LX 125cc start and idle problem

[motoman]

The engine is hard to start, even when the temperature isn't below about 7 C = 44 F. When started it runs for around 30 seconds and cuts out and once started again there's a smell of fuel. The choke isn't used during this start procedure and if it is, the engine won't start at all.

The engine when started doesn't run unless the throttle is held at around 2200 RPM until it warms up thouroughly. If the rev's are dropped during the warm up, the engine stalls.

I don't know what the idle speed is for a warmed up engine on the LX 125cc, I would imagine it should be around 1500 - 1800 RPM. The engine on this bike at the moment doesn't like running below 2200 RPM and even then seems to be seeking more revolutions to keep idling.

Any help on what's causing this is greatly appreciated.

[Vivo]

Idle jet may be clogged... this is the one that supplies fuel at idle... open carb and clean the jet..

[motoman]

Hi again Vivo,

I have tried mixing some Fuchs (Silkolene) PRO fuel system treatment in with the fuel, mixed at about a 2% ratio. I have only used a mix once with about 4 litres of fuel so far and this seems to have improved the problem a little. Which leads me to think that it may well be the idle jet as you have suggested.

I haven't got the time at the moment to dig deeper than this but I will let you know how things proceed.

Once again many thanks.

[Vivo]

You are welcome! What you did might work but you have to use the scoot more often for the jet to really get cleaned. Ride safe!