Later Evo compression problem - Harley Davidson Forums

Engine Mechanical Topics Discussion for motor builds, cams, head work, stripped bolts and other engine related issues. The good and the bad. If it goes round and around or up and down, post it here.

Later Evo compression problem

Thread Tools Search this Thread
Old 04-20-2013, 12:15 AM
Fear2722 Fear2722 is offline
New Member
Thread Starter
Join Date: Oct 2012
Location: Oneida, IL
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Default Later Evo compression problem

Hey All -

I have a later style Evo motor, rear cylinder has ZERO compression. Front has 100+ PSI. The cylinders were bored/honed and matched to new pistons before I bought it.

Anyway, upon my investigation, the rear cylinder has a GREEN pushrod for the exhaust, and a YELLOW one for intake. The book says it is supposed to be PURPLE for rear, and BLUE for intake, and the Green/yellow should be up front.

Not to get the cart too far ahead of the horse, because I haven't popped open the front cover yet... But if these pushrods are installed ***-backwards like I believe, would this give me the zero compression reading?

I'm guessing the guy I bought this from, who built it for me, just had parts laying around enough to call it an engine.

Reply With Quote
Old 04-20-2013, 08:42 AM
Dan89FLSTC's Avatar
Dan89FLSTC Dan89FLSTC is offline
Ultimate HDF Member
Join Date: May 2008
Location: Connecticut
Posts: 6,089
Thanked 169 Times in 144 Posts

If the pushrod is longer than it should be it could prevent the valve from closing fully, you must get them installed in the proper positions.

There is nothing wrong with one piece pushrods, as long as they are used with a compatible cam and are installed in the proper position.

Last edited by Dan89FLSTC; 04-20-2013 at 08:50 AM.
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Rear cylinder not firing Corey Bergeron Sportster Models 2 08-31-2014 08:57 AM
EVO Ignition Help Ultrahog07 Evo Classic Models 11 07-31-2014 01:06 PM
Sudden loss of compression mayneman Shovelhead 21 07-29-2013 08:35 PM
Evo Compression test okidiver2001 Evo Classic Models 7 06-04-2012 09:26 PM
Adjustable Pushrod Settings? Z Dyna Glide Models 3 08-02-2006 01:07 AM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -5. The time now is 06:49 AM.

  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: