1. Carefully inspect rubber boots between head and carbs. Did any of 4-junctions get pulled apart causing vacuum leak?
If there was rust, it may have found its way downstream.
2. Test petcock flow-rate. Unplug fuel hose from carbs and aim into measuring cup. Turn petcock to prime for 30-sec. How much petrol did you collect in measuring cup?
3. Test float levels without removing carbs! Slip hose over float-bowl drain nipples and aim into empty measuring cup. Drain both float bowls. How much petrol did you collect in measuring cup?
4. Pull plugs and post photos of them. Wondering if speed-loss is due to lean or rich mixtures?
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