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you can buy a rebuild kit for that pump but they are not easy to do and almost never work. just buy a new one. it's not worth chancing it as the same pump does oil too. your low speed idle problem sounds like carb adjustments or dirty low speed jets. the reason it starts right up is that there is a circuit in the cdi on those motors that advances the timing a little for you. once it reaches temp the timing goes back to normal. if your carbs are not set right then it will cough and stall.
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