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Yamaha OEM inline 4-cylinder engine cylinder block/jug barrel assembly with integrated cast iron sleeves inside a lightweight aluminum housing. This part supports the reciprocating pistons and helps manage heat in the engine top-end area. It includes air-cooling fins, upper stud mounting points, a central timing chain guide channel leading to the lower crankcase, and a top-face mounting boss for the original chain tensioner push-rod plunger setup. Compatible Models Yamaha XJ550 Maxim 1981, 1982, 1983 Yamaha XJ550 Seca 1981, 1982, 1983, 1984 Casting mark: 4U801 Designed for the 528cc air-cooled Yamaha XJ550 platform with the standard 57.0 mm bore. Similar later 600cc layouts may look close, but this casting is made for the XJ550 bore design without machining changes.
Please verify compatibility with your specific motorcycle model before purchasing.
Cleaning Status
partially_cleaned
Cleaning Notes
Used anti rust
Worldwide shipping available
Express shipping available at checkout
Estimated delivery: 2-5 business days
All items are carefully packaged for safe transit
Items can be insured — contact us for more information
30-day return policy on most items
Items must be in original condition and packaging
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Yes, all parts with OEM numbers are genuine manufacturer parts. Check the specifications tab for the OEM number.
We offer a 30-day return policy. Items must be in original condition. See the Shipping tab for complete details.
Yes, we ship to most countries worldwide. Shipping costs and delivery times vary by location.
Parts are sold separately. We recommend professional installation for safety and warranty purposes.
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