Frequently Asked Questions
The information given in the technical support FAQ consists of very general knowledge in engine rebuilding. To retain the best outcome of your engine rebuild, please consult a reputable engine rebuilder to carry out your use of Namura products.
Q. What clearance do I use when installing a Namura piston?
A. All of our pistons are made to OEM specifications; this gives you the benefit on not needing to follow any special clearance specifications. All OEM clearances can be respected when using a Namura piston. Please note that the purpose of the machine can affect what clearance is used, you should always consult with a professional for your specific purpose. Also remember that aftermarket engine modifications can affect these important measurements. Namura is not responsible for any damage caused by such modifications.
Q. I have a 2 stroke, the piston has dual rings, which one goes on top?
A. The top compression ring will have a silver finish on the outer diameter.
Q. I have a 4 stroke, where do all these rings go?
A. Generally, the top compression ring will have a silver finish around the outer diameter; the middle ring will be all black followed by the bottom “oil” ring (which is made up of one expansion ring and two scraper rings). Please consult a professional if you are unsure.
Q. I have this 4 stroke, now I know where the rings go, so I just line up all these ring gaps... right?
A. The ring gaps should be staggered 120 degrees apart. Pay special attention to the oil ring; the two scraper rings should be staggered one inch from the gap of the expansion ring (one gap to the right of the expansion ring gap, the other to the left of the expansion ring gap). Please consult a professional if you are unsure.
Q. I see markings on the rings, does this mean anything?
A. The numbers or markings on the ring should be facing up when you install them.
Q. Does the coating on the piston affect my piston-to-cylinder clearance?
A. No, the coating is not a part of the thermal expanding material of the piston and will not affect the piston-to-cylinder wall clearance.
Q. It appears I have extra gaskets in my gasket set, why?
A. When we develop our gasket kits we sometimes include pieces that are only used in certain years of the application. Use the pieces that are needed for your specific application, always consult your service manual if in doubt.
Q. Can I buy product direct from Namura?
A. No, Namura products are dispensed to dealerships all around the world through our vast network of distributors. Please check out the Distributors page on our website to find someone in your neighborhood.
DISCLAIMER- THIS PAGE IS FOR INFORMATIONAL PURPOSE ONLY. NAMURA ACCEPTS NO LIABILITY FOR INFORMATION GIVEN. ALWAYS CONSULT A PROFESSIONAL.