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

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  #11  
Old 2nd May 2019
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You can do that, but once you strap it down so that you only have 1 inch of travel left you may find that you don't need to. You do not want to drive the top of your fork into the bottom triple tree... As for rear shock length, just have someone pull the back of the bike up to full extension while you measure. You will probably find that you have 10.5 inch rear shocks... Get the bike on a jack and raise it up so you can pull the shocks off. Once you have done that raise or lower the bike until the rear swing arm is parallel with the lower frame rails under the engine. Then measure the distance between the two shock mounts at the center of the holes. Once you have that measurement, if it is not a readily available shock length, you can raise or lower the bike 1/4 inch to get there. The next thing is to push the tire up in the fender slowly until you have contact between any parts that are mounted to swingarm and fender or other parts mounted to frame. Then lower swing arm 1/2 inch from that point. This is your fully compressed shock length. You do not want shocks that compress more than this measurement. Now you need to weigh yourself in full track gear and add 10lbs to that weight. This is the rider weight you use to determine what rear spring weight you need. On a progressive shock this is the small number. I run a 125/175 spring with a +16 inch swingarm... You can probably get away with a 90/ 1xx. You can always order separate springs until you get it right it cost me 600$ in shocks to figure this out... I started with a 14.25 and ended up with a 12.5. I should have gone with a 13....

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  #12  
Old 2nd May 2019
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Great info cyco! This will be very helpful during setup.
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  #13  
Old 2nd May 2019
Tomcatt Tomcatt is offline
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The old school (and cheap) approach is to run struts on the rear and a strap on the front. It also has the benefit of being easily changed back for street riding.
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  #14  
Old 3rd May 2019
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Originally Posted by Tomcatt View Post
The old school (and cheap) approach is to run struts on the rear and a strap on the front. It also has the benefit of being easily changed back for street riding.


Worked for me with a stockish 883.


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  #15  
Old 3rd May 2019
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Originally Posted by cycowrencher View Post
Intamators and racetech springs for your weight correctly preloaded is absolutely the best bang for the buck...
I'm afraid that's a bit out of date... He's got a new Iron with Harleys' "cartridge on one side" forks. The cartridge actually has good damping and the forks work well with just a spring (and preload spacer) change along with fork oil.
http://xlforum.net/forums/showthread.php?t=2073068
An easy strip set-up would be a shorter right side preload spacer along with a strap to limit fork extension. The left side isn't easy to work on because you need a spring compressor, right side is easy like the damper rod forks.
You really can't slide the forks up thru the triple clamps with out getting into trouble with the lowers hitting the triple clamp.
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  #16  
Old 4th May 2019
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Originally Posted by Tomcatt View Post
The old school (and cheap) approach is to run struts on the rear and a strap on the front. It also has the benefit of being easily changed back for street riding.
Not gonna be legal at National Events... Safety Concern.
Besides... struts will Never outrun Shocks and proper set-up, Struts are for Wheeliebars..
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Old 4th May 2019
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Originally Posted by Racepres View Post
Not gonna be legal at National Events... Safety Concern.
Besides... struts will Never outrun Shocks and proper set-up, Struts are for Wheeliebars..
Yes and no. With his short shocks he has pro-squat. The suspension compresses instead of extending and planting the tire. Best thing he can do is preload his short shock so they don't compress. He has rear shocks even if they're preloaded so much they're virtually struts? To get anti-squat on a lowered sportster you'd have to raise the swingarm pivot the get a useful swingarm angle. Longer shocks (so it's not very low anymore...) or frame surgery.
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  #18  
Old 4th May 2019
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Quote:
Originally Posted by Tomcatt View Post
Yes and no. With his short shocks he has pro-squat. The suspension compresses instead of extending and planting the tire. Best thing he can do is preload his short shock so they don't compress. He has rear shocks even if they're preloaded so much they're virtually struts? To get anti-squat on a lowered sportster you'd have to raise the swingarm pivot the get a useful swingarm angle. Longer shocks (so it's not very low anymore...) or frame surgery.
Go to the Harley Drags and watch Hot Street and Outlaw Street....
Jump right in if ya wanna...
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Old 6th May 2019
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Quote:
Originally Posted by Racepres View Post
Not gonna be legal at National Events... Safety Concern.

Besides... struts will Never outrun Shocks and proper set-up, Struts are for Wheeliebars..


What’s the safety concern Marty? 1250 SS bike went 9.45 last week in SS with struts. Although I do think shocks are a better option. He’s cut some mid 1.30 60s too.


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Old 7th May 2019
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Quote:
Originally Posted by madnss View Post
What’s the safety concern Marty? 1250 SS bike went 9.45 last week in SS with struts. Although I do think shocks are a better option. He’s cut some mid 1.30 60s too.


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Most folks can't trick ride quite like you... We don't like cleaning up after a Mishap... Experience teaches that Struts are much more likely to cause problems than cure anything... Besides...like you say... experience also teaches that suspension is the "way" to better control, and better Times..
Everyone should afford themselves the opportunity to at least attend the Real Harley Drags, like you did... But... Geography is an enemy of Participation...


BTW, That SS Class was a Pleasant Surprise!!!
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