GX390 carb. huge difference. Fits perfectly and matches the intake and exhaust ports. Here's a comparison between stock and 390 carb:
i also jetted the main and pilot jets.
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i also purchased a 36 tooth axle sprocket to try out. im going to try out the live axle with either 6:1 or 4:1 ratio first to see how much of a drag these ebay bearings have but:
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