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GX120 RACE PARTS

(Also see our GX200 Race Parts Page - Most parts will also fit GX120s),

This page has only those parts exclusive to GX120s

 
AIR FILTERS AND KITS
SEE GX200 RACE PARTS - CLICK HERE
BOLT, STUDS, & HARDWARE
Bolt Kit, High Strength Grade 10.9, Includes new high strength bolts and washers for head and side cover. Use only if studs not allowed. 120BOLTKIT $12.00
GX120 Stud Kit, Includes Head Studs, Side Cover Studs, Washers & Nuts, Solid case Dowl Pins, Mandatory for all HP applications (Note. This kit use studs only, no bolts)

120HDSTUDKT $40.00
Stud Kit for Valve Cover VCSTUDKT $10.00
SEE GX200 RACE PARTS FOR ADDITIONAL HARDWARE - CLICK HERE
BEARINGS AND CRANKS
Bearing, Crankshaft (Block & Side Cover), Ceramic Ball & Cage (Special Order)*

7866 $249.00
Bearing, Crankshaft (Block & Side Cover), Ceramic Ball, Chrome Steel Cage, ABEC 7 (Special Order)*

8248 $119.00
Bearing, Crankshaft (Block & Side Cover), Ceramic Ball, SS Cage (Special Order)* 7549 $59.00
Bearing, Crankshaft (Block & Side Cover), Self Aligning (Special Order)*

120SABEAR $30.00
Bearing, Case, GX120, Special Race - loose Free Spinning, These are OEM bearings that have had the Balls and race ground for an extra .001" to .002" clearance. This helps to free up the crank, eliminate any bind, and spin free.   120FREEBEARING $40.00
Camshaft GX120s

Our cams are specially developed for Honda GX engines using flow bench and dyno testing. They are not copies of Briggs (or other) like many of the other cams on the market. All cams can be custom ground for ICL and LS to tailor performance to your specification.

Cams use either Genuine Honda Cores or a Aftermarket core depending on application. Cams 274, 280, 285, 294, and 320 series may require grinding of block to install.

All GX120 Racing Cams are special order. Allow 1 week to ship.

228 SERIES (Cheater Grind).

Cam ground for for classes with lift only rules. Factory lift of .228/.230 with approx 10 degrees more duration. Factory Center Lines.  Near Stock idle. Cam will pass visual inspection but may not pass technical (i.e. profile measurement). 18lb Springs Required.

Camshaft GX120, 228-120  Cam is ground on genuine Honda 120 core NRC-228-120 $139.00
230 SERIES

Welded and ground for classes with lift only rules. Approx .230 lift with 30 degree more duration than stock. Significant power increase over stock while maintaining factory lift. Cam may have noticeable idle . Cam will not pass visual inspection. 18lb Springs Required, 26 recommended. Cam is BOLT IN and does not require block modifications yet keeps stock base circle to maintain correct valve train geometry.

Camshaft GX120, 230-0207 SPECIAL HIGH TORQUE GRIND FOR SMALL TRACKS, 5500 rpm, 18 lb Springs Required, 26 recommended. 10 to 1 Compression or higher* NRC-230-0207-120 $119.00
 Camshaft GX120, 230-0607 All around grind for medium to large tracks. 6500 rpm, 26 lb Springs required recommended. 10 to 1 Compression or higher* NRC-230-0607-120 $119.00
 Camshaft GX120, 230-0211 SPECIAL HIGH TORQUE GRIND FOR SMALL TRACKS, 5500 rpm, 18 lb Springs Required, 26 recommended.. 9.5 to 1 Compression or lower* NRC-230-0211-120 $119.00
 Camshaft GX120, 230-0611 All around grind for medium to large tracks. 26 lb, 6000+ RPM S18 lb Springs Required, 26 recommended. 10 to 1 Compression or lower* NRC-230-0611-120 $119.00
252 SERIES

Approx .252 lift and 230 degrees duration (at .050). Welded and ground cam provides significant power improvements over stock cam. Works best with mild motors using bored OEM or aftermarket carbs. Cam is BOLT IN and does not require block modifications yet keeps stock base circle to maintain correct valve train geometry. 26lb springs should be used. Great with 1.3 rockers. Our number one seller.

Camshaft GX120, 252-0207 SPECIAL HIGH TORQUE GRIND FOR SMALL TRACKS, 6000 rpm, 18 lb Springs Required, 26 recommended. 10 to 1 Compression or higher

This is one of the best choices for low end power, esp on small dirt tracks with heavy drivers.

