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Wayne S.
Wayne S., Motorcycle Mechanic
Category: Motorcycle
Satisfied Customers: 1255
Experience:  Experienced and Licensed Motorcycle Mechanic - all sizes and brands welcome.
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Kymco 49.9 cc moped tacks up fine with kickstand down as soon

Customer Question

Kymco 49.9 cc moped tacks up fine with kickstand down as soon as you put the kickstand up she dies HELP can't figure it out
Submitted: 1 year ago.
Category: Motorcycle
Expert:  Wayne S. replied 1 year ago.
Do you have a kickstand switch on it?WS--
Customer: replied 1 year ago.
No
Expert:  Wayne S. replied 1 year ago.
Is the kickstand touching any wires when it goes up
or disturbing anything that would shut the engine off?
--
Customer: replied 1 year ago.
I've looked and looked for a line or wire and I can't see anything!
Expert:  Wayne S. replied 1 year ago.
If there are no wires then the kickstand is just
a mechanical device with no way to shut off the
engine unless it is touching some other wires
or device when it goes up.
Could it be some other thing like a brake switch
that is acting up when you flip the stand?
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Customer: replied 1 year ago.
is the switch internal
Expert:  Wayne S. replied 1 year ago.
I am looking at a wiring diagram and it shows no
switch but they may have added one at some point.
The switch would be near or on the bolt that holds the stand.
If it has a switch then that could cause your problem
otherwise it has to be something else.
Does it quit when you lean the bike one way or the other
without touching the stand?
----
Customer: replied 1 year ago.
No had it laying down and running and there's no kickstand switch! Would a brake switch react to the kickstand up without any wires or sensor it doesn't make sense :/
Expert:  Wayne S. replied 1 year ago.
No it doesn't really make sense but weird things can happen
sometimes that seem mysterious. There is usually a reason
but finding it takes some careful testing.
I wonder if there is a switch hidden somewhere or some
wires or a ground to something that is being
disturbed. It runs when on the stand so something
is different when it's off the stand.
Are we talking about a center stand or a side stand?
----
Customer: replied 1 year ago.
So kickstand is down and when you sit on it the scooter is dying as well! As soon as that back tire hits the ground she's just dying
Customer: replied 1 year ago.
Center stand and we can't put any weight on it with the kickstand up or tack her up with that back tire on the ground with the kickstand up I'm going to have to tear it apart and try and find it it is absolutely driving me insane
Expert:  Wayne S. replied 1 year ago.
Oh now that opens other possibilities up.
When the suspension is compressed it is disconnecting
your wiring somewhere. I suggest checking the
wires to the ignition coil and other connectors.
Also look under the seat for loose or bare connectors
or wires that have pulled out of a connector.
I think I have seen this before, definitely some
wires being disturbed by your rear suspension
moving upward when you put weight on it.
You might have to remove some body panels if necessary
to inspect the wiring closely.
-----
Customer: replied 1 year ago.
That was my initial hunch have checked everything I've even checked wiring and all lines NOTHING I've one by one pinched of lines and wires with my hands to see if the compression from weight was causing the shut off but to no avail! I'm lost
Expert:  Wayne S. replied 1 year ago.
Check the spark plug wire and cap too as it might be
pulling that apart.
There has to be some disconnect in something or a short
circuit when the suspension moves up. Check the wires
coming out of the engine or stator area for pinches
or loose wires. Could be right close to where the
wires exit the engine case.
Let me know how it goes and if I find any helpful info
I will post it for you.
----
Customer: replied 1 year ago.
If I pulled the spring out of the kickstand and we can't get the ignition to respond does that kind of confirm a sensor or switch in the kickstand
Customer: replied 1 year ago.
Never mind the wires to the battery terminal broke that's why the ignition wouldn't respond ok so I appreciate your effort but I guess I'm on my own thanks again I'll let you know when I figure it out
Expert:  Wayne S. replied 1 year ago.
Yes, if anything changes by removing the spring it might
indicate a switch somewhere. You should be able
to see a switch or wires if you tip the bike over to get
a good view. I have heard of other owners with this
problem but they never posted any definite fix.
I think one guy said it was something to do with the
ignition coil or the wiring to it but could be
any part of the wiring system at fault.
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