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Old 09-04-2021, 08:09 AM
  #13  
1QwkSport2.5r
 
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If your rpm hangs when you come off a high rpm run, your high speed is too lean most likely. Most people would richen the low speed, but this wouldn’t be correct if the idle speed is stable and the transition is nice. An over advanced ignition will over heat the plug and a further lean low mixture will keep it hot. Richening the low side will just quench the plug and band-aid the problem.