No compression
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From: Colorado
^^ Why, in the Wide World of Sports, is the Folks at the Keyboard Always tearin **** Apart??? If nothing else, I get old stuff runnin Before I tear it Down, Just to run Water thru to "Clean" it Out.. Besides...If nothing more than a Numb Nuts adjusted Pushrods Wrong... Some Serious Waste of Time and Effort!!!!
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From: Colorado
If the OP has more info or history on the bike and engine in particular, they should provide it. And sure it's an old Sporty that we know eats valves and guides, but the picture of the plugs from another post didn't look bad in terns of burning oil, although I don't know if they were installed the week before the picture was taken. But if it were mine, I would spend time diagnosing the actual problem befire tearing it down. Including checking pushrod adjustment because that could affect compression. Although that may be what is eventually required.
Paul
Paul
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From: Colorado
yeah that would be wild! I dont think this one has that issue but good looking out!
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From: Colorado
Some Folks at the Keyboards like to think that the person who is posting a problem does his due diligence to try to resolve it. For me, I look up what was posted previously by them to better understand his issue. We're talking about a 1971 Ironhead here. A top end job on a 53 year old engine is not a bad suggestion. Sorry if you don't like my thoughts on his bike.
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From: Cental, MI
What was the compression reading then???
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From: Cental, MI
I'm going to Concur with Texas Scooter Trash Now...Heads gotta come off...But...Before ya do..did you do Compression test with and Without oiling cylinders?? Result?
also I assume you held Throttle Wide Open!!
One thing I would definitely do..before disassembly,, Loosen pushrods on that rear cylinder... test again..
But...even 90 is Lame for an Ironhead!!
Edit; If everything is done correctly...My Bet is a very Bad Valve...and of Course a Well Worn Engine complete..
also I assume you held Throttle Wide Open!!
One thing I would definitely do..before disassembly,, Loosen pushrods on that rear cylinder... test again..
But...even 90 is Lame for an Ironhead!!
Edit; If everything is done correctly...My Bet is a very Bad Valve...and of Course a Well Worn Engine complete..
Last edited by Racepres; Sep 23, 2024 at 09:07 PM.
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Joined: Aug 2024
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From: Colorado
I'm going to Concur with Texas Scooter Trash Now...Heads gotta come off...But...Before ya do..did you do Compression test with and Without oiling cylinders?? Result?
also I assume you held Throttle Wide Open!!
One thing I would definitely do..before disassembly,, Loosen pushrods on that rear cylinder... test again..
But...even 90 is Lame for an Ironhead!!
Edit; If everything is done correctly...My Bet is a very Bad Valve...and of Course a Well Worn Engine complete..
also I assume you held Throttle Wide Open!!
One thing I would definitely do..before disassembly,, Loosen pushrods on that rear cylinder... test again..
But...even 90 is Lame for an Ironhead!!
Edit; If everything is done correctly...My Bet is a very Bad Valve...and of Course a Well Worn Engine complete..
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From: Cental, MI
If you succeed...do you want a Couple More???? Seriously!
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From: Colorado
Definitely! This is the third old sporty Ive had theyve all had issues but never compression