The following are a list of "off the shelf" parts that can be easily fitted to the GX160/GX200 engine to improve performance.  Although some of these modification are not legal for MSA racing (or clubs which adopt the Honda Regulations), if you just race for fun then adding one or a combination of these parts will improve performance.  If you are unsure check out the Honda Regs here or discuss with your club scrutineer.

Rev Kit 1
(Valve train upgrade kit up to 6500rpm)

• Stainless Steel Inlet and Exhaust Valve (standard size and length)

• Aluminium Valve Collets and split keepers

• Lash Caps

• 18lb Valve Spring

• 1:3 Rocker Arms

Our Price: £

Stock Available:  

Rev Kit 2
(Valve train upgrade kit up to 8000rpm)

• Stainless Steel Inlet and Exhaust Valve (standard size and length)

• Aluminium Valve Collets and split keepers

• Lash Caps

• 26lb Valve Spring

• 1:3 Rocker Arms

• Chrome Molly Push Rods

Our Price: £

Stock Available:  

Fitted with 95 Main Jet & 15 Pilot Jet

Please note:  This carb requires a carb adapter in order to fit onto the cylinder head. 

A range of Main Jets and Pilot Jets will be available soon to enable you to tune your carb.

Click here to download Mikuni Tuning Manual.

Our Price: £

Stock Available:  

Carb Adapter


Carb Adapter.  Allows Mikuni Carb to be fitted to GX160 and GX200 engines.  Will also enable the GX390 Carb to be bolted to the GX160 or GX200 Engine.

The Carb Adapter includes a Pulse Pump Take-off.  This can be blanked off if not required.

Part #Carb_Adapt

Our Price: £

Stock Available:  

Mikuni Air Filter

Aftermarket Performance Air Filter For Mikuni Carb

Part #Air Filter Perf

Our Price: £

Stock Available:  

Honda GX160 & GX200 Billet Con Rod

Part #Billet-1

Our Price: £

Stock Available:  

GX200 Carb

Genuine Honda GX200 Carb.

Part #16100-ZOV-811

Our Price: £

Stock Available:  

Note: Depending on your level of tune some re-jetting may be required.  We recommend replacing the Emulsion Tube for the GX140 Emulsion Tube (Part Number 16166-ZE1-005), changing the Main Jet to #90 and changing your Pilot Jet to #40

Carb Adapter (GX160/GX200 Engines)

Honda GX160 & GX200 Air Filter Adapter

Part #Air_Adpt

Our Price: £

Stock Available:  

Aftermarket Performance Air Filter For GX160 & GX200 Carbs.  To Fit Air Filter Adapter

Part #Air Filter Perf

Our Price: £

Stock Available:  

14cc OEM Cylinder Head

14cc OEM Cylinder Head

Part #OEM-12210-Z0T-800

Our Price: £

Stock Available:  

14cc OEM Cylinder Head Skimmed 0.065"

Coming Soon

14cc OEM Cylinder Head Skimmed

Part #OEM-12210-Z0T-801

Our Price: £

Stock Available:  

14cc OEM Cylinder Head Skimmed 0.065" and  28.5mm Inlet Valve

Coming Soon

14cc OEM Cylinder Head, Skimmed, Larger Inlet Valve

Part #OEM-12210-Z0T-802

Our Price: £

Stock Available:  

14cc OEM Cylinder Head Skimmed 0.065", 28.5mm Inlet Valve Ported

Special Order Only (allow 2 weeks for delivery)

14cc OEM Cylinder Head, Skimmed, Larger Inlet Valve

Part #OEM-12210-Z0T-802

Our Price: £

Stock Available:  

GX390 Carb

Genuine Honda GX390 Carb.

With its 21mm bore this carb will give you increased horsepower and rpm.  Bolts to Carb adapter.  Use in conjunction with the GX390 Air Filter Adapter.

Part #16100-Z1C-W31

Our Price: £

Stock Available:  

Carb Adapter
(GX390 Engines)

Coming Soon

Honda GX390 Air Filter Adapter

Part #Air_Adpt_GX390

Our Price: £

Stock Available:  

Re-profiled Camshaft #1

Re-profiled Cam Shaft, Custom Ground .265" Lift

Part #CAM_265

Our Price: £

Stock Available:  

This is a .265" lift cam. This cam is designed for use with a standard GX160 or GX200 carburettor. Duration is 226 on the intake and 236 on the exhaust. No block clearance needed for this cam. Just drop in and go! G200 valve springs recommended for use with this cam.  We also recommend fitting a GX140 Emulsion Tube (Part Number 16166-ZE1-005), a 90 Main Jet and a 40 Pilot Jet to help starting.

