Sym simply 50 starting problems By lee12345 (Read 68 times)

[lee12345]

Hi all,

My son has just got a 2019 sym simply 50, it worked fine with the electric start for a while but now only kick starts.
 I have taken the console off and see both brake switches go through the same wires, I also looked at the wiring schematic and do not understand how the starter circuit tells the difference between brakes. 
With power on, engine off, the front brake handle illuminates the brake light but the back brake handle does not. 
I tried shorting the switch but it still did not light the brake light. 
The back brake switch must be working otherwise it would not kick start.

Can anyone suggest where else to look? I'm new to mopeds so please talk to me like a two year old😁

Thanks for any help/suggestions 

Cheers Lee... 

[classacted]

I like to talk to people like adults.
there are wiring diagrams all over the internet and every forum has a well written tutorial that targets your specific problem. I strongly suggest spending an hour or two studying this info.
it sound to me that your issue is NO CRANK.
if it starts by kicking it over, your problem is not a starting problem.
this is in regards to a NO CRANK problem. if I am mistaken, disregard my post below or clarify.
you don't tell us how much voltage your battery has. that is the first place to start. you need a tester to test battery voltage at rest (not running), and running/charging voltage.
here's two quick and dirty tests:
1. after you turn the key on, put a metal object between the two top posts of the starter relay. if you're lucky, the engine will turn over. that's a good sign for the battery and suggests the starter relay may be bad so continue to #2.
2. one of the two wires that go to the starter relay comes from the battery positive (through switches). the other is ground. jump a wire from battery positive to the wire waiting for the positive electricity (at your own risk).

[lee12345]

Hi Classacted.

The two year was meant as a joke/please explain very clearly.

The battery voltage is fine, first thing I checked.

I have searched but can not find anything telling me why one brake switch lights up but the other doesn't.
I know the system work together but looking at the circuit diagram I can't see where back brake and front brake split to enable the starter circuit.

I will try shorting out the starter to see if that works.

Cheers Lee...

[classacted]

I knew it was a joke, and I was joking too.
I have two chinese scooters and they are wired like this:
the positive electricity comes from battery positive and goes through the key switch when the key is on. one wire splits into two going to each switch and it waits there for the handle to be squeezed, so left, right, or both handles can be squeezed to achieve the same result which is positive electricity arriving at the starter button. now you push that starter button and the positive electricity arrives at the starter relay which should cause a connection of the two posts.
as for one switch working different from the other, one could have corrosion or a break and the other does not. I know first hand that those switches are unreliable. the start button and the key switches are much better. consider bad contact at the connectors and the bulb too.
let me know.

[lee12345]

Thanks, it won't start with the front brake applied? I've tried shorting the start button as well. Think it might be a combination of problems or just one loose wire. He is using it to go to college so I don't want my messing around to make it not work at all.At least it kick starts so he can get there and back.

Thanks for help.

Cheers Lee...

[classacted]

did you ever try these?
1. after you turn the key on, put a metal object between the two top posts of the starter relay. if you're lucky, the engine will turn over. that's a good sign for the battery and suggests the starter relay may be bad so continue to #2.
2. one of the two wires that go to the starter relay comes from the battery positive (through switches). the other is ground. jump a wire from battery positive to the wire waiting for the positive electricity (at your own risk).