"I'm a backyard mechanic l
"I'm a backyard mechanic looking for a used 2 or 4 stroke motor. Ran across an article stating that a cylinder leakdown test is much better than a compression test for revealing problems. All the examples were for 4 strokes. On this forum's archives I read where this test is meaningless for 2 strokes.
1. Can someone describe whether a cylinder leakdown test is valuable for a 2 stroke?
2. If yes, should the piston be at tdc or slightly before?
3. How do you interpret the results? I want avoid an engine that will definitely need major work in the near future. An article on 4 strokes said that a good reading is 5%, acceptable is 10% and 20% or more means repairs in the near future. I read on this forum's archives that on a 2 stroke, 35% means the engine is ready for rings. Don't understand why there would be a difference between 2 and 4 stroke motors.
3. Since I have gauges and a hose I would like to make my own leakdown tester. What is the correct restricter orifice diameter for a 2 gauge setup?
thanks"
"I'm a backyard mechanic looking for a used 2 or 4 stroke motor. Ran across an article stating that a cylinder leakdown test is much better than a compression test for revealing problems. All the examples were for 4 strokes. On this forum's archives I read where this test is meaningless for 2 strokes.
1. Can someone describe whether a cylinder leakdown test is valuable for a 2 stroke?
2. If yes, should the piston be at tdc or slightly before?
3. How do you interpret the results? I want avoid an engine that will definitely need major work in the near future. An article on 4 strokes said that a good reading is 5%, acceptable is 10% and 20% or more means repairs in the near future. I read on this forum's archives that on a 2 stroke, 35% means the engine is ready for rings. Don't understand why there would be a difference between 2 and 4 stroke motors.
3. Since I have gauges and a hose I would like to make my own leakdown tester. What is the correct restricter orifice diameter for a 2 gauge setup?
thanks"