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Does anyone know if the piston is suppose to have a coating? When i took my piston out I cleaned it up with a glass bead blaster. I passed it over the whole thing lightly to get it clean. My guy putting the engine together said I shouldn't have done that as some pistons have a coating. It is within spec otherwise. Should I order a new one or do you think this one is fine. He seems to think it will be ok but he is leaving it up to me.
 

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It's just a plain old everyday cast Jap piston. Nothing special about it.
 

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Just my $0.02





The crown/head may build carbon faster because it isn't smooth.





If the ring grooves aren't thoroughly protected during blasting, the top and bottom of the rings will not seal where they contact the grooves, resulting in lost power and increased oil consumption.





Any blasting media can be very difficult to clean out of all the oil drain-back holes, piston pin retainer grooves, ring grooves, etc, and will act as an abrasive when mixed with oil in a running engine.





Here's a link to some car guys talking about cleaning pistons http://www.roddingro...opic.php?p=9850 & http://www.redpowerm...showtopic=60249 Some do it and some don't



A new Yamaha OEM piston is only $43.00 & an oversized one is $47.00
 

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Yeah, it's up to your own discretion about how much 'blasting' you did to it. I try to avoid getting too overzealous in my piston cleaning for the reasons mentioned above.



But if the piston isn't nikisil coated, you might as well try running it if you know what you're doing and can tear the engine down later when you get a new one. It shouldn't eat up the jug. But if you're the type that likes to do things right the first time, a new one probably isn't a bad idea.
 
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