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  #1  
Old 14th October 2013
hcw3 hcw3 is offline
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Join Date: Jun 2013
Posts: 80
Sportster/Buell Model: xr1200x
Sportster/Buell Year: 2011
Sportster/Buell Model #2: XL1200s
Sportster/Buell Year #2: 1999
Other Motorcycle Model: KTM 450SMR
Other Motorcycle Year: 2005
Reputation: 8478
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Default new '99 xl1200 sport race conversion

Picked up this 99 XL1200 Sport today. I'm going to turn it into a road race machine to run in the AHRMA transatlantic class.

Immediate plans are a 2 into 1 high pipe, clips-ons, rear-sets, and an xr750 tail. Longer term i''d like to get a set of SuperLow wheels so I can run an 18" front wheel and maybe even EFI. The class rules specifically prohibit me from using XR parts...

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  #2  
Old 14th October 2013
Rico 05R's Avatar
Rico 05R Rico 05R is offline
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Sportster/Buell Model: NRHS Stage II 1250-R
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Subscribed, this should be a fun project to watch.
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  #3  
Old 14th October 2013
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sportsterpaul sportsterpaul is offline
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Sportster/Buell Model: XL1460C
Sportster/Buell Year: 2000
Sportster/Buell Model #2: XL1200R
Sportster/Buell Year #2: 2006
Other Motorcycle Model: XL1200R
Other Motorcycle Year: 2004
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With any luck we'll be able to see you run.
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  #4  
Old 14th October 2013
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Brianmac883 Brianmac883 is offline
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Sportster/Buell Model: XL883R
Sportster/Buell Year: 2002
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Subscribed as well. Looking forward to following this one!
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Brian

2002 XL883R – Screamin' Eagle Pro 2 into 1 * SE A/C * Re-jet - stock main, 45 slow * Goodridge SS brake lines

Sportster: Blowing away Big Twins since 1957

“Life is short… break the rules, forgive quickly, love honestly, laugh easy, keep it simple, ride often, ride free and never regret anything that makes you smile.”
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  #5  
Old 14th October 2013
NRHS Sales NRHS Sales is offline
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what mods are you allowed to do internally?
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  #6  
Old 14th October 2013
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steelworker steelworker is offline
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Sportster/Buell Model: XL1250S
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Found the rules here, Dan.

Bore must be stock, aftermarket cylinders not allowed, updating and/or backdating of parts is allowed, but XR1200 parts are specifically not permitted.

Aftermarket air filter or air cleaner can be used. Aftermarket exhausts can be used.
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Old 14th October 2013
NRHS Sales NRHS Sales is offline
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can he put in forged pistons and different cams or is he only allowed to use OEM parts?
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  #8  
Old 14th October 2013
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ReddTigger ReddTigger is offline
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Sportster/Buell Model: XLH-1208
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Quote:
e) THRUXTON TRANSATLANTIC CHALLENGE: The Thruxton TransAtlantic Challenge follows AHRMA Supersport rules (see 9.8.1) with the following exceptions:
1) Stock fuel tank, sidecovers, seat cowl and fenders must be retained in the stock location. Sidecovers may be modified or replaced if high-mount exhaust pipes are used. No additional fairings, bodywork, streamlining or ducting may be added.
2) Stock headlight shell must be retained in the stock location.
3) Stock gauges must be retained in the stock location. Speedometer may be removed.
4) Stock seat pan must be retained, although the padding and/or covering may be modified.
5) Inner rear fender may be removed.
6) Cylinders must be stock bore—no overbore allowed.
7) Electric shift devices (quick shifters) are not allowed.
8) Secondary air system may be removed.
9) All motorcycles must use three white 10 x12-inch number plates with black numbers (see 9.5.8 and 9.8.1.e.6). Numbers may be applied to the front and rear cowl if so equipped. Sharkskin front number cowl is allowed.
10) Treaded racing tires required. No slicks or hand-cut slicks allowed. Rain tires may be used.
11) Updating and/or backdating of parts is allowed.
12) The 865cc Triumph Bonneville may be raced in the Thruxton TransAtlantic Challenge provided it is properly modified to the Thruxton configuration. These modifications specifically include the Thruxton seat and cowl, change handlebars to clip-ons, upgrade of the braking components, installation of rearsets, etc.

