pcx 125 wont start if it is warm

[Belavrin]

Hello@all,

i hope to find some hints or answers herer because i have no idea what my pcx is doing.

My pcx is a 2015 model and worked perfekt until the end of this winter, i killed the batterie so i bought a new one and all was fine. SInce 3 weeks my pcx wont start if the machine is hot or was standing 8 hours in the sun. It s trieng to start (you can hear teh copmpression of the cylinder) but it is not coming. So i changed the spark and it worked better for 1 week since yesterday it is the same.

If the PCX is standing over night or not in the heat it starst perfekt but if i drive a bit and go shoping for 5 minutes it wont start any more, if i wait some hours it starts.


I have no idea what this can be, could it be a cocke problem ? i mean that the air fuel mix is wrong whe it is too warm ?

i would appreciate any help.

best regards
Alexander

[easyrider]

Possibly vapor locking.. Fuel pressure regulator stuck ???

[fish]

How many miles on your scooter?
How long ago were valves checked - if ever?
Fish

[springer1]

Take a ride thats long enough to heat everything up completely. Then try restarting the engine immediately after shutdown - not a few minutes later - immediately after you turn it off.

If it does restart immediately after shutdown - but does not restart after a few minutes later - after baking a bit- then it may be an ignition circuitry issue or a fuel related vapor lock situation or etc - that had time to develop due to the heat buildup in those few minutes of baking without any cooling airflow.

[Brandemihl]

What did this end up being? I am having the same problem. I get a spark though.

[Brandemihl]

How many miles on your scooter?
How long ago were valves checked - if ever?
Fish

I have the same problem. 4K miles on mine. I checked the valves a few weeks ago. Exhaust perfect. The intake were tight, because I didn't have feeler gauge the right size to start. My gauge is .13mm. Max w/ tolerance on bike is .12mm. So I believe the valves are actually in.

Thanks!

[valdemordor]

Hello to everyone! Has anyone solved this? It's happened to me twice this summer. Both times I left my pcx outside in the sun for a log period then it didn't start. I thought it was a battery issue but once it cooled down in the shade, the pcx started just fine.

[bertzza]

Hi.

I also have this issue on my PCX150 on a warm day where the bike has been sitting in the sun. It has also occurs on a hot day when in the shade so I am confident the issue is a Vapour lock as it sorts itself out once the weather has cooled down.

Has anyone found a fix for this yet?