DavidOfMA
Senior Member
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Getting back in gear after a long time away
Posts: 336
Beverly, MA
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I have a 2007 S40 which backfires. I've obtained some replacement pilot jets and read, here, the strategies for eliminating backfire. The first, adjusting the idle mix screw, was attempted by the previous owner, who stripped the idle mix screw head. I'm considering buying a used carb on eBay and tinkering with that instead of this already somewhat bunged-up carb. I haven't been able to find a 2007 but did find a 2000. Has the carb changed in the period from 2000 to 2007, or will I be able to modify the older carb, clean it up, and use it? If the answer is, "it's different," what model years will substitute for the 2007, assuming I can't find a 2007?
Also: Any tips on removing the stuck idle mix screw also appreciated, as plan B is to remove and replace it. I'm considering using a small chisel and tapping lightly to see if I can get some purchase on the stripped slot, or drilling a small hole in the screw and using an easy out, but these both seem to have the potential of damaging the threads.
Thanks, David
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