Johnson Evinrude 18-35 Hp Cross Flow Piston Kit 100-103k OE 0392621, 0391056

Johnson Evinrude 18-35 Hp Cross Flow Piston Kit 100-103k OE 0392621, 0391056

Marsoni

M251S

$74.77

Get it in 3 business days with 1 day shipping. Friday, May 29

Johnson Evinrude 18-35 Hp Cross Flow Piston Kit 100-103k OE 0392621, 0391056WSM Outboard Johnson Evinrude 18 35 Hp Cross Flow Piston Kit (Kit includes Piston, Rings, Wrist Pin, & Clips) This part meets or exceeds OEM Specifications. Sizes Available: Part#: Std. 100 103k . 010 100 103 04k . 020 100 103 05k . 030 100 103 06k . 040 100 103 07k Please Make A Note On Invoice Or MESSAGE With Part # and Size. ITEM#: 100 103K PISTON KIT JOHNSON EVINRUDE 18 35 HP CROSS FLOW 81 05 STANDARD OEM#: 0391056, 0392621, 5006657 NOTE: 3. 000"

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MUCH better than the cheap plastic OEM part, Just a reminder though, these thread into an aluminum block so be very careful to start them finger tight first, then evenly tighten both bolts to push the fitting into the chamber. If you don't, it will slightly misalign and you run the risk of stripping the threads. The one comes with the replacement o ring, and be sure to get some antifreeze on that seal prior to attempting to push it into the chamber. IT IS A TIGHT FIT, but that's what you want, so just be careful. You might also want an extra hose clamp on hand, as the one that came with this began to bend as it got tight, so I had to replace it for peace of mind. Overall, great product though.

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Reviewed in the United States on January 9, 2026