My Aerox 155 is suddenly going off while riding. i have to start again,what could be reason

[New Guy]

Help will be appreciated.

[johng]

What do you mean by "going off"   the engine dies ?   have you checked the engine oil ?

[New Guy]

Yes, the engine dies. changed engine oil, gear oil and coolant

[SAFETY FIRST]

8 minutes ago, New Guy said:

 is suddenly going off while riding

Sounds like my girlfriend. 

 

She suddenly goes OFF, while I'm riding her. 😎

 

[New Guy]

haha...mine is serious especially druing highways.

[connda]

Take it to Yamaha and let them figure it out.

[scubascuba3]

maybe auto idle off switch? if not that ask the garage

[johng]

36 minutes ago, New Guy said:

changed engine oil,

Did you change the oil before or after it started "going off"  if the engine was starved of oil then it could have damaged the valves and piston/rings  leading to engine cut outs (seizures) after the engine gets a bit warm  low power and continued loss of engine oil leading to more damage and eventual complete failure   top end overhaul costs around 3000 baht ++++  depending...

[Issanman]

Clogged fuel filter?

[KhunLA]

9 minutes ago, Issanman said:

Clogged fuel filter?

Ah yes ... simple, easy & inexpensive things ... first.

 

If not that .. off to the Yamaha dealer.  Though I hate working on anything, so dealer would be my first stop

[New Guy]

Before the oil change and after the oil change it has happened.  Once it starts running nothing happens. This happens sometimes only. 

Thank all of you for the help.

[watchcat]

3 hours ago, johng said:

have you checked the engine oil ?

 

I think this type of bike inhales gasohol, not oil.

[BarraMarra]

Nothing to do with oil that's just the lubricant if it starts engine is fine no mechanical damage. sounds like your accidentally hitting the idle switch. if you brake to a halt the bike will stall.

[SAFETY FIRST]

3 hours ago, New Guy said:

Help will be appreciated.

It's a New Guy thing. 

 

Problem will go away soon. 

 

[johng]

1 hour ago, BarraMarra said:

if it starts engine is fine no mechanical damage.

Not true,  I've had the run out of /low oil problem with my stepdaughters scooter   she would complain that it's "sticky" or "lethargic"  I took it for a quick spin and it seemed fine to me  but it was because the engine was cold  when the engine got up to temperature the problems start  eventually it would not start at all because the piston was totally scored  no compression.

top end rebuild x 2  because she didn't monitor the oil level after the first rebuild..yes the mechanic doing rebuilds not so diligent...anyway a brand new Honda Wave solved the problem 😋

 

1 hour ago, BarraMarra said:

sounds like your accidentally hitting the idle switch.

Yes highly possible or some electrical fault  causing the idle cut out to cut in... don't know if applicable to this bike but there could also be a cut out switch on the side stand.

 

2 hours ago, watchcat said:

I think this type of bike inhales gasohol, not oil.

Every engine that inhales gasahol (internal combustion) also requires oil if it wants to live a long life.

[New Guy]

For example, I will start the bike and pull the accelerator.  After 2 to 3 minutes of travel, the bike will slowly stop. Once I started the bike sometimes it accelerated too fast to meet the previous speed and sometimes these issues did not happen.  These happen sometimes only.  MY aero 155 has a "start and stop switch", which I always keep on start but no indication is showing on display. 

 

 

 

 

[johng]

3 minutes ago, New Guy said:

After 2 to 3 minutes of travel, the bike will slowly stop. Once I started the bike sometimes it accelerated too fast to meet the previous speed and sometimes these issues did not happen.  These happen sometimes only

Impossible to diagnose from that   please take your scooter to the nearest Yamaha dealer/service centre and ask them to fix it.

[New Guy]

Thank you for the help.

 

 

 

 

[scubascuba3]

11 minutes ago, New Guy said:

For example, I will start the bike and pull the accelerator.  After 2 to 3 minutes of travel, the bike will slowly stop. Once I started the bike sometimes it accelerated too fast to meet the previous speed and sometimes these issues did not happen.  These happen sometimes only.  MY aero 155 has a "start and stop switch", which I always keep on start but no indication is showing on display. 

 

 

 

 

If it happens whilst at speed it won't be the idle start stop switch. If it happens when you stop then it might be

[briofoz]

Dirty fuel. Did you fill from bottles?

 

Spark plug 

 

Loose Spark plug connector.

[Foek]

Can be start sensor or your stator coil, bring the bike to yamaha while it still drives.

[graeme72]

Had a similar problem with a Honda Moove, riding along then it died, when it stopped it would start again, then repeat further down the road. It was the throttle position sensor, so replaced it and everything was good, until it happened again. This time it was the idle stop switch, just switched it on/off a few times and it's good again. Now I switch it on and off a few times every day and no problems so far. You need to take it to Yamaha or a competent mechanic with a computer code scanner.

[CANSIAM]

Check your idle switch, but usually the bike will shut down when stopped not moving and idling if it's on..... 

[MadMuhammad]

The main seals on both sides of the Aerox engine are known for deteriorating and leaking into the cases. 
On the right side is the stator, mine got gummed up with oil and dirt and started randomly switching off while riding 

 

2500 at the shop and a new stair was swapped in.  I issue since 

[New Guy]

went to yhamma shop and they just check the display and said i need to change seal (picture that you have uploaded). 

[thailand49]

 

clarification more info

 

Say when riding?  You going down road all of a sudden engine cuts out if that happen then what you do?

No indication you cant start up again?  If it doesnt should be a quick diagnose from shop.

Does the engine cut off at a stop?

My bag should have read more, dont sound like Idle, I looked at the 155, like the big tires but always had Honda based on your problem I'll stick with Honda. Had a Click.  12 years now my PCX, 125 plus KM, no major problems.

 

[New Guy]

engine cuts off but when i restart it works again. At the shop everything was fine. The technician at Yhamma dealer that i went to check didn't do anything at all, i told them about the problem and they told me to change the seal. There was no using of a computer or software run to check anything. Within 2 minutes they figured out the problem. They said my aerox 2109 model has an older version of seal with short length of wire but the one they are replacing has a long wire and it is the new version. They even said all the bike that are out now has a new version and mine is an older version. 

so i was a bit skeptical about it and asked another workshop, some said it was a wiring problem, and others said throttle switch problem. so, I'll go to another Yhamma dealer.

[BTB1977]

It's a Yamaha.  Life expectancy of only 5 years.  

[dddave]

Though the OPs problem was apparently  solved, I'll post this anyway.  A rental was cutting out and stalling randomly.  Turned out the kickstand kill switch that turns the bike off when the stand is extended was defective and road bumps would actuate it.

[shdmn]

3 minutes ago, dddave said:

Though the OPs problem was apparently  solved, I'll post this anyway.  A rental was cutting out and stalling randomly.  Turned out the kickstand kill switch that turns the bike off when the stand is extended was defective and road bumps would actuate it.

That could definitely be a tricky one to figure out.