The sputtering and backfiring through the intake doesn't sound valve related to me on a two banger. Could very well be ignition. Maybe bad plugs or points. Seems like when the condenser shorts out it cuts out for a few revs and then fires, igniting gas fumes in the muffler making a loud backfire, but usually a condenser doesn't cause popping up through the intake.
The oval muffler on my 630 looks pregnant from a couple of episodes of shorting condenser. Jim
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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