lastly, make sure you are using a good cooling fluid mix of water and coolant.

    If you have to get into the engine (heads/cyclinders/valves), serious damage has probably already been done.
     
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    Last edited: Jan 26, 2023 at 10:51 PM
  6. Mike_Haddon

    Mike_Haddon DI Member

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    All standard Mios are air cooled - mine is. Not sure which, if any model is liquid cooled. It's fully automatic, so you cannot change gear selectively.
     
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