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2 stroke running without spark.....

  • 30-04-2007 11:37am
    #1
    Fr Dougal
    Registered Users, Registered Users 2 Posts: 412 ✭✭


    A strange thing happened yesterday......
    Mini moto scrambler in the back garden and the chain slipped off the sprocket. Without the chain, the engine started to run very high. Pressed the kill button on the handlebar to short out the spark but it didn't cut off. I turned off the petrol but engine kept running on the petrol in the carb. Grabbed a pliers and pulled the ht lead off the top of the spark plug but the bike kept running, very high. After about 30 seconds the fuel in the carb ran out and it stopped.
    Never heard of this happening before. I assume somehow, due to the high temperature in the cylinder the petrol combusted automatically when it entered the chamber. Anyone ever come across this before?


Comments

  • #2
    galwaytt
    Registered Users, Registered Users 2 Posts: 12,822 ✭✭✭✭galwaytt


    Yes, I've heard of similar, but not for many years............old LC's could actually start in REVERSE. You'd get quite a shock if you put it into gear, let out the clutch.........and shot backwards :eek: :eek:

    Was it running for long, idle (i.e. overheating)..........is it air cooled?

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  • #3
    Fr Dougal
    Registered Users, Registered Users 2 Posts: 412 ✭✭Fr Dougal


    galwaytt wrote:
    Yes, I've heard of similar, but not for many years............old LC's could actually start in REVERSE. You'd get quite a shock if you put it into gear, let out the clutch.........and shot backwards :eek: :eek:
    Ouch
    galwaytt wrote:
    Was it running for long, idle (i.e. overheating)..........is it air cooled?
    Altogether it was running high for close to a minute until the petrol in the carb ran out, 30 seconds before I pulled the lead off the plug and then another 30 seconds until the carb emptied.
    I was worried about it overheating. It's air cooled. It cooled down while I put the chain back on and adjusted the tension. It ran fine after that.


  • #4
    madrab
    Registered Users, Registered Users 2 Posts: 3,892 ✭✭✭madrab


    yeah that can happen, usually from a hot piece of carbon buildup on the piston causing pre-ignition


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