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Discussion Starter #1
The engine is bogging for short periods, a second or two, and not reaching full rpm together with uneven rpm, also backfires (bang) sometimes. When starting I need to heat the carbs if not the engine will die after 30sec.

Plugs are black with some brown dashes on them and electode tip are white. Standard petrol used.
Main pivot are standard and pivot screw are 1.5 out. (1.25 standard in manual)
Several years since it was on service.

Most of this started to slowly happen the last hour driving, though it still backfired randomly before.

Whats wrong, what to do?
 
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