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Steel Thunder Custom Cycles
3418 Teagues Road
Marshfield, MO 65706
417-468-2326

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Sportster Engine Parts  

Sportster Pages

9.5:1 compression BIg Bore Cylinder Kit for 883 to 1200 Sportster XL. Prefit cylinders with pistons, piston rings, head and base gaskets.

VT11-0595

Motor Shop BIg Bore Cylinder Kit for Sportster XL , 9.5:1 compression.

VT11-0473

Piston Set for Sportster

VT11-9885

Piston set for XL

VT11-1680

piston set .005

VT11-1700

No Headwork Necessary!

 

9.5:1   883-1200 Big Bore Cylinder Kit - V-Twin Motor Shop

1200cc XL Sportster Conversion Cylinder and Piston Set includes 2 silver finished cylinders or black wrinkle with milled edge fin cylinders with fitted Wiseco or Sifton moly 9.5:1 reverse dome piston and ring set with base and head gasket included.  Order Rocker Box Gasket Set separately.

Each Kit includes:

  • 2 Pre-Fit Cylinders with pistons and matching Hastings Piston Rings
  • 2 Head Gaskets
  • 2 Base Gaskets
  • 9.5:1 Compression

These Big Bore Kits do not require any machining. Choose from chart below.  Prices include FREE SHIPPING*:

Part# Type Cylinder/Piston Kit Finish Years Price Buy Now
VT11-0473 Wiseco Silver  1986-03  $481.73
VT11-0355 Wiseco Black  1986-03  $481.73
VT11-0595 Sifton Moly Black  1986-03  $481.73
VT11-0551 Sifton Moly Silver  1986-03  $481.73
VT11-1104 Sifton Silver  1986-03  $446.20
VT11-1105 Sifton Black  1986-03  $446.20
VT11-0346 Wiseco Silver  2004-up  $481.73
VT11-0347 Wiseco Black  2004-up  $481.73

PISTON SETS available separately:

Part# Item Brand Price Buy Now
VT11-9885 Piston Set Only Wiseco $264.17
VT11-1680 Piston Set Only Sifton $143.22
VT11-1700 Piston Set .005 Sifton Moly $152.30

10 to 1 compression big bore kit for 883-1200 XL Sportster

 

No Headwork Necessary!

10:1 883-1200 Big Bore Conversion Cylinder Kit - V-Twin Motor Shop

1200cc XL Sportster Conversion Cylinder and Piston Set includes 2 silver finished cylinders or black wrinkle with milled edge fin cylinders with fitted Wiseco 10:1 piston and ring set with base and head gasket included.

Each kit includes:

  • 2 Pre-Fit Cylinders with pistons and matching Hastings Piston Rings
  • 2 Head Gaskets
  • 2 Base Gaskets
  • 10:1 Compression

These Big Bore Kits do not require any machining. Choose from chart below.  Prices include FREE SHIPPING*:

Part # Finish Fitment Price Buy Now
VT11-0565 Silver 1986-2003 $489.99
VT11-0589 Black 1986-2003 $481.73
VT11-0336 Silver 2004-up $481.73
VT11-0337 Black 2004-up $481.73
Engine cylinder for evolution xl sportster.

ENGINE CYLINDER FOR EVO SPORTSTER - V-FACTOR

Cylinders can be used for front or rear applications.
Finish honed to standard size.
Includes cylinder stud inserts for head alignment.
Note: Not intended for high performance applications.
Natural finish.
Replaces HD# 16447-88

Part #: M60110 - Fits XL Evolution 1200cc 1988/2003,  Sold Each ... $165.79 including shipping*

Sportster XL Performance Pistion Kits from Keith Black (KB).
PERFORMANCE PISTON KITS FOR SPORTSTER - KB (Keith Black)

Evolution is the key word as these Keith Black Performance Piston Kits were spawned from this successful manufacturer's line of automotive pistons. Machined in the USA, these lightweight permanent mold cast pistons are manufactured from Hypereutectic 390 Alloy, contain 16-18% silicon, and are heat treated to T-6 specifications producing a stronger than stock piston. This special alloy keeps heat confined to the combustion chamber and reduces heat transfer to the piston itself. The result is a cooler running piston that can be fit to the bore tighter. Piston expansion is reduced by as much as 20% over conventional pistons. These tighter fitting pistons rock less, support the rings better, are more durable and retain compression better for maximum power. The key feature to these pistons is the accumulator groove between the top and second ring. This groove between the rings tends to average the normal pressure between the first and second ring, keeping the pressure low enough to prevent lifting of the top ring while maintaining preload on the second (oil scraping) ring. Each set of pistons include: wrist pins, spiral locks, engine assembly lube, and Hastings Moly rings. All wrist pins are .792" O.D. Sold in pairs. Machined in the U.S.A.
Model & Year Description Bore Size Part # Buy Now

Fit Ironhead Sportster 1972/1985, 

Note: It is not recommended to bore 1972/Early 1973 models more than +.030"