In addition to the above rules, these rules apply specifically to the Harley-Davidson XL883 and XL1200 Sportster:
i) May displace up to 1204cc using Harley-Davidson or Buell cylinders with a maximum bore of 3.5 inches. Aftermarket cylinders are not allowed.
ii) OEM seat and rear fender may be replaced with an XR750-style one-piece seat/fender unit.
iii) Gas caps and oil tank caps must be secured by either duct tape or safety wire.
iv) All front fender rivets must be drilled out and replaced with nut-secured bolts.
v) Belt drive final drive may be replaced with conventional sprockets and chain.
vi) Aftermarket air filter and/or aftermarket air cleaner may be used. No scoops or ducting allowed.
vii) Aftermarket ignition module is allowed.
viii)The Harley-Davidson XR1200, or any of its components, is not allowed.
Machines must meet all standards as noted in section 3.3, 9.3, 9.4, 9.5, and 9.8.
Quote:
9.8 MECHANICAL REQUIREMENTS FOR BATTLE OF TWINS,
SOUND OF SINGLES AND SOUND OF THUNDER
a) Engine modifications: Unless specified, there are no restrictions on engine modifications. A competitor may modify the engine to any degree, as long as the class displacement limits are not exceeded. Engines may not have their bore and/or stroke reduced to meet class limits. Engines must be naturally aspirated (no turbos or superchargers), except four-stroke singles in Sound of Thunder.
b) Frames
1) Any frame manufactured by an OEM or any reputable aftermarket frame manufacturer is allowed. Custom frames are eligible, but only the highest standard of workmanship will be permitted. Frame modifications are allowed; however, they must be declared and brought to the attention of the Tech Inspector for inspection of quality and eligibility. Any frame considered inadequate by the Tech Inspector will not be allowed to race. This decision may be appealed to the Race Director only at that event. Contact the AHRMA office for clarification of confirmation of eligibility.
2) Frame modifications: Gusseting and strengthening is allowed, as long as it is done in a professional, safe, workmanlike manner.
3) Swingarms may be strengthened or changed to a different style or type, provided they are safe and tight in the frame.
4) Frames shall be free of cracks and kinks.
5) All welds shall be structurally sound.
c) Wheels: Rim diameter must be no smaller than 16 inches. Rim width should comply with the tire manufacturer’s recommendations.
d) Tires: Slicks, DOT or rain tires may be used. Riders should refer to their specific class rules to determine the type of tires legal for that class. Tires must be of a modern racing compound and must not show excessive wear. Tire warmers are permitted.
e) Brakes: Efficient front and rear brakes are required.
f) Suspension: Motorcycles must have both front and rear suspension.
g) Exhaust: All machines must be equipped with effective silencers and exhaust systems must include sound attenuation material or devices. Open pipes and reverse cone megaphones are not effective silencers. Exceptions may be granted for exhibition purposes only. All exhaust systems must exit toward the rear of the motorcycle.
Sound testing will take place at all AHRMA national events. This will be a pass-by test at a section of the circuit where machines are under full throttle. As dB(a) levels differ from circuit to circuit due to background and distance, only the worst offenders will be notified. Failure to meet track-imposed noise limits may result in disqualification from the day’s event and no refund of entry fees. These results will be posted and published in Vintage Views. At tracks where noise limits are in effect, AHRMA will adhere to the track’s policy.
h) Fluids and fluid control
1) All liquid-cooled machines must use only water or “WaterWetter” for cooling. Antifreeze, ethylene glycol or other additives are prohibited. A separate catch tank of at least 6 oz. must be fitted to catch any overflow.
2) All fluid plugs and fittings with oil or coolant behind them must be securely fastened or safety wired.
3) A 6-oz. minimum catch tank or reservoir must be provided for any breather hoses venting the following: cam box or top end, crankcase, primary, transmission and oil tanks. Such catch tanks must be situated so that they will not normally overflow.
4) All tanks, whether for fuel, oil or coolant, must be leak-free and securely mounted
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71.3 hp 70.8 tq

1208cc 11.09:1 (Wiseco 10° Dome 10.5:1 .010 over) ,Screamin Eagle Dual Plug Heads (10° 61cc), Original SE A/C, Vance & Hines Straight Shots w/ Custom Baffles. SE 6800 ign, Dual BREMBO brakes/ Pirelli Night Dragon MU85-16 Rear - 100/90-19 Front. Progressive Springs & 412 HD 13½" Chrome Shocks, 5½" pullback riser w/ "reddtigger mount", Stebel Nautilus Compact Air horn, Mustang Vintage Super Wide Touring Seat, Alto Carbonite Clutch

Last edited by ReddTigger; 14th October 2013 at 19:45..
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  #9  
Old 14th October 2013
hcw3 hcw3 is offline
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Join Date: Jun 2013
Posts: 80
Sportster/Buell Model: xr1200x
Sportster/Buell Year: 2011
Sportster/Buell Model #2: XL1200s
Sportster/Buell Year #2: 1999
Other Motorcycle Model: KTM 450SMR
Other Motorcycle Year: 2005
Reputation: 8478
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Quote:
Originally Posted by NRHS Sales View Post
what mods are you allowed to do internally?
Very little, clean up, resurfacing, but have to stick with available as stock cams and valves

Last edited by hcw3; 14th October 2013 at 19:35.. Reason: should have finished reading the thread before copying and pasting the rulebook again.
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  #10  
Old 14th October 2013
ReddTigger's Avatar
ReddTigger ReddTigger is offline
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according to the rules, it doesn't say that you need to use stock cams, just that your bore can not exceed 3.5" maximum and must be OEM cylinders.

and there is nothing regarding compression.

also you're allowed to update/backdate parts. so you can use rubbermount heads.
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