knock at idol
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3rd Gear
Joined: May 2011
Posts: 7
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From: vegas
knock at idol
I just picked up 97 fat boy with only 8000 miles been sitting a while but started regulary (so I was told). the motor sounds fine at high rpms but at idol it gets a pretty good knock on the top end and gets quieter and louder as I sit there. cams lifters and pushrods have been changed years ago. Any ideas I changed the oil to synthetic. no difference
Cruiser
Joined: Dec 2009
Posts: 159
Likes: 2
From: Southern Idaho
When I hear "started regularly" it makes me wonder, did they just let it sit and idle for a while, or did they actually go out and ride it. Sitting at idle for a while in my opinion is worse for the engine than just letting it sit, because of the condensation created in the engine without it getting hot enough to burn it off. Condensation can get on bearing surfaces and cause pitting. I hope you find the noise without it being too big of an issue.
Road Captain
Joined: Mar 2008
Posts: 601
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From: Aruba
Or, maybe you need louder pipes.
Club Member
Joined: May 2007
Posts: 145,895
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From: 40 miles Northeast of Indy..
Syn oil is actually thinner than its equal weight dino oil, so U will have a little more lifter noise with it at idle.
list to other Evos and see If Urs is louder than them, Harleys are not quiet to begin with and sometimes a noise get louder if we try to hear them just because we are listening.
list to other Evos and see If Urs is louder than them, Harleys are not quiet to begin with and sometimes a noise get louder if we try to hear them just because we are listening.
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3rd Gear
Joined: May 2011
Posts: 7
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From: vegas
It was noisey before the oil change.thats why i tried that first. This is my fourth harley and the knock is definetly louder than any of the other bikes ive had. I can try uping the idol see what that does. andrews pushrods, jims lifters tappet assy, ev27 camshafts andrews. what about carbon on cylinder heads? Anyone try the water trick in the intake
Account Closed
Joined: Oct 2009
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From: In the World
I got nothing ... but that little creepy kid Justin Bieber came to mind when I read "knock at idol."
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Club Member
Joined: May 2007
Posts: 145,895
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From: 40 miles Northeast of Indy..
sorry I just dont' know bout Evos.. they idle so low compared to our twinky..
thinking a lifter, pushrod or most other head issue would do it all the time.
let us know when u figure it out.
thinking a lifter, pushrod or most other head issue would do it all the time.
let us know when u figure it out.
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Cruiser
Joined: Jun 2010
Posts: 136
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From: Oak Harbor
You might be onto something. Could also try adding some Seafoam to the gas and ride it like you stole it. It's a pretty good decarbonizer.
Tourer
Joined: Jun 2008
Posts: 306
Likes: 7
From: Somewhere, PA
If the Andrews pushrods are adjustables, you might want to do a quick readjustment on them. Easily done, and it will rule out the knock coming from a loose pushrod (although that usually sounds like more of a 'ticking' than a knock.) Don't rule out bad gas, especially if you're not running 93 octane. Timing too advanced will also cause a knock if you've changed anything there (and you might want to verify timing just in case). If you have a mechanics stethascope, or even a long screwdriver, piece of a broomstick, etc, you can put one side to your ear and the other to various areas of the motor to try and pinpoint where the noise is coming from.
Short of that, and especially if the issue worsens, you might have to pull the heads to see what's going on in there...
Short of that, and especially if the issue worsens, you might have to pull the heads to see what's going on in there...