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

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  #1081  
Old 1 Week Ago
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cycowrencher cycowrencher is offline
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The 30 tooth Evo Ind aluminium crank sprocket changes the primary ratio from 1.6:1 (35/56) to 1.86:1 (30/56). I also have a 57 tooth clutch basket to get 1.90:1... Close enough to 2.0...

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  #1082  
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Two step parts in route! Kind of excited to hold the throttle wfo at launch!
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  #1083  
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Sweet. That kicks us out of the street class if we install one.

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  #1084  
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Anyone got a PBI 281-22 front...

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  #1085  
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Here's my build for the winter. My dad's brother bike he won in 1953. This will take time.

I have to make this

IMG_1007 by brianbbs67, on Flickr

Into this

13503121_1764998320438514_1653854747907469511_o by brianbbs67, on Flickr
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  #1086  
Old 5 Days Ago
mac93 mac93 is offline
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Cool build, Looking forward to updates.
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  #1087  
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Here is the how to on cleaning up the shift drum and arms.

Here is the damage that the sharp edges cause in the arms.


Here is the untouched drum. Notice the hard edge on the channel.



Here is the arm after a quick clean up of the leading edge of the drum hole. You want to do this all the way around on both sides of all 3 arms.



Here is the angle you want to relieve the edge at.



Here is the angle you want to relieve all of the arm pathway on the drum at. You need to use a rotary file for hardened steel in a drill or die grinder for this.



Its a 40 minute job after you disassemble your trans... You will probably want to purchase and install the 2000+ shift detent as well since you already have it apart... Here is the old style for reference. The new style has deeper petals.



Last edited by cycowrencher; 1 Day Ago at 20:12..
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  #1088  
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We also grind the edge of the drum and channel the pin rides in to help keep a burr from forming. Good info cyco, these things can take a beating if you keep after em.
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  #1089  
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Thanks for sharing Cyco..
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  #1090  
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It cost me 1800+ to learn that... But the extra work done to the gears was over 1200 of that. I would get the extra work done every time with as easy as it shifts now. With that extra work i dont need a $400 magic box on mine, i use about $7 dollars in relays for my shift kill

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