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

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  #1  
Old 27th February 2021
hbkeith hbkeith is offline
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Default Rear Sprockets

Bike was running PBI Dished 2072 Aluminum made for 530 chain , then machining Sprockets to except a 520 chain , trying to make options for Sprockets easier so tried using Flat 520 Sprocket with a spacer , But the Sprocket Bolts are about rubbing the swingarm , if i remove washers from bolts there is room , but do i dare not use a bolt washer on a aluminum Sprocket ? options ?
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Old 27th February 2021
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Counter bore the sprocket and use a 12 point screw.
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Old 27th February 2021
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Default

Quote:
Originally Posted by hbkeith View Post
but do i dare not use a bolt washer on a aluminum Sprocket ? options ?
it wouldn't stop me.the hardness is way up there on those aluminum sprockets.has to be similar to steel or they would wear out quickly.if that was your concern.
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Old 27th February 2021
hbkeith hbkeith is offline
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Default

thinking about cracking at bolt holes without a washer
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Old 2nd March 2021
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Quote:
Originally Posted by hbkeith View Post
thinking about cracking at bolt holes without a washer
I would and have. Look for button head star bolts, flange on the bolt and low profile. Keep an eye on things

fwiw: I run 520 on both street bikes, flat rear sprocket, no spacers. Plenty of room
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Old 2nd March 2021
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Flat 530 without spacer was factory in 91/92 on some models
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Old 2nd March 2021
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Thanks , my swingarm is strecthed but stock width , running a 4.5" Akront wheel with 160 Stealth , front spocket is spaced out 1/2" , i needed a 1/4" spacer for rear to run flat sprocket
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Old 8th March 2021
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Quote:
Originally Posted by brucstoudt View Post
it wouldn't stop me.the hardness is way up there on those aluminum sprockets.has to be similar to steel or they would wear out quickly.if that was your concern.
I was thinking about that this weekend. Just swapped from belt on my '01 using PBI parts. I rapped on the rear sprocket (aluminium) with a knuckle, and it rang like a bell. Gotta be a pretty good alloy with a hard heat-treat.
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Old 8th March 2021
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Most likely 7075 with a hard anodized surface. The Anodizing process creates an AL2O3 ( Aluminum Oxide) layer that is a actually the same molecule that standard grinding wheels are made of.
You start with an Aluminum alloy that has a heat treated tensile strength that can be better than mild steel and then add a surface treatment that raises its abrasion resistance to that of a heat treated alloy steel with significantly less weight.
Ain’t science grand ?
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Old 8th March 2021
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You know your metals, Tim

I didn't know alum could be that hard.
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