Paul Hunt wrote:
> Backfiring through the carbs implies the valves open at the wrong time or
> more likely a cylinder firing at the wrong time. The latter can be caused
> by HT problems and sympathetic firing of a cylinder on intake with a
> cylinder on compression. Condition of cap, rotor and leads? Plugs? Have
> you looked at the HT system in the dark for any blue flashing? Do you still
> have the electronic ignition? If so it could be that, rather than splashing
> out on another electronic system it would be better to fit points and a
> condenser - cheaper and easier to diagnose. If you have points have you
> checked the dwell and timing? Is it correct and steady? Mixture is
> unlikely to cause back-firing through the carbs although it can cause
> mis-firing in the exhaust. Eliminate all ignition problems before looking
> at carbs.
Backfiring through the intake system is usually a lean mix or momentary
lean mix. Backfiring through the exhaust is usually a rich mix and/or
dropped ignition pulses.
Can be tested for by pulling on the choke to see if the intake
backfiring stops.
-Rock http://www.rocky-frisco.com
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