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Join Date: Jul 2006
Location: Kennett Square, PA
After you check the vent hose (which seems to be a really common problem), and the areas Hyper mentioned, you might also check two things on the right side: first, make sure the exhaust is really on tight. If there's a leak, you'll get popping. Check the acorn nuts up at the exhaust header pipe, and also check to make sure the bands are tight where the pipes go into the premuffler chamber (the big chamber that sits right under the battery box). The second thing would be the air/fuel adjustment screw on the right side - if it's running lean, you'll get some popping. Turning the screw out (lefty loosey) may help - most folks are bottoming out the screws, then backing them out 2 1/2 or so turns. Beyond three, you run the risk of the screw falling out - so back it out slowly (and dont' lose count!).
That said, do the vent hose, filter, and visual checks first; then move on to the fasteners.