NRC-252-0207-120 $119.00
 Camshaft GX120, 252-0607 All around grind for medium to large tracks. 6500 rpm, 26 lb Springs required recommended. 10 to 1 Compression or higher* NRC-252-0607-120 $119.00
 Camshaft GX120, 252-1007 High RPM Grind for Large tracks. 7500+ rpm, 26 lb Springs required  11 to 1 Compression or higher* NRC-252-1007-120 $119.00
274 SERIES

Radical cam grind . Approx .274 lift and 260 duration. Square lobe design to maximize valve opening time. While meant to use with larger carbs, it actually works very good with smaller carbs by holding open the valve as long as possible with reduced lift to maximize velocity. Block must be clearanced to install. Stock base Circle.

Camshaft GX120 274-0607,  800 RPM, 12 to 1 or higher compression ratio required, Small to medium tracks and all road courses, 26 lb Springs Required. Warning - May cause traction problems. NRC-F200 -0607 $119.00
Camshaft GX120 274-1007,  9500+ RPM, 12 to 1 or higher compression ratio required, Recommended for serious competition.  Use for large ovals or where traction is a problem, 26 lb Springs Required NRC-F200-1007 $119.00
CARBURETORS, CARB KITS, AND FUEL PARTS
Carburetor, GX120 Bored Out and circuitry reworked* (~15.5 mm). Adds over 1 hp on GX160s. Adjustable jet recommended.

(Bored GX200 carbs are preferred when possible)

 

NR120OSCARB $135.00
SEE GX200 RACE PARTS FOR ADDITIONAL CARBS - CLICK HERE
FLYWHEELS & FANS
Flywheel, Billet Aluminum and Adjustable Timing*

RMALFY $250.00
Flywheel, charging (includes flywheel with magnets and lighting coil)   TO120LCFLY $99.00
GASKETS (See Stock Parts for Additional Gaskets)
Gasket, Head .041 ~ .042 (QMA Legal

 

120HG .041 $18.00
Gasket, Head .038 ~ .040 (not QMA Legal 120HG .038 $18.00
Gasket, Head GX120 1.0 mm (UK Spec) 120HG 1.0 $18.00
Gasket, Head .045 ~ .046 120039 $8.00
HEADS, CYLINDER HONDA -  All heads use Genuine Honda cores

(after ordering, send an e-mail to nrracing@comcast.net with amount to be milled and any special request)

Race Head, Level 1 Cylinder head, Ported and Milled (Choice of .050 or .080), Stock valves (3 angle), 18 or 26 LB Springs, OEM Retainers (REV Kit), New

NRCH120L1

SPECIAL

$149.00

Race Head, Level 4 Cylinder head, Oversize SS valves, 26 lb Springs, Ported and Milled to choice of compression ratio,  New NRCH120L4

SPECIAL

$179.00

IGNITION AND TIMING
SEE GX200 RACE PARTS FOR TIMING AND IGNITION COMPONENTS - CLICK HERE
PISTON AND RINGS
PUSHRODS
GX120 Pushrods, Chrome Moly, Best Pushrods available, Pair CMPR120 $30.00
GX120 Pushrods, Chrome Moly, .100" Shorter for Roller Rockers, Also recommended for Billet rockers and/or when heads are milled more than .060", Pair CMPR120-100 $30.00
SEE GX200 RACE PARTS FOR ADDITIONAL PUSHRODS/KITS - CLICK HERE
ROCKER ARMS
Rocker Arm, Low Friction with Pivot. These are OEM Rocker Arms and Pivots that have been lapped and treated to reduce friction. Undetectable, each

NRRCKPVT $20.00
SEE GX200 RACE PARTS FOR ROCKER ARMS - CLICK HERE
RODS, CONNECTING
Rod Connecting, GX120 OEM Honda Race Prepped (Not QMA Legal)

120NRRODPR $60.00
Rod Connecting, Billet GX120, 2.874" Long

120ARCROD $79.00
VALVE SPRINGS AND COMPONENTS (including, Retainer Lash Caps and Shims)

 

SEE GX200 RACE PARTS FOR  VALVE SPRINGS AND COMPONENTS - CLICK HERE

VALVES AND COMPONENTS

See Valve Packages for Additional Selections

Valve, Intake, Stainless, 24 mm, Stock Length, Lightweight, High Flow, Hardend tips (Lash caps not required) - can use existing seat, but must be cut VAL24-120 $16.00
Valve, Exhaust, Stainless, 16mm ( Stock Size), 16mm, Lightweight, High Flow, Hardend tips (Lash caps not required)   VAL120ESS $40.00
SEE GX200 RACE PARTS FOR OTHER VALVES - CLICK HERE
Part/Model numbers are for reference only and are subject to change. Actual part may have a different number, however it will be latest available part and will match description. If you require an exact part number (i.e. for class or rule requirements), please e-mail.

 

Parts Descriptions followed by an * are special order and may take 1 to 2 weeks to get.