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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 4th October 2012
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Default My Lucasoil experience

My 69 CH, Animal Mother, went from a 1-2 kick wonder to a 2 dozen kick temperamental monster, after I added some of that Lucasoil to her lunchbox. Of course, I am mostly to blame--- it was the end of summer, the 100 degree temps were mostly over and, mixing the Lukeoil--- already thick as glue--- with SAE 70 was probably a bit too much. There were still occasional temps in the 90s, but overall it'd cooled down dramatically here in Arkansas, and I must've adjusted tappets three or four times trying to deal with her sudden hard starts. Hot, she was good to go--- reliable one-kick. Cold, she wouldn't wake up.

The only real variable was the Lukeoil, so I reluctantly drained the lunchbox, replaced with Penzoil 20w-50 (it has REALLY cooled off--- highs in the low 70s), and she's back to her old compliant self. Kicking a mag Sporty, you need every edge you can get, and lighter oil can be the difference between tooling down the road OR sitting hot, sweaty & exhausted, sucking a beer, admiring your CH, while dreaming of one day kickstarting her again. I saved the SAE 70/Lukeoil mix in a milkjug and will use it next summer.....
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Old 4th October 2012
John Harper John Harper is offline
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That's very interesting, just changing viscosity and she starts.

John
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Old 4th October 2012
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I've been running monograde 50 on my '69 CH. If I was planning an extended highway run in higher temps, I'd go thicker as needed, but for most of my riding the 50 works well. Just on these September and October nights where it cools into the low 40s, it makes a very big difference in the starting. 1-2 kicks in July, 10 plus the other day. Not going to switch over to 20/50 for winter, since it won't be ridden that much. Just not my weapon of choice for winter riding, but I do ride all winter. Currently, my '72 Commando has 50 in it, and I'll switch it over to 20/50 for winter. It's gone from a 1-2 kick starter to 3-5, but I can just tell from the feel of things, the kickstart isn't spinning the engine fast enough to commence things. Part of the charm on these old things.
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Old 4th October 2012
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Default

Quote:
Originally Posted by John Harper View Post
That's very interesting, just changing viscosity and she starts.

John
definitely makes a difference if you start your bike with your leg instead of a button. you can feel the thick oil slowing down your kick stroke when it's cool out. i'll be changing to 50wt soon.
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Old 4th October 2012
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I run straight 60 all year with no problems
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Old 4th October 2012
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And makes even more of a difference with a magneto!
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Old 4th October 2012
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I'll be going to thinner oil soon, typically in the 30s soon, 60 wt is probably like pumping butter at those temps. hahahaha
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Old 4th October 2012
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Worse, Molasses. You know, when you start talking about some parts being splash oiled, I don't think overly thick oil helps a lot.

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Old 5th October 2012
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Have any of you noticed a difference in valve train noise when switching oil viscosity?


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Old 5th October 2012
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Myself I just like thick oil in a piglet.May have pulled the heater by motor afew times but mostly just kick her thru afew times and she was ready to be kicked for starting and I also may drop some STP in there.Back in the day we called this motor honey.If you ever tear down and want to coat your parts with something that will cling to the part and not run off try you some STP.
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