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

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  #111  
Old 3 Weeks Ago
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Sportster/Buell Model: Sportster XLCH 900
Sportster/Buell Year: 1966
Sportster/Buell Model #2: Sportter XLCH 900
Sportster/Buell Year #2: 1967
Other Motorcycle Model: K-model
Other Motorcycle Year: 1955
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Ferrous Head
thank you for explanation, you mean new P cams for 57-69 sportsters ?
I would still be interested in the dyno curves ...
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  #112  
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Sportster/Buell Model: Sportster XLCH 900
Sportster/Buell Year: 1966
Sportster/Buell Model #2: Sportter XLCH 900
Sportster/Buell Year #2: 1967
Other Motorcycle Model: K-model
Other Motorcycle Year: 1955
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http://xlforum.net/forums/showthread.php?t=13776
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  #113  
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Quote:
However, the Y's are a bit softer down low, idle smooth as glass and pull nicely at higher revs. In hindsight, I'd have preferred the stock P cams for the basically stock motor.
Every thing you need to know right there.

Why new ones ?
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  #114  
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Sportster/Buell Model: Sportster XLCH 900
Sportster/Buell Year: 1966
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Sportster/Buell Year #2: 1967
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you write, HD actually had a pretty good set of cams with the P's.

https://www.youtube.com/watch?v=VmNwpXfBQoA

my bike with Y cams ...
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  #115  
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Im glad to see some activity back in this thread, as I have a couple questions.
Valve lash set set to .008" im assuming this means no lash, then the 1/4 turn of the adjuster nut? Also, is this change only done on ext tappets, or all 4? Did the last adjustment procedure actually change? I'm always exciting to try new things.
And the p intake with - - exhaust. Is that a good street combo? I currently have a set of og hustlers in my engine, and the bottom feels a bit soft. But it rips so f'n hard when it comes on.
So im wondering if I set the lash as described, and installed p intakes, if I'd have something a bit more fun.
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  #116  
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Sportster/Buell Model: Sportster XLCH 900
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me too, 1/4 turn under clock or clock wise ? = greater or lesser valve clearance?
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  #117  
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Unless you have modified rocker covers you can't measure the clearance.
Harley motors grow so much you can't run a hot small lash.
When the motor cools off it will have no compression.

So I set them "stone cold" and no slack (where you can still spin the push rod but feel drag)
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i remember chevelle using the t.p.i. of the pushrod adjusters to figure lash using the flats of the adjusters as increments.
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  #119  
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I set them the way I've always done it. I might try setting the exh the way chevelle mentioned. Im familiar with tpi adjustment, especially after changing cams in my 103.
Did change intake cams to p cams. I do feel more bottom end, just a quick ride around a few blocks. Didnt have to skip the clutch as much as I did with the siftons. I'll see how the butt dyno does when i can spend more time on it.
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