Est. delivery Sat, Oct 18 - Wed, Oct 22Estimated delivery Sat, Oct 18 - Wed, Oct 22
Returns:
30 days returns. Seller pays for return shipping.
Condition:
NewNew
Wiseco Piston Kits. Manufacturer: Wiseco. Model: Piston Kits. They may opt to repair or replace the item at their discretion. If a size chart is provided, it is for reference only and we are not responsible for errors or accuracy of the chart.
Got this one in an 89 CR500, first over at .0025 wall clearance. Maybe a little tight
but I broke it in right and now super quiet and running perfect. Key to long life, esp
in a big bore 2stroke is slow warm-up. Resist the temptation to get revvy with the
throttle when cold. The piston expands faster that the water cooled cylinder then
binds or cold seizes in the tight bore. I found tiny cracks on the intake side of the
piston skirt on the stock piston from the original owner. Caught it before it came
apart and lunched the whole motor. I've run thousands of laps on moto courses
for years and have never blown a motor. I get holeshots too. Jet a little fat and
always warm'em up well before buzzing the motor. With an exhaust bridge, drill
the holes on the exhaust side also for extra cooling, I run 927 oil at 32:1 and
a dash of 110 fuel mixed with regular gas to just prevent pinging. Keep fresh
reeds and repack your silencer often with R19 pink insulation for quik response. .k