Why do Manufacturers tell you to change your piston and rings so often on a Motocross Bike or Dirt Bike?
Some people think as long as the bike kicks over and starts in a few kicks we are good, Not!
Below is a little bit of general information to look at. Always check your owners manual and follow their service recommended intervals.
Piston & Rings Maintenance:
Most modern two strokes / four stroke Motocross/Enduro motorcycles recommend piston and ring replacement at 15 hour or 5-6 race intervals. Just because the kick starter feels firm or it starts easy, it still may be time for maintenance.
Why do they suggest so often?
|50-125 CC 2-Stroke||15 Hours (Single Ring Piston)||7 Hour (Single Ring Piston)|
|175- 250 CC 2-Stroke (4-Stroke Piston||40 hours (Dual Ring Piston)||15 Hours (Dual Ring Pistons)|
|150F-250F cc 4-Stroke||40 Hours (Multi-Ring Piston)||15 Hours (Multi-ring Piston)|
|350F-450F cc 4-Stroke||60 hours (Multi-ring Piston)||20 Hours (Multi-Ring Piston)|
What will go wrong if you do not follow manufacturer's scheduled service intervals, to maintain your motor?
- Piston ring failure (score the cylinder)
- Damage the exhaust port area
- Damage power valves
- Damage cylinder plating
- Piston skirt can break and damage lower end of motor (crank Casse)
- Damage cylinder head