PRICE EACH KIT: $199.95 INCLUDING SHIPPING*

Dome Top Pistons, 9:1 Compression Ratio, 1000cc (61CI), STD Bore = 3.188" STD

M62402

+.010"

M62404

+.020"

M62405

+.030"

M62406

+.040"

M62407

Fit Evolution Sportster 1988/2003

PRICE EACH KIT: $171.30 INCLUDING SHIPPING*

Flat Top Pistons, 9:1 Compression Ratio , 1200cc (74CI),
STD Bore = 3.498"
+.010" M62274
+.020" M62275
+.030" M62276
Flat Top Pistons w/Valve Pockets cut .060" deeper for use w/shaved heads & high lift cams, 9:1 Compression Ratio, 1200cc (74CI), STD Bore = 3.498"
+.010" M62431
+.020" M62432

Fit Evolution Sportster 1986/Later

883cc to 1200cc, Overbore Conversion

PRICE EACH KIT: $184.63 INCLUDING SHIPPING*

Dish Top Pistons (do not require head modification), 9:1 Compression Ratio, 1200cc (74CI), STD Bore = 3.498"

STD M62290
+.005 M62291
+.010 M62292

Wisco Piston Kits for Sportsters come with top quality rings and ring locks.

Parts included in all Piston Kits

Wisco pisont for Ironhead sportster.

Ironhead Piston Style

Wisco piston for Evo Sportster, overbore to 1200cc, reverse dome.

Evo XL 86/L Reverse Dome 9.5:1

Wiseco piston kit for Evo sportster 10:1 compression,

Evo XL 86/L Reverse Dome 10:1

Wisco piston kit for Sportster Evo 88/03, domed.

Evo XL 88/03 10.5:1

 

PISTON KITS FOR SPORTSTER - Wisco

All Wiseco pistons are forged from hi-silicon aluminum alloy for superior strength and dependability. The unique piston shape allows tight piston to wall clearances for quieter operation. This shape combined with a top quality ring package and computerized machined anti-detonation grooves offers you the most technically advanced piston kits available. Wiseco pistons are available with either Hastings X Style or Wiseco XC Style piston rings.

All piston kits listed are designed to be used with stock stroke flywheels only. Most Wiseco pistons are machined with valve pockets that are deeper and larger than stock. These pockets provide adequate valve clearance for most high lift cams, but as with any high performance upgrade all clearances must be checked.

All 883cc to 1200cc overbore and 84ci Big Bore kits do not require cylinder head modification or flywheel rebalancing unless deemed necessary by the service technician. The 84ci Big Bore kits require Big Bore cylinders and crankcases must be bored to accept the larger cylinders.
Piston Kit, made in the U.S.A.  PRICES INCLUDE FREE SHIPPING*

(+ = how much over stock)

Model & Year Size Piston Kit # Price Buy Now

Ironhead Sportster 1972/Later 1000cc

10:1 compression

3.188" standard bore

Standard M62126 $249.86
+.010" M62127 $249.86
+.020" M62128 $249.86
+.030" M62129 $249.86
+.040" M62130 $249.86
Sportster Evolution 1986/Later. 883cc & 1100cc overbore to 1200cc reverse dome, 9.5:1 compression, 3.497" standard bore Standard M62249 $285.62
+.010" M62250 $285.62
Sportster Evolution 1986/Later. 883cc & 1100cc overbore to 1200cc reverse dome, 10:1 compression, 3.497" standard bore Standard M62457 $285.62
+.010" M62458 $285.62
Evolution Sportster 1988/2003. 1200cc domed 10.5:1 compression. 3.497" standard bore Standard M62460 $277.92
+.010" M62461 $277.92

Rocker Arm Cover for Sportster Evolution 86/03.

Rocker Arm Cover for Sportster Evo 86/03

ROCKER ARM COVER ASSEMBLIES FOR SPORTSTER EVOLUTION

These chrome plated Evolution Rocker Arm Cover Assemblies are made from precision die cast aluminum. Shown below as completely assembled and disassembled. Assembly includes gaskets and 4 top cover screws. Sold as one complete assembly for one head or, to complete the job order the part number for a pair. All pairs of rocker arm cover assemblies include rocker cover bolt kit.
Fits Sportster Evolution 1986/2003. Each. Part#:M60608 ... $197.99 including shipping*

Customizing kit fits 2004 and Later Sporster.

2004-up Dress Kit for Sportster

Customizing kit includes all die cast replacement parts as pictured (cam cover, primary cover, inner and outer rocker box covers and transmission side cover). #VT42-0940 - Fits XL 2004/L ... $1231.56 including free shipping.*

GB o-ring Gasket set for Sportster Evo.

VT14-0931

Cork gasket set for Evo Sportster.

VT15-0317

Gasket Kits

Rocker Cover Gasket Kits for Evo include upper and lower gaskets in Cork or Molded O-Ring type with bolt seals and washers for both heads.

