Filter Micron questions - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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post #1 of 8 (permalink) Old 06-19-2019, 05:49 PM Thread Starter
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Filter Micron questions

New rider here and I just purchased my first bike and the oil hasn't been changed in over 3 years or 6000 miles. I have a 2000 HD FXDX (Dyna Super Glide Sport) that has been stroked to 103 cu in, when stock was 88 cu in. I know it uses Amsoil in the primary and engine with redline in the tranny but have no idea about what filter to use. I bought the Amsoil EaOM134 which is rated at 20 microns @ 98.7% efficiency but the manual asks for a HD 10 micron filter part number is 63731-99 which seems to be discontinued. So my question is should I get Harleys 5 micron filter or stay with the Amsoil 20 micron one? Would the HD 5 micron be to restrictive of flow for the bigger engine? Ive tried to look but cant find the efficiency rating for Harleys 5 micron filter either. Thank you all for your time!
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post #2 of 8 (permalink) Old 06-22-2019, 06:31 AM
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Forget about the claims of micron, it is a bunch of mumbo jumbo BS, just buy the correct filter designed for the engine.

HD: 63731-99A

WIX: 57148

K&N: 171B
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post #3 of 8 (permalink) Old 06-22-2019, 07:28 AM
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Use the 63731-99A filter. It was made for that motor.

Just cause your was bored and stroked don't mean the oil filter needs to be re-engineered, the MoCo released stock motors in 103 CI since 2000 which use that filter..... No need to reinvent the wheel....

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post #4 of 8 (permalink) Old 06-22-2019, 07:35 AM
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They had to stroke an 88 to get it to 103? I thought that was just a bore?

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post #5 of 8 (permalink) Old 06-22-2019, 07:48 AM
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88 to 96, stroked. 96 to 103, bored. So 88 to 103, bored and stroked ! Right ?
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post #6 of 8 (permalink) Old 06-22-2019, 07:50 AM
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They had to stroke an 88 to get it to 103? I thought that was just a bore?

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Nope.


Just the big bore on the 88's crank yielded 95CI.


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Originally Posted by Kainam View Post
Here's the MoCo offerings:

Displacement = Bore x Stroke

88 = 3.750 x 4.000

95 = 3.875 x 4.000

96 = 3.750 x 4.375

103 = 3.875 x 4.375

110 = 4.000 x 4.375

113 = 4.060 x 4.375
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post #7 of 8 (permalink) Old 06-22-2019, 07:54 AM
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So piston speed stays the same either way.

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post #8 of 8 (permalink) Old 06-22-2019, 07:59 AM
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So piston speed stays the same either way.

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For a particular crank used, yes.
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