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| techtalk:evo:engmech03 [2025/07/20 00:46] – [Cylinder Pressure Test] hippysmack | techtalk:evo:engmech03 [2025/10/01 04:21] (current) – hippysmack | ||
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| ===== Cylinder Pressure Test ===== | ===== Cylinder Pressure Test ===== | ||
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| It is important to make a check of your cylinder pressure (aka engine compression) as soon as you obtain your bike and, at least, on an annual basis thereafter. This is a great reference value to determine if the pistons, rings, cams, lifters, pushrods and valves are all functioning correctly together. Over time, these parts wear and your cylinder compression will reflect when these items should be checked, adjusted or replaced. | It is important to make a check of your cylinder pressure (aka engine compression) as soon as you obtain your bike and, at least, on an annual basis thereafter. This is a great reference value to determine if the pistons, rings, cams, lifters, pushrods and valves are all functioning correctly together. Over time, these parts wear and your cylinder compression will reflect when these items should be checked, adjusted or replaced. | ||
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| ===== Cylinder Leakdown Test ===== | ===== Cylinder Leakdown Test ===== | ||
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| If you find you have low compression in a cylinder, you will want to do a Leakdown Test. This test will help determine the location of the leaking air, such as worn exhaust valves, worn intake valves, leaky head gaskets, or worn rings. | If you find you have low compression in a cylinder, you will want to do a Leakdown Test. This test will help determine the location of the leaking air, such as worn exhaust valves, worn intake valves, leaky head gaskets, or worn rings. | ||
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| ==== Boring Cylinders ==== | ==== Boring Cylinders ==== | ||
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| Final cylinder bore sizes after honing. ((1986-1990 HD XLH FSM)) | Final cylinder bore sizes after honing. ((1986-1990 HD XLH FSM)) | ||
| ^Bore Sizes^883cc^1100cc^1200cc^ | ^Bore Sizes^883cc^1100cc^1200cc^ | ||
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| ====== Rocker Arms ====== | ====== Rocker Arms ====== | ||
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| - | ====== Pushrods ====== | ||
| ====== Gaskets ====== | ====== Gaskets ====== | ||
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| Gasket thicknesses are especially useful when setting squish clearance. ((Tomcatt of the XLFORUM)) \\ | Gasket thicknesses are especially useful when setting squish clearance. ((Tomcatt of the XLFORUM)) \\ | ||
| The squish band is the quench area. ((rocketmangb of the XLFORUM https:// | The squish band is the quench area. ((rocketmangb of the XLFORUM https:// | ||
