It could very well be petcock. Do test of petcock as outlined above to verify it’s delivering adequate fuel-volume to carbs.
Also make note of whether vacuum is held by petcock. That is, once you apply vacuum, it flows petrol continuously, or if you have to keep applying more and more vacuum to keep flow going.
Last futzed with by DannoXYZ; October 15th, 2019 at 02:38 AM.
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