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Weird Problems

smccloud

CB750 Member
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After sitting for four years I got my dad’s old ‘79 CB750K running again. The problem is, it will not review past 6000RPM. If I give it more than half throttle, it falls flat on its face and it also pops and backfires when I let off the throttle. The carbs were rebuilt (by my dad), but it is possible something got messed up. I did just change out the coils because there were known bad. I am planning on plug wires and wire ends, but I don’t think that will help based on what happens if I give it more than half throttle.
 
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