namura piston bad? - ATV Enthusiast Community

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Old 05-07-2010, 10:58 PM
Thread Starter
Join Date: Jan 2010
Posts: 45
Default namura piston bad?

I have a 1999 trailblazer 250 and was recently rebuilding the motor. I put a namura piston in it and as i went to look in the intake port after finishing the motor i noticed where the bottom ring ended the small pin in the piston it was in the middle of the intake port and is slightingly catching the port. This is a brand new piston and i was just wondering if anyone alse has had this trouble with a namura piston. I have called them and they said it would be fine to run.
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Old 05-08-2010, 04:02 AM
Pro Rider
Join Date: Sep 2006
Location: Dawson Creek
Posts: 382

Well my thought is the oem piston must have done this too. As strange as that would be. Did they say it would be fine to run, or did they say it was designed that way. Two totally different scenarios.
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Old 05-27-2010, 08:58 PM
Weekend Warrior
Join Date: May 2010
Posts: 1
Default namura piston

am in the middle of a build on a 98 300 polaris and using the namura was wondering if anyone knows the amount of allowable crank up and down play
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Old 05-28-2010, 04:09 AM
Pro Rider
Join Date: Jun 2005
Posts: 2,343

Not sure of exact measurement but there should not be very much, better have rod bearing thouroughly checked, sounds like it may have problems.
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