General Topics/Tech Tips Discussion on break in periods, rider comfort, seats and pad suggestions. Tech tips as they become available will be posted here.

2002 Harley Electra Glide

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Mar 9, 2019 | 06:56 AM

#11

Mattbastard

Grand HDF Member

Joined: Nov 2009

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From: Tampa

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Quote:

Originally Posted by Max Headflow

If you do this check make sure that you have compression on the rear cylinder and the rear plug in.

Genuinely curious here, but why? Is there some system in the ECM that would turn off ignition during cranking if there's no compression?

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Mar 9, 2019 | 08:11 AM

#12

Max Headflow

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Joined: Dec 2005

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From: poway

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Quote:

Originally Posted by Mattbastard

Genuinely curious here, but why? Is there some system in the ECM that would turn off ignition during cranking if there's no compression?

After 2000, (2001 efi for baggers) HD removed the cam position sensor. The only way to determine compression stroke was to measure the slowing of the crankshaft during cranking. Rear cylinder compression is most important as you don't want to fire the front cylinder on rear cylinder ignition timing.

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