When should reed valves be replaced?
Reed valve petals wear down over time and should be checked every 15 to 20 engine work hours. If the reed valve petals are chipped, frayed, or no longer create an adequate seal, they should be replaced. There is no standard timeframe to use when changing your reed valve petals.
Should reed valves have a gap?
TECH TIP: How to Inspect 2 Stroke Reed Petals for Wear The petals should be seated against the cage with roughly . 015-inch air gap between the frontal edge of the petal and surface of the reed cage. The tolerance for air gap varies slightly by manufacturer, and also varies per each model.
Can reed valves cause low compression?
The intake system, including reeds, does not affect compression readings. Different gauges, engine warm/cold, other plug in/out, rate of turnover while measuring, number of strokes measured all affect readings.
How do you diagnose a bad reed valve?
Engines with reed valves that are failing can present symptoms of hesitation during acceleration. The engine may fail to respond to the increased fuel flow and then jump forward as the gas is finally ignited.
What does a 2 stroke reed valve do?
Two-stroke engines Reed valves are commonly used in high-performance versions of the two-stroke engine, where they control the fuel-air mixture admitted to the cylinder. As the piston rises in the cylinder a vacuum is created in the crankcase beneath the piston.
Can you flip reeds?
Yes, you can flip reeds. If that doesn’t fix the reeds not sealing, get new reeds. As for your compression, pull the head and check the bores.
What causes low compression in a 2 stroke engine?
What Causes Low Compression In A Two-Stroke? Reduced compression or difficulty starting can result from worn piston rings, which result from incomplete sealing. A worn piston ring or reed valve with too little seal may contribute to a lower startability rating.