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This is in reference to 1951 FL, rebuilt(again) and tuned recently.
Yesterday I was riding all morning, and the engine sounded as strong as it ever has. Yes, it is crazy hot outside, but it was running great. After lunch time, I was riding through the city, then it started popping and backfiring, and wouldn't stop, doing it worse at higher RPM. So there's the story of when it happened, here's symptoms & diagnosis.
Spent about 5hrs tearing it down from here to figure why it was backfiring out of the carb AND the exhaust. Seemed like a timing thing, but here we go
- checked plugs, they looked good
- checked all intake leaks, all tight from manifold and around carb
- checked all push rods, and dialed
- checked carb, even replaced with new Super E, same issue
- checked timing, dialed
- checked condenser, as this sounded just like it, replaced with brand new condenser, same issue
- checked and replaced entire auto advance with new one, same issue
- Tested battery, which has recently been changed to an 8-cell Antigravity battery, yes overkill in battery size, other conventional one went out and I had this lying around, tested good.
So there's got to be something I'm missing, anyone?!?!?
Yesterday I was riding all morning, and the engine sounded as strong as it ever has. Yes, it is crazy hot outside, but it was running great. After lunch time, I was riding through the city, then it started popping and backfiring, and wouldn't stop, doing it worse at higher RPM. So there's the story of when it happened, here's symptoms & diagnosis.
Spent about 5hrs tearing it down from here to figure why it was backfiring out of the carb AND the exhaust. Seemed like a timing thing, but here we go
- checked plugs, they looked good
- checked all intake leaks, all tight from manifold and around carb
- checked all push rods, and dialed
- checked carb, even replaced with new Super E, same issue
- checked timing, dialed
- checked condenser, as this sounded just like it, replaced with brand new condenser, same issue
- checked and replaced entire auto advance with new one, same issue
- Tested battery, which has recently been changed to an 8-cell Antigravity battery, yes overkill in battery size, other conventional one went out and I had this lying around, tested good.
So there's got to be something I'm missing, anyone?!?!?
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