Question about Yamaha Agusta F4 R312 1 plus 1 Motorcycles

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Scooter tuns fine until left in the sun. I know that mine had a recall on the fuel pump seal and that has been taking care of except the problem still occurs. I have taken it and it is currently at the Yamaha dealership and they have rechecked the fuel seal and fuel pump and problem still exist. - When sitting in the sun for an extended period the scooter will usually not crank. (electrical gauges and everything do come on) - If the scooter does crank it will stall out immediately when given gas.

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  • Yamaha Master
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Hi, Jltaylo7176 some bikes get "Sun Stroke" after running fine in the morning then shut off and parked in the sun for a couple of hours on a hot day. You get back on the bike hit the starter button and nothing happens or the engine turns over but will not fire. Then you put the bike in the shade for 20-30 minutes and it fires up no problem.
The primary reason for this phenomenon is faulty wire connections in the Starter and/or Ignition Circuit. You may have a wire connection/component that makes just enough contact when cool to start and run the bike, but when parked and exposed to direct sunlight heat causes expansion and creates an "OPEN" in the circuit not allowing the bike to start. You move the bike into the shade for a few minutes, the temperature goes down allowing the connection to contract and make better contact and suddenly "it's a miracle" the bike starts. I know what you're thinking that Gremlin could be anywhere, and you would be right in that assumption, you can take your bike to a dealer, spend tons of "DRACHMA" only to receive validated nervous emotions the next time you park in the sun, then 1 week later it doesn't start. Start by doing a ground check:
Check the battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary. Check all common grounds for the same suspects.
The secondary reason your bike may get "sun Stroke" is vapor lock although this is a rare scenario it does happen.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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Posted on May 23, 2017


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: Hard to start when engine warm

crankshaft sensor may be going bad

Posted on Aug 09, 2008

  • 6966 Answers

SOURCE: Battery location on scooter

Hi and welcome to FixYa,

Appreciate the direct "Ask Me".

Initially, have to inform you, have not worked on one. Being in the Philippines most that I have laid my hands on are Japanese with a sprinkling of Italian but don't recall ever working on a French scooter. Sorry.

Still as you posted "Any advice...", allow me to do some guesstimate:

  • most scooters would have the battery located low;
  • would not be more than 50 cms away from the starter motor/engine;
  • being a 125 engine, battery would have to be about 7A/H, a bit heavy, therefore battery holder would not be on any of the plastics, chances are to the frame;
  • likely to be under the seat but there would be the helmet compartment, so maybe lower.
With the above assumptions:
  • either under the helmet compartment front of the engine (but would have an easy access panel/lid; or
  • under the footrest/floorboard.
Pls update how close or how far, curious myself. Good luck and Thank you for using FixYa. Happy New Year.

Pls be informed that due to my current rank and rating, even a Helpful would be detrimental to my status. Should this solution not address your concern, it would be appreciated if you could just not rate it at all. Cheers.

Posted on Dec 30, 2008

  • 56 Answers

SOURCE: Scooter won't start

I think you need to take it to your local scooter shop and have the carburetor cleaned and the spark plug changed ask to have the routine service done

Posted on Feb 03, 2009

  • 7 Answers

SOURCE: Odyssey 4-wheel electric scooter - The following

Always check the battery connections first because too many times it is a loose connection or battery bolt. it would happen more if you drive it a long distance, or up a hill and the controller over heats or if you are hitting a bump. when the controller cools down it drives again.

Posted on Mar 10, 2009

  • 2002 Answers

SOURCE: electric scooter won't start

you must completely discharge your battery and recharge it three times (you see your battery has a "memory" and, charges half way less each time you charge it) so doing this will "reset" it unless you "burned it out"

Posted on May 05, 2009

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