READ THIS BEFORE PURCHASING :BUYER TIPS ON PURCHASING THE CORRECT PISTON SIZE.
To determine which piston size you require there is a very important first step. Always measure your cylinder bore size first. This is only size that matters! Two-Stroke pistons are listed by size to FIT the cylinder bore size. Measuring pistons to determine what to purchase will most likely cause you to purchase an incorrect piston to fit the cylinder bore.
Two-Stroke pistons are manufactured with a cam shape. They are never straight and round. Measure a 2-stroke piston at the bottom of the piston skirt, ninety degrees from the wrist pin hole. This measurement only is used determine piston to bore clearance. Do not try to match a size from a used piston. This will always produce a faulty measurement. Used pistons wear out and change shape.
Buyer Tip: Before purchasing, remove your cylinder to be inspected and measure for bore size. If boring is required for your cylinder, purchase a piston at least two sizes larger than the measured size to allow clean-up and honing to the new piston size.
This is a new PRO-X Piston Kit. 1st Oversize +.010" ( 68.25mm ) New piston kit, old stock.
Fits: YAMAHA YZ-250 1983-87, 2-Stroke.
Here is a list of all of the piston sizes available to purchase on my store:
- 1st oversize bore +.010" 68.25mm
- 3rd oversize bore +.030" 68.75mm
- 5th oversize bore +.050" 69.25mm
- 6th oversize bore +.060" 69.50mm
- 7th oversize bore +.070" 69.75mm
- 8th oversize bore +.080" 70.00mm
A qualified machine shop is required to measure your cylinder, then bore the cylinder to fit the piston.
Check your bore size before purchasing. Year and Model are important, check yours before purchasing. Re-stock fee applies to returns for refund. No re-stock fees for exchanges.
The kit is supplied with piston, double ring and clips and pin.
Keep your vintage YZ-250 running with this piston kit.
You will receive 1 each piston kit when you order.
Note : Picture is not exact model, you will receive correct kit when ordering.