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Sportster Motorcycle Drag Racing Discuss drag racing on a Sportster Motorcycle.

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  #1  
Old 1st November 2018
the cowboy way's Avatar
the cowboy way the cowboy way is offline
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Join Date: Apr 2006
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Sportster/Buell Model: hand built M/XL ironhead
Sportster/Buell Year: 9293
Sportster/Buell Model #2: 1976 motor in a 1987 fram
Sportster/Buell Year #2: ????
Other Motorcycle Model: 1974 XL & 2003 FXD
Other Motorcycle Year: 7403
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Default Building a dragbike 101

I got questions
How much travel do ya need on a air shift?
I'm building a 76 XL
The ignition wire don't fit its hole
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  #2  
Old 2nd November 2018
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Racepres Racepres is offline
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Quote:
Originally Posted by the cowboy way View Post
I got questions
How much travel do ya need on a air shift?
I'm building a 76 XL
The ignition wire don't fit its hole
Now you Know it needs enough to take up all of the travel... in both directions... with some left over.. Variable by the length of the Shifter "lever" attached..
If yer talkin which stroke cylinder to purchase??? I can Measure the Shortest that worked for us!!!
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Old 5th November 2018
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Sportster/Buell Model: hand built M/XL ironhead
Sportster/Buell Year: 9293
Sportster/Buell Model #2: 1976 motor in a 1987 fram
Sportster/Buell Year #2: ????
Other Motorcycle Model: 1974 XL & 2003 FXD
Other Motorcycle Year: 7403
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Thanks Marty
Measure it
I think I need 3 "
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Old 7th November 2018
the cowboy way's Avatar
the cowboy way the cowboy way is offline
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Join Date: Apr 2006
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Sportster/Buell Model: hand built M/XL ironhead
Sportster/Buell Year: 9293
Sportster/Buell Model #2: 1976 motor in a 1987 fram
Sportster/Buell Year #2: ????
Other Motorcycle Model: 1974 XL & 2003 FXD
Other Motorcycle Year: 7403
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Marty when you gonna get out the ruler ?

how much tranny oil ? running a dry primary
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Old 12th November 2018
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Quote:
Originally Posted by the cowboy way View Post
Marty when you gonna get out the ruler ?

how much tranny oil ? running a dry primary
Today.... I was kinda busy over the long weekend [for us] ya Know...
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  #6  
Old 13th November 2018
the cowboy way's Avatar
the cowboy way the cowboy way is offline
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Join Date: Apr 2006
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Sportster/Buell Model: hand built M/XL ironhead
Sportster/Buell Year: 9293
Sportster/Buell Model #2: 1976 motor in a 1987 fram
Sportster/Buell Year #2: ????
Other Motorcycle Model: 1974 XL & 2003 FXD
Other Motorcycle Year: 7403
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Awards Banquet
I knew that
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Old 13th November 2018
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Yep Banquet
now, Typical is a 1-1/2 bore by 3 inch stroke, the Cylinder..
We used a Smaller one... 1" Bore, by about a 2" stroke...
Paying particular attention to the shifting mechanism...
Remember, smaller displacement is Faster... larger displacement [bore anyway] is more powerful...I can Prove that set up properly, not much power is required...
Our 1" short stroke cylinder is capable down to about 60lbs pressure... reliably...
Remembering that untill full pressure is reached... no Kill Takes Place [slower shifts at higher Pressure]


Edit; Knowing Exactly how an air shifter works pays dividends... I used to hold "school" on this back in the day!!!
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