Steel Thunder Custom Cycles Motorcycle Parts store for Harley-Davidson and custom bikes.

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

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Mikuni Motorcycle Carburetors  

Click here for S&S Carbs

Mikuni CarbsWhen it comes to fuel induction systems Mikuni has taken the scientific approach towards making more power. Some aftermarket motorcycle carburetors use butterfly throttle valves which obstruct the carburetors venturi at all throttle openings creating airflow turbulence and hindering precise air/fuel metering. The Mikuni HSR with its flat throttle slide allows for an unobstructed venturi that actually flows more air at full throttle to produce more peak power than other carburetors with bigger bores. While at smaller throttle openings the Mikunis' smaller yet higher velocity flowing venturi, together with its advanced fuel metering system provides a stronger overall powerband. Features greater (15%) air flow, enlarged needle and float bowl, adjustable accelerator pump, and enrichner system. All kits are jetted perfectly and ready to run. Included is complete installation instructions and owner's manual. Not for use with nitrous oxide systems. Will fit cruise control model bikes if cruise control is not used.
 Mikuni HSR Smooth bore carburetor kits for big twin evo 1990 and later.
HSR SMOOTHBORE CARBURETOR KITS FOR BIG TWIN EVOLUTION

42mm Mikuni Carburetor Kit for Big Twin Evolution 1990/Later. Kit includes misc. mounting hardware. This kit utilizes your OEM intake manifold, air filter, cables and backing plate.
Part#:MU82011 ... $ 387.35 including free shipping*
 Mikuni HSR smooth bore carburetor kits for Big Twin Evo , 42mm.
HSR SMOOTHBORE CARBURETOR KITS FOR BIG TWIN EVOLUTION

42mm Mikuni Carburetor Kit for Big Twin Evolution 1984/Later. Kit includes intake manifold, manifold to carburetor adapter, chrome filter cover, K&N air filter, and all mounting hardware. Uses OEM type throttle & idle cables for correct year (1984/1989 models must use 1990/1995 cables).
Part#:MU82010 ... $552.58 including free shipping*
 Mikuni HSR smooth bore carb for Twin Cam 88 models.
HSR SMOOTHBORE CARBURETOR KITS FOR TWIN CAM 88

42mm Mikuni carburetor kit for carbureted Twin Cam 88 models. Kit is designed to be used with your existing throttle cables, enrichner choke cable, intake manifold and air filter cover. Must be used with a Screaming Eagle high flow air filter kit. Fits Twin Cam 88" 1999/Later.
Part#:MU82091 ... $366.86 including free shipping*
 Mikuni performance carburetor kits for Big Twin Evo and Twin Cam 88.

HSR SMOOTHBORE CARBURETOR KITS FOR BIG TWIN EVOLUTION AND TWIN CAM 88

45mm Performance Mikuni Carburetor Kit for Big Twin Evolution. Kit includes standard length manifold, manifold to carburetor adapter, K&N air filter, chrome filter cover, mounting hardware and instructions. Fits Big Twin Evolution 1984/1999. Uses OEM type throttle & idle cables for correct year (1984/1989 models must use 1990/1995 cables).
Part#:MU82086 ...$509.98 including free shipping*

45mm Performance Mikuni Carburetor Kit for Twin Cam. Kit includes standard length manifold, manifold to carburetor adapter, K&N air filter, chrome filter cover, mounting hardware and instructions. Fits Twin Cam 1999/Later. (use 1999/Late cables)
Part#:MU82087 ... $509.98 including free shipping*

 Full Race Carburetor kit for 100 plus cubic inch engines from Mikuni.

HSR SMOOTHBORE CARBURETOR KIT FOR 100+ CUBIC INCH ENGINES

48mm Full Race Carburetor Kit is designed for 100+ ci engines. Includes adapter for two bolt S&S Super 'G' type intake manifold. Requires Big Twin 1990/1995 throttle cables. If mounting on a Big Twin Evolution 1993/Later, we recommend using our MU82438 head breather vent/air filter mounting kit (found on this page). If mounting on a TC 88, we recommend using our MU82435 mounting kit(found on this page). For maximum filtration use our MU84584 K&N brand air filter element (found on this page). This element is designed to be used with a Big Twin Evolution 8 inch round filter cover. If using a custom flat backed air filter with a 3 bolt mount, use our MU82882 adapter kit, available as an option when you click to purchase($23.48).
Part#:MU82001 ... $467.44 including free shipping*

Options:
Head Breather Vent/ filter mount for Big Twin and Twin Cam

HEAD BREATHER VENT/FILTER MOUNT FOR BIG TWIN AND TWIN CAM - Mikuni

These kits are specially designed to be used with a Mukuni HSR carburetor and our MU84584 K&N air filter (found on this page). While providing excellent crankcase breathing through the heads into the air filter, it also adds a secure mount for the carburetor and air filter.
Chrome Plated for Mikuni HSR-42, 45 or 48 carburetors.

Part #: MU82438 Fits Big Twin Evolution 1993/Later Price...$92.51

Part #: MU82435 Fits Twin Cam 1999/2006 ...$92.12

K&N High Flow air filter element for Mikuni .

HIGH FLOW AIR FILTER ELEMENT

K&N brand Filter Chargers® feature a 10 year million mile warranty and are emissions legal in all 50 states.

These high flow filters are designed to increase performance in both horsepower and throttle response by reducing air flow restriction while maintaining the filtration levels critical to ensure long engine life.
Not only will these filters improve the performance of a stock motorcycle, they are necessary when used in conjunction with performance upgrades such as low restriction exhaust, performance cam(s), carburetor kits or hotter ignition systems.

Part #: MU84584 - K&N, 7" O.D. x 3" width, Fits Mikuni HSR 42, 45 or 48mm with 8" O.D. round cover ...
$93.60

Carburetor rebuild kit for Mikuni smoothbore HS 40.
CARBURETOR REBUILD KITS FOR MIKUNI SMOOTHBORE HS 40


If you have 50,000 miles on your carburetor and are getting 50 miles to the gallon, that means 1000 gallons of gas has flowed through your carburetor. That's equivalent to over 18, 55-gallon drums of gas. It's time for a carb rebuild.
HS 40
Part#:MU82428 ... $49.89 including shipping*
Carburetor rebuild kit for Mikuni Smoothbore HSR 42 and 45.
CARBURETOR REBUILD KITS FOR MIKUNI SMOOTHBORE HSR 42 and HSR 45


If you have 50,000 miles on your carburetor and are getting 50 miles to the gallon, that means 1000 gallons of gas has flowed through your carburetor. That's equivalent to over 18, 55-gallon drums of gas. It's time for a carb rebuild.
HSR 42 & 45
Part#:MU82429 ... $53.94 ncluding shipping*
Pro Power Tube FUel Atomizer kit for Mikuni HSR Carb.
PRO POWER TUBE FUEL ATOMIZER KIT FOR MIKUNI HSR CARBURETORS

The secret is in the mist.
Increases output by up to 5 horsepower.
Enhances throttle response while improving fuel economy.
Includes main jets in sizes 165/185 for fine tuning.
Easy to follow instructions are included. Made in the U.S.A.

Part#: MU82439 - Fits Mikuni HSR Smoothbore 42 & 45mm Carburetors ... $68.85 including shipping*

We also carry S&S Carburetors and Kits.

Breathers, mounts, carb brackets, stacks, etc. can be found on Air Page.

*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.

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Steel Thunder Custom Cycles

3418 Teagues Road

Marshfield, MO 65706

417-468-2326

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