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Discussion Starter #1
Hey guys does anyone have an idea why my 74 Yamaha SL 338 F would be backfiring as if it is lean? I cant get it to idle for more than 3 sec. but if I ride it its ok and runs normal for about 10-15 min. then it starts to bog and backfire pretty bad. I cleaned the carb completely, have good spark, and the fuel lines are all clear. Any ideas what to check next? It ran good a few weeks ago then all of a sudden this. Thanks
 
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