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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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bottom end, engine problem, springs, valves

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  #1  
Old 29th June 2009
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mandaltby mandaltby is offline
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I had a engine knock. Yesterday I adjusted tappets, and think I did it right. After about 30 miles the knock got louder, and sounded as though I put some steel ball bearings in my engine, or perhaps a hammer or a pry bar and some wrenches. A couple of guys that were riding old shovel;heads stopped by and checked it out as I was at the side of the road. One guy said that it sounded like I broke a valve or a spring. I towed bike home and shot this video so as to get advice from some more experienced people than me. On the video the sound quality is not the greatest, but it seems to me that the sound is coming form the cylinder, perhaps the top end. I wish that you could hear the rattle more. In person its louder, but the microphone on my camera is kind of crappy and is jsut picking up the sound of the bikes exhaust.
Any advice of people who might know what it is would be gratefully appreciated.
http://www.youtube.com/watch?v=w0qZc6AxHFE
I really hope that its the top not the bottom end.
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  #2  
Old 29th June 2009
auslad auslad is offline
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i take it you have enough oil??? oil pump ok??? is it pumping oil?? just a thought i hope its not too hardcore......cheers
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  #3  
Old 29th June 2009
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It dosn't cost anything to recheck your work. Adjust cold.
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  #4  
Old 29th June 2009
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My advice- quit starting it and take it apart before you make it worse.
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  #5  
Old 30th June 2009
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Quote:
Originally Posted by Jackster View Post
My advice- quit starting it and take it apart before you make it worse.
My thoughts exactly!!
It'll be cheaper to bust it open now, than to fix the damage caused later...
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  #6  
Old 29th June 2009
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beekay beekay is offline
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I agree with runningmouse. check those tappets!
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  #7  
Old 29th June 2009
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yeah, +1, readjust while cold. I doubt its in the bottom end, only because you adjusted the top end just before this started. Look back to what you changed... Might not have enough clearence, or may have too much...
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  #8  
Old 29th June 2009
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By all means, check the pushrod adjustment first. You may not have tightened one of the locknuts properly, and the tappet screw backed off. That would account for the sound starting during the ride. It sounds to me like a pushrod rattling around. And of course, the old adage holds true that whatever you did last is most likely the problem.

You might not have had the tappet at the lowest point when you adjusted the pushrods. That, too, would cause the them to be loose.
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  #9  
Old 29th June 2009
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+1 On the above Replies !!

Doublecheck what you done last !
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  #10  
Old 29th June 2009
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There is an old mechanics rule that says "if you have a problem, go back and check what you did last. More times than not you will find the problem".

I agree to check the adjustment.

Chris
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