Help! Honda XL125 suddenly stopped

[simon43]

I was riding my bike as normal, absolutely no problems. Then the engine backfired once and stopped.

The battery was strong and I tried the electric start quite a few times. The engine turned over but did not start.

I checked that there was sufficient fuel in the tank ==> all OK.

I took out the spark plug which was not oiled up. I attached the HT lead and pressed the starter button and got a strong spark.

The problem suggested (to me) a fuel blockage. I pushed the bike to a local work shop where they managed to start the engine once, but after pushing the kill switch, the engine then refused to start again!

They stripped down and cleaned the carb, reassembled everything and then tried to start the bike again, including pushing it at speed on the road (another bike rider alongside pushing with his foot). The bike still refused to start!

They and I are at a loss to think what could be the problem.

Any suggestions what to check next? Electrics seem OK, carb is clean, plenty of fuel in the tank.....

[Suntan Sid]

Is the fuel getting to the carb?
Is there a fuel filter fitted to fuel line?
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[cb1rocket]

spray easy start in air intake and see if it starts while spraying.
it will rule out electrics 100% if so
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[kgm]

Perhaps the kill switch is dodgy. Some engines will still turn over but not start with the switch off.

[bikenut]

You do not say what year the xl125 is, that may help.

Be methodical, you have fuel and its in the carb......yes some cheap easystart will rule out a lot of things, but dont use toooooo much, just a single one second squert into the carb.......

you have compression......

you have sparks, at the right time ?

does the engine "breath" ?

and yes. the kill switch.

All other electrics ok....?
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[techsnap]