Reply to "UPDATED - Backfire under Low RPM / Load (4th or 5th Gear)....."

panteradougMember

Those plugs to me show a carburation issue. It could be as simple as just needing to index the spark plugs but it looks more than that.

The black on the plugs is what I would expect to see from a leaking power valve. What is keeping the engine running is that there is a very hot ignition system in there that is causing the white tips.

There is somewhat of a misbalance here between the plug temps, the fuel mixture and the spark heat.

Those plugs should be rust brown with a transparency with no white carbon build up on the plugs.

In short, they are a mess and there is a bunch of work to be done.

4/13/165:17 AM

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