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I usually don't have these kind of problems but... My 18hp Vanguard seems to load up coasting down a hill and when you give it some throttle soon after, BANG! It is now tgo the point that it is driving me a little nuts. Valves are properly adjusted, carb is brand new, Everything else seems to check out okay. Does anyone else ever have this problem? or a possible fix?
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sounds a bit lean,probly from the cold -
Originally posted by jcjamieson View Post
My first thought was a carb problem. You said it was new, was it newly rebuilt or new out of the box? It sounds like a stuck float to me.Comment
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As soon as I put the whole thing back together tomorrow I guess i'll pull that limiter cap off of the new carb and give it a little more juice. I guess that could be why it falls flat on it's face when taking off from a stand still.
The carb is brand new out of the boxComment
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Condensation in gas? jets too small?Comment
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Had a similar problem and thought it was a carb or fuel problem. Turned out to be a bad spark plug. Isolated the problem by trying to start the engine with one plug wire removed. it would idle with the good plug getting spark and would not start with the bad plug connected.Acta non verbaComment
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Still Backfiring
I backed the airscrew out to the point that it does not fall flat on its face. But now it runs too rich. And still has the problem of loading up and backfiring. It seems to me like the clutch doesn't fully disengage when I let off the throttle. so it ends up spinning the motor while the butterfly is closed. it still sucks fuel and when I give it some juice it gets enough air and then it backfires.Comment
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