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Working on a 95 yamaha wave a raider 700 jet ski...does any body no the clearance between piston and cylinder wall on stock pistons

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The factors that affect this are cylinder wall thickness, whether the block is filled, the overall compression height of the piston, piston material and thickness, and whether a marine engine is to see fresh-water cooling. Most small blocks get .004 piston to wall clearance and most big blocks get .005 due to the use of our 2618 high-strength alloy. For heavy blower and nitrous applications, it is recommends adding .001 to the standard clearance. Special note: Clearance numbers are obtained from measuring the largest diameter of the piston, typically at the bottom of the skirt. All measurements should be taken 90 degrees from the pin centerline.

.004 piston, +/- 0.0005 to wall clearance is the answer, to your question.

Posted on Aug 03, 2010

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