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XR Sportster Motorcycle Talk - XR750, XR1000, XR1200 For XR Sportsters: XR750, XR1000, XR1200

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  #1  
Old 15th May 2008
duggram duggram is offline
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Default Flattrack Racing a Sportster

Does anyone know of sportsters being used for flattrack racing?

I'm talking about a stocker with mods, not an XR750. I want to make a street tracker out of my '07 1200R. My neighbor is a long time mechanic that would help me this winter making the bike convertible to dirt (lights off, front wheel brake off, ...). I was planning to use Storz parts.

883's were once an AMA pro class. Anyone have any experience from that era?

This could be a fun project. I used to TT and flattrack when I was a kid. There's no reason to get hurt, just playing around and at the least I'll have a nice street tracker next spring.

Any comments appreciated.

Doug
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  #2  
Old 15th May 2008
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Quote:
Originally Posted by duggram View Post
Does anyone know of sportsters being used for flattrack racing?

I'm talking about a stocker with mods, not an XR750. I want to make a street tracker out of my '07 1200R. My neighbor is a long time mechanic that would help me this winter making the bike convertible to dirt (lights off, front wheel brake off, ...). I was planning to use Storz parts.

883's were once an AMA pro class. Anyone have any experience from that era?

This could be a fun project. I used to TT and flattrack when I was a kid. There's no reason to get hurt, just playing around and at the least I'll have a nice street tracker next spring.

Any comments appreciated.

Doug
Check out the AMA site. you'll see that HD is very much still active in the FLAT TRACK racing.

Last year in the pro class, HD won the top 8 spots, 9 and 10 were suzuki and 11 and 12 were HD..
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  #3  
Old 15th May 2008
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  #4  
Old 16th May 2008
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Quote:
Originally Posted by duggram View Post
Does anyone know of sportsters being used for flattrack racing?

I'm talking about a stocker with mods, not an XR750. I want to make a street tracker out of my '07 1200R. My neighbor is a long time mechanic that would help me this winter making the bike convertible to dirt (lights off, front wheel brake off, ...). I was planning to use Storz parts.

883's were once an AMA pro class. Anyone have any experience from that era?

This could be a fun project. I used to TT and flattrack when I was a kid. There's no reason to get hurt, just playing around and at the least I'll have a nice street tracker next spring.

Any comments appreciated.

Doug
I have an '07. The rubber mounted rear motor mount is a problem on the newer frame. The rear motor mount is on 2 rubber donuts on the swing arm. On fast acceleration the motor torque creates lateral movement in the swingarm, then wallow (rear end steer).

The parts are #18 on the engine mounts page on the dealer Sporty parts book.

It may not make a difference on dirt, the slip may mediate the problem. However, sticky road tires w performance shocks does magnify the issue.
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  #5  
Old 20th May 2008
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Ralphthe3rd Ralphthe3rd is offline
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Arrow Flattrack Racing Sportsters...

Unfortunately the era of Racing Sportsters in Flattrack ENDED in 2005. There are still a few Supertrackers running 1200cc XL and Buell tuber engines, but their frames are purpose built race frames, and are closer to XR750 Race frames than they are to XL frames. BTW- the 883 series ended in '05 because of the introduction of the Rubbermount XL's in '04 which are totally UNSUITABLE for Flattrack racing.
FYI, the H-D 883 Sportster Performance Series was a support class run by the AMA in conjunction with the Grand National Championship series.

H-D 883 Series Champs from '93-'05 (2005 was Last Year for Series)

1993- Ricky Graham of Salinas Valley, CA (RIP)

1994- Scott Stump of Warminster, PA

1995- Mike Hacker of Carson, VA

1996- Eric Bostrom of El Segundo, CA

1997- Dave Camlin of Rock Island, IL

1998- Jess Roeder of Monroeville, OH

1999- Willie McCoy of Justin, TX

2000- Willie McCoy of Justin, TX

2001- Bryan Smith of Flint, MI

2002- Jared Mees of Honeybrook, PA (Great Kid)

2003- Scott Scherb of Decatur, TX

2004- Christopher Hart of San Jose, CA

2005- Scott Stump of Warminster, PA
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  #6  
Old 21st May 2008
duggram duggram is offline
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Quote:
Originally Posted by Ralphthe3rd View Post
BTW- the 883 series ended in '05 because of the introduction of the Rubbermount XL's in '04 which are totally UNSUITABLE for Flattrack racing.
Thanks for all the replies. Is there a way to replace the rubber donuts in an '07 that would make a more solid mount?

