Thread: spark plugs
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Old 15-Apr-2004, 15:19
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Derek Derek is offline
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Bikes: ST4s ABS
 
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In addition to Shazaams comments I'd consider replacing the emulsion tubes (needle jets). If they've never been changed at 40K they will be shot by now. Over a period of time the needles wear a groove in the jets turning them oval. Symptoms are a rich mixture and lumpy low speed running. I changed mine at 21K and it transformed the bike's behaviour at low speeds and around town, also picking up much more cleanly.
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