2007 Mercury Optimax 250 Pro XS Serial #: 1B492182
Question for Don or anyone who wants to take a shot.
Optimax powerhead failure piston Number two. All other pistons and bearings are fine.
New:
Water Pump
Fuel Pumps
Oil Pump
Air Injectors
Fuel Rail
Fuel injectors cleaned by European Marine
service items up to date.
Had a cracked front crankcase cover and replaced with a used compatible unit (2007 200 pro xs block front cover)
it developed a leak at the top crank bearing outer seal. I believe this introduced air in the system and possible burnt this piston. Lean mixture.
trying to get some feed back on possible cause. Below are attached pictures...
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