PRICES INCLUDE FREE SHIPPING WHEN PURCHASED WITH PISTON KIT. NOT AVAILABLE ALONE ONLINE.  IF YOU WISH TO PURCHASE SEPARATELY, PLEASE CALL 1-866-889-7828;  SHIPPING WILL BE ADDED.

Part # OEM Type Fitment Price Buy Now
JAMES GASKETS
VT15-0862 17030-89 O-Ring 86-90, 883-1100-1200 $49.83
VT15-0863 17030-91 O-Ring 91-up, 883-1200 $49.83
GB GASKETS
VT15-0317 17030-86R Cork 86-90, 883-1100-1200 $27.22
VT14-0931 17030-91 O-Ring 91-up, 883-1200 $32.67
ALSO AVAILABLE (BY PHONE ORDER ONLY):

Reverse Pattern Drum Kits
Convert your existing 91-up 5-speed or BAKER XL6 to reverse pattern shifting. Our 1-up, 4-down or 1-up, 5-down shift drum kits give lightning fast upshifts, something racers have known for years. Kits include a drum, billet detent plate, and low effort spring.

P/N 291-6 is a no cost option with purchase of a 201, 202, or 203 XL6 kit; add and "R" to the P/N.
CALL TO ORDER TOLL FREE: 1-866-889-7828, 9-5 CST, M-F.

Reverse Pattern Drum Kits
26 Tooth Pulleys
Stock Sportster/Buell transmission pulleys are made of cast iron in 27 and 29 tooth configurations. Replace your stock 27 tooth pulley with our 26 for an instant 4% increase in torque to the rear wheel.
(The 28 tooth pulley has been discontinued.)

In addition to 4% more torque to the rear wheel, our pulleys are lighter and stronger than stock. Less weight translates to reduced "flywheel effect" and quicker revs. Weight comparison:

Stock 27 tooth cast iron pulley ... 2.875 lbs

Long life pulley, 26 tooth ... 2.375 lbs

#292-56F - Long Life Pulley, Steel, 26 Tooth ...$142.84 including shipping*

28 tooth pulley from Baker Drivetrain

Install one of these pulleys with our XL6 to significantly increase the performance of your Sportster/Buell and reduce the cruising RPM.

CALL TO ORDER TOLL FREE: 1-866-889-7828, 9-5 CST, M-F.

 

Billet 5-Speed Door
If you are doing any serious performance upgrades to your motor, don't forget about your transmission. Our 6061-T6 trap door is three times stronger than the stock die-cast door in the critical area in-between and around the mainshaft and countershaft door bearings. Our transmission design expertise makes our 5-speed door the best trap door available, period.
Application: 91-up Sportster®/Buell®, P/N 299-5 ...$260.99 including shipping*

 

Billet 5-speed door

CALL TO ORDER TOLL FREE: 1-866-889-7828, 9-5 CST, M-F.

BAKER™ Sportster® 5-Speed Builder's Kits

  • BAKER 6061-T6 billet trap door.
  • Andrews aircraft alloy gears. Dog teeth have lead-in ramps for smoother shifting.
  • BAKER shift drums with conventional shift pattern (1-down, 4-up) or reverse pattern.
  • BAKER billet detent plate and low effort spring.


P/N - Description
101 - Stock ratios; see XL6 section of this page
111 - 2.61 1st, stock 2nd-5th, 47 MPH in 1st
121 - 2.37 1st, 1.88 2nd, stock 3rd-5th; 52 MPH in 1st gear, 66 MPH in 2nd
131 - 2.03 1st, 1.67 2nd, 1.36 3rd, 1.16 4th, stock 5th, 61 MPH in 1st, 74 MPH in 2nd, 91 MPH in 3rd, 107 MPH in 4th

Price each: $1,540.50 including shipping*
Speed calculations based on a 3.61 primary/secondary reduction at 6000 RPM
*Add a "R" suffix for reverse pattern drum and detent plate; no cost option.

BAKER 5-speed builder's kit

CALL TO ORDER TOLL FREE: 1-866-889-7828, 9-5 CST, M-F.

More Sporster Specific Items and Links in The Sportster Pages.

*FREE SHIPPING APPLIES IN CONTINTENTAL 48 UNITED STATES ONLY. AK, HI and APO/FPO will have additional shipping fees. We ship only within the U.S.A. and to APO/FPO (military addresses; weight and size restrictions apply.). We do not accept foreign credit cards. Sorry, we do not ship to Puerto Rico.

Prefer to call in your order to Steel Thunder? Call toll-free: 1-866-889-7828. 9-5 CST M-F.

FREQUENTLY ASKED QUESTIONS

Please note that all prices are subject to change.

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Steel Thunder Custom Cycles

3418 Teagues Road

Marshfield, MO 65706

417-468-2326

We hope you'll come visit us ... we'd love to see your ride!

 

 

With God All Things are Possible!

 

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