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Old 11-09-2012, 10:36 PM   #1 (permalink)
IronButt
 
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Pinging or knocking after warm up

Everything was running fine until today on the way home from work. When cold the bike sounds fine but once it warms up there is a higher pitched pinging or knocking sound coming from the rear cylinder. I would think a bad rod bearing would make a noise up top all the time weather it was cold or not so I'm thinking possibly a push rod out of adjustment or a lifter not pumping up completely but still I am confused as to why heat would have anything to do with it.

Details:

80" EVO
Full top end rebuilt a couple months ago
Andrews EV27 Cam
K&N Cone Intake
Short Shot Exhaust
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Old 11-10-2012, 09:23 AM   #2 (permalink)
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Thermodyne is reading this now saying WTF is this? Thermodyne is reading this now saying WTF is this?
All the time, under load, at idle?

If it does it all the time after warming up, even at idle, then the lifter is the place to start.
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Old 11-10-2012, 11:02 AM   #3 (permalink)
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Quote:
Originally Posted by khutchinson View Post
Everything was running fine until today on the way home from work. When cold the bike sounds fine but once it warms up there is a higher pitched pinging or knocking sound coming from the rear cylinder. I would think a bad rod bearing would make a noise up top all the time weather it was cold or not so I'm thinking possibly a push rod out of adjustment or a lifter not pumping up completely but still I am confused as to why heat would have anything to do with it.

Details:

80" EVO
Full top end rebuilt a couple months ago
Andrews EV27 Cam
K&N Cone Intake
Short Shot Exhaust
Lifter not fully pumped up would be my first guess.





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Old 11-10-2012, 11:08 AM   #4 (permalink)
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All the time, yes. Checking lifter in a few. I'm hoping that's it. Cheap and easy.
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Old 11-10-2012, 11:48 AM   #5 (permalink)
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are u using adjustable push rods? if it sounds like someone is constantly tapping on the engine-appears to be a lifter, also when u did top end, did u re-use oem pistons? or are u using high compression pistons? still sounds like a lifter? considering it is sensitive to temp. and amount of time running, lifter problems can fluctuate, problems in other areas are produce more consistent sounds
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Old 11-12-2012, 11:16 AM   #6 (permalink)
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Originally Posted by cavemanmikee View Post
are u using adjustable push rods? if it sounds like someone is constantly tapping on the engine-appears to be a lifter, also when u did top end, did u re-use oem pistons? or are u using high compression pistons? still sounds like a lifter? considering it is sensitive to temp. and amount of time running, lifter problems can fluctuate, problems in other areas are produce more consistent sounds
Reused OEM pistons.

Got the cam cover off. Revealed that the snap ring came off of the oil pump shaft so it wasn't pumping oil. Nice. Replaced 2 of the lifters and put everything back together. Now I get a tapping sound all the time weather it's cold or not. Going to replace the other 2 lifters as well and see if that helps. Beyond that I have no clue what could be causing the problem.
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Old 10-03-2013, 09:06 PM   #7 (permalink)
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Fixed this a while back but wanted to update on the solution. It was, in fact, a lifter. I'm assuming that it was starved for oil and collapsed.


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Old 10-04-2013, 07:00 AM   #8 (permalink)
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Quote:
Originally Posted by khutchinson View Post
Fixed this a while back but wanted to update on the solution. It was, in fact, a lifter. I'm assuming that it was starved for oil and collapsed.


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Case closed Thanks for the update
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