Is there anything else I could do to make the bike handle better? Longer shocks to improve fork angle?

Any comments appreciated.
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  #7  
Old 22nd May 2008
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Ralphthe3rd Ralphthe3rd is offline
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Arrow A Rubbermount will never be a Flattracker...

Sorry, but there is nothing you can do to make a Rubbermount suitable for flattrack, it would be way cheaper just to buy an old solidmount XL, then again... there is NO Sportster specific classes anymore. The only people racing a sportster based flattracker these days, would be in an Amateur Open class like the one for senior riders (age 40-up & 50-up), but most of those races are held on shorttracks and only on a 1/2mile(or mile) would a big fat sporty start working it's powerband.
Rubbermount XL's just aren't designed for Flattrack racing- plain and simple.
PS: FYI- even the old 883's were THE heaviest bikes to run in Flattrack in a few decades, but don't forget the late model rubbermounts are like 60lbs Heavier ! And most of that weight comes from the New frame and engine (aka Boat anchors).

Quote:
Originally Posted by duggram View Post
Thanks for all the replies. Is there a way to replace the rubber donuts in an '07 that would make a more solid mount?

Is there anything else I could do to make the bike handle better? Longer shocks to improve fork angle?

Any comments appreciated.
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  #8  
Old 22nd May 2008
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Quote:
Originally Posted by duggram View Post
Thanks for all the replies. Is there a way to replace the rubber donuts in an '07 that would make a more solid mount?

Is there anything else I could do to make the bike handle better? Longer shocks to improve fork angle?

Any comments appreciated.
As someone who is in the middle of finding a solution for the rubber donuts, my latest update:

Bought a rubber donut, my plan was to laser slice the center and replace with Dynel center donut to reduce squeeze. Brought it to a good machine shop that has a laser cutter.

Unfortunately, the laser can't cut that thick (3/8"). Mechanical precision slicing is only doable if rubber is frozen to -200/250 dgrees to take out flexibility. The new donut is larger than the old bagger donuts.

But HD has tried to mitigate the vibration with a stabilizer bar which is located top of the engine/frame ground. Its part #8 on the engine mounts page of the HD parts book. Tomorrow I'm going to look at the bushing (part # 6) of that stabilizer.

I leaning toward a fork damper as the final solution

That said, I agree; that the bike is not a good racing bike. I mean its cool, just can't handle fast.

BTW were the 883 racers using a HD frame? or custom.
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  #9  
Old 22nd May 2008
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Ralphthe3rd Ralphthe3rd is offline
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Arrow They were using a stock Frame per rules !

The 883 Roadracers AND Flattrackers were actually pretty close to stock specs in all areas, as the class was supposed to low cost and competitive.
I tuned an 883 Flattracker for a friend, and the rules didn't allow very much in the way of non-OEM parts swapping, so basically you just blueprinted eveything you couldn't change, and everything else that was allowed- you went with good stuff
BTW- almost all the 883 racers are now back on the roads in street legal trim.



Quote:
Originally Posted by Rags View Post
BTW were the 883 racers using a HD frame? or custom.
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  #10  
Old 24th May 2008
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Quote:
Originally Posted by Rags View Post
As someone who is in the middle of finding a solution for the rubber donuts, my latest update:


I leaning toward a fork damper as the final solution

.

Rags.....I have a Storz unit....it helps....but is NOT the final solution. I still believe like you that the flex in those bushings contribute to misalignment that exacerbates the wobble.
Bruce
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