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

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  #1  
Old 17th July 2005
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Default Primary oil and capacity 1980 XLH Ironhead

Can anyone tell me what weight oil and how much I need to put into the primary case after I replace the clutches and steels. The book says to fill until its coming out of the fill hole and this should be 1.5 pints which is not enough to fill the case at all.
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Old 17th July 2005
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DON'T fill to fill hole. If you look down low under where the foot peg / shifter shaft is, you'll see a small (about 3/16ths) screw. hold bike upright & fill 'till it comes out this hole. If you've emptied the primary, then just put in 1 & 1/2 pints & you're good to go. If it's a pre '80's Sporty, use the same oil you put in the engine. If it's post '80, use sportrans (HD) oil...

Last edited by Fisherman; 17th July 2005 at 00:55..
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The oil that I was sold from the local mom and pop shop here Rolands motor works was 70W90 Full synthetic it totaly burned the clutch outand I did put it in according to the book I was just making sure I was reading it right thanks. When I change the clutch now in will put in same as engine oil. Its a 1980 sporty by the way. I should have read the book about primary case oil my bad so I guess I'm getting a new clutch.
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Old 17th July 2005
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I have used SportTrans in the primary on my 1980, and 20W50 in the engine. On my last oil change i used Mobil 1 15W50 in both. Works just fine, and i need keep only one product on hand for both.
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  #5  
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Did it burn out the clutch or just started slipping really badly. The synthetic is super slipery. That's why you don't use it for engine oil as it will cause bearing skate & ruin your bottom end. I've heard that the synthetic can be cleaned off the friction plates & the clutch salvaged if it's only slipping...
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The friction material was falling off the plates pieces of it were falling out as I was taking the plates out.
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  #7  
Old 17th July 2005
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Quote:
Originally Posted by Fisherman
Did it burn out the clutch or just started slipping really badly. The synthetic is super slipery. That's why you don't use it for engine oil as it will cause bearing skate & ruin your bottom end. I've heard that the synthetic can be cleaned off the friction plates & the clutch salvaged if it's only slipping...

OLD WIVES TALE...maybe you should let the MOTOR COMPANY know about this so they quit manufacturing synthetid fotr their bikes....I'd run 20W50 full synthetic in both places...been doing that since synthetic came out on my 73 Ironhead as well as my Dyna...the 70/90 is to freakin heavy for primary oil...use the 20W50 and your issues will be over....I use the 20W50 V-twin Synthetic that Mobile one sells at Walmart for $6.88 a quart...
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