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Discussion Starter #1
05 KFX 400 Ring Gap question,
I am freshening up my sons quad Cylinder and piston look good but I am putting on new OEM rings, the Ring gap of the factory rings were .014 top ring and the 2nd was .017 the new rings both measure .011 the manual lists only a service limit of .020. Should I change anything or run it with the .011 ring gap? I know wiseco recommends I think .004 per inch of bore as a rule of thumb ( I am running a Factory piston just listing what they suggest for their stuff). Thanks
 

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File them to factory, .014” and 0.17” for a stock bore. You can use a ring filing tool to keep the ends square (nifty little tool) or file by hand if you’re careful. I usually try to file toward the piston so the burred edge isn’t scratching at the cylinder wall.
 

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Discussion Starter #3
So .011 is too tight?
 

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Yes
 

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Discussion Starter #5
Do I file fit new ones or are the old ones still good then?
 

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I rarely put old rings back in, better to file the new ones to size and install them. The gap is to make sure they just touch each other when warmed up. If the gap is too small, they’ll close up before fully warmed up and have nowhere else to expand.
 
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