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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Impending bearing failure?
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<blockquote data-quote="davidd" data-source="post: 36067" data-attributes="member: 1177"><p>H.,</p><p></p><p>A leak down test requires a gauge like a compression tester, but it has a small regulator and an additional gauge to show how much air is leaking out of your engine. I warm up the engine, I usually do the test after the last race of the weekend, then I take out the pushrods through the rocker adjuster holes. You then hook the gauge up to an air source like a compressor and adjust the regulator to say 100 lbs. Hook up the gauge to the spark plug hole and with the pushrods out the engine will move on its own to bottom dead center, but both valves will be closed. Then look at the "percentage gauge" which tells you how much your cylinder is leaking. On a new rebuild it is usually 5% and when the after running it will drop to 1or 2%. When I broke a top ring it registered 60% and the air was rushing out the breather. If the head seal is leaking it will be rushing out there. If the intake is leaking it will be rushing out the carb and if the exhaust is leaking you can hear it in the pipe.</p><p></p><p>It is a very quick way to check the state of tune of the top end without disassembly. A fellow motorcyclist or auto enthusiast may have one or it can be purchased for about $50 (here in the states.)</p><p></p><p>Good luck</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 36067, member: 1177"] H., A leak down test requires a gauge like a compression tester, but it has a small regulator and an additional gauge to show how much air is leaking out of your engine. I warm up the engine, I usually do the test after the last race of the weekend, then I take out the pushrods through the rocker adjuster holes. You then hook the gauge up to an air source like a compressor and adjust the regulator to say 100 lbs. Hook up the gauge to the spark plug hole and with the pushrods out the engine will move on its own to bottom dead center, but both valves will be closed. Then look at the "percentage gauge" which tells you how much your cylinder is leaking. On a new rebuild it is usually 5% and when the after running it will drop to 1or 2%. When I broke a top ring it registered 60% and the air was rushing out the breather. If the head seal is leaking it will be rushing out there. If the intake is leaking it will be rushing out the carb and if the exhaust is leaking you can hear it in the pipe. It is a very quick way to check the state of tune of the top end without disassembly. A fellow motorcyclist or auto enthusiast may have one or it can be purchased for about $50 (here in the states.) Good luck David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Impending bearing failure?
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