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Wet fowl

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  • Wet fowl

    Latest hair puller...We are all up and running now (the MX4) albeit with an extremely frustrating starting issue.
    A couple of kicks from cold will start. However after a brief run up and down the road it refuses to fire up again. Won't idle. Only way to restart is to remove the plug which is wet..dry it..and refit. Fuel mix is 20:1(good quality full synthetic)as its a fresh rebuild. Carb set up - as notes with 25 pilot, rather than 30. But have tried both.
    Anyone had a similar experience??
    Current thinking is possible float too high? But how high is too high? The bowl doesn't have a drain so setting up a rig to check fuel level would be difficult so thought I would try checking the float height instead (plastic float+viton needle which I had replaced). By my research top of float to top of bowl should ideally be 0.21" plus/minus 0.04. (4.5-6.5mm range).
    Would love to hear anyone else's diagnosis.
    Regards

  • #2
    Way too much oil if fully synthetic, even though "running in". Carb set-up/ fuel mix were written for non-synthetic oils.
    Last edited by johnrunnacles; 08/05/2024, 10:12 AM.

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    • #3
      Thanks John.
      Kind of thought so myself plug is oily wet if that makes any sense. Have read so many posts on mix ratios and am probably now even more confused . A Bultaco friend had steered me in the 20/25 :1 direction. I'll lean it out. What are your thoughts on 30:1?

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      • #4
        Another thought, is it specific "two-stroke" formula oil? Even if, still mightily high concentration at 20:1, I would think. Try 30:1 and make sure it's well mixed.
        Last edited by johnrunnacles; 08/05/2024, 11:42 AM.

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        • #5
          thanks again John appreciated..

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          • #6
            Might be spark plug, a racing plug will foul up if not being ridden hard, so try a softer plug

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            • #7
              John..nice thought, makes sense. Had replaced the old plug (Champion N60R)with a NGK B8ES what I had worked out was an equivalent. Might try a hotter 7 or 6 as I'm definitely not riding it hard at the moment.
              Thanks again appreciated.

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