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The Maestro's Top 10 Reasons for a Backfire:
1. No tailpipes.
2. One tailpipe missing. Or one half a tailpipe missing
3. Leaking tailpipes
4. Hole in muffler
5. Leak at "J" tubes/muffler
6. Hole in J tubes
7. Blown exhaust gasket at head/J tube
8. Partially clogged idle jet (especially in Zeniths & Webers)
9. Carb dripping gas inside from various sources
10. Fouled plug
And three or four more for good measure:
11. Burnt exhaust valve
12. Sometimes a leaking head/cylinder, but it makes the most noise on acceleration.
13. Too tight intake valves
14. Broken Valve Spring/popped seat/intake valve seized/not sealing
15. Extractor exhaust
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“IN MY EXPERIENCE, SUSAN, WITHIN THEIR HEADS TOO MANY HUMANS SPEND A LOT OF TIME IN THE MIDDLE OF WARS THAT HAPPENED CENTURIES AGO.”
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