Later Evo compression problem

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Apr 20, 2013 | 12:15 AM

Fear2722

Thread Starter

2nd Gear

Joined: Oct 2012

Posts: 6

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From: Oneida, IL

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.

Thanks.

Apr 20, 2013 | 08:42 AM

Dan89FLSTC

Seasoned HDF Member

Joined: May 2008

Posts: 21,032

Likes: 12,559

From: South Carolina

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; Apr 20, 2013 at 08:50 AM.