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502mpi please help quick question???

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Old 06-11-2012 | 04:54 PM
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Default 502mpi please help quick question???

When doing a compression test what should be the reading???? With normal wear and tear thanks guys. Oh and the motor in stock 1998 model. What should it be on each cylinder???

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Old 06-11-2012 | 09:47 PM
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150# with no more than a 15# variance between the highest and lowest cylinder. If its got a lot of hours, then maybe as low as 120#
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Old 06-12-2012 | 01:17 AM
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Put a charger on the batteries when doing the comp.test. If the batteries start to go down during the test, it will affect the numbers. Make sure it spins as good on the last hole as it did on the first hole.
The biggest thing you are looking for is equality, as Griff said. I like to see no more than 10 psi from highest to lowest.
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Old 06-12-2012 | 09:05 AM
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Ok thank you guys got it.
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