Re-profiled Camshaft #2

Re-profiled Cam Shaft, Custom Ground .265" Lift, Modified

Part #CAM_265_MOD

Our Price: £

Stock Available:  

This is a .265" lift cam. This cam is designed for use with a standard GX270, GX390 or Mikuni carburettor. Duration is 226 on the intake and 236 on the exhaust. No block clearance needed for this cam. Just drop in and go! G200 valve springs recommended for use with this cam.  We also recommend fitting a GX140 Emulsion Tube (Part Number 16166-ZE1-005), a 90 Main Jet and a 40 Pilot Jet to help starting.

Re-profiled Camshaft #3

coming soon

Re-profiled Camshaft #4

coming soon

Re-profiled Camshaft #5

coming soon

Re-profiled Camshaft #6

coming soon

Re-profiled Camshaft #7

coming soon

Re-profiled Camshaft #8

coming soon

Modified Ali-Flywheel

Modified Aluminium Flywheel
Fins Shortened to Reduce Drag

Part #31110-Z1V-810_mod

Our Price: £

Stock Available:  

#38 Pilot Jet

Genuine Honda Pilot Jet

Part #99204-ZEO-0380

Our Price: £

Stock Available:  

• Tier 2 Flat Top Piston (approx. 152 to 160 Grams)

• Increases the compression ratio when compared to the original dished piston. 

• Requires the Standard Piston Rings (1.45mm)

• Genuine Honda Part

• Tier 3 Flat Top Piston (approx. 158 to 160 Grams).

• Piston is a direct swap to the very popular Honda Tier 2 Flat Top Piston

• increases the compression ratio when compared to the original dished piston.

• Genuine Honda Part that we have then modified.  The original skirt has been shortened by machining to be identical with the Tier 2 Piston skirt.

• Requires the thinner UT1 Piston Rings (0.96 mm) which give you a winning edge by drastically reducing piston ring drag.

Part #13101-ZH8-020-MOD

Our Price: £

Stock Available:  

Genuine Honda GX140 Emulsion Tube

#40 Pilot Jet

Genuine Honda Pilot Jet

Part #99204-ZEO-0400

Our Price: £

Stock Available:  

#90 Main Jet


Genuine Honda Main Jet

Part #99101-ZH8-0900

Our Price: £

Stock Available:  

Part #19511-ZE0-000

Our Price: £

Stock Available:  

Exhaust Kit

Build your own exhaust with our exhaust Kit. The kit includes pre-bent tube, muffler flange and muffler.  Tubing is 19" in length, 1" OD and 1/16" wall thickness. Tubing has a 90 degree bend.

Our Price: £

Stock Available:  

Our complete exhausts provide a good level of flow for modified engines. Tubing is 1" OD and 1/16" wall thickness. Tubing has a 90 degree bend.

Our Price: £

Stock Available:  

Our complete exhausts provide a good level of flow for modified engines. Tubing is 1" OD and 1/16" wall thickness. Tubing has a 90 degree bend.  Includes muffler.

Our Price: £

Stock Available:  

Left-hand pipes bend round to point to flywheel side, whilst Right-hand pipes bend round to drive side.

Please email once you have placed your order to indicate which side of the kart your engine sits on and which pipe you require (left/right handed).

Our Price: £

Stock Available:  

Exhaust 90 degree 2-Stage with Muffler

Our complete exhausts provide a good level of flow for modified engines. Tubing is 1" OD and 1/16" wall thickness. Tubing has a C-Type bend.  Includes Muffler.

Left-hand pipes bend round to point to flywheel side, whilst Right-hand pipes bend round to drive side.

Please email once you have placed your order to indicate which side of the kart your engine sits on and which pipe you require (left/right handed).

Our Price: £

Stock Available:  

Build your own exhaust with our bent exhaust tube. Tubing is 19" in length, 1" OD and 1/16" wall thickness. Tubing has a 90 degree bend.

Our Price: £

Stock Available:  

This exhaust flange fits GX160 & GX200 engines. Build your own high flow exhaust using our exhaust flange.

Our Price: £

Stock Available:  

Universal exhaust muffler.  Welding or some other method is required to install. Canister is 5" long (6 1/4" including threaded end) and 2" in diameter. Good flow, low price and great performance.

Our Price: £

Stock Available:  

Exhaust C-Type, 2-Stage

Our complete exhausts provide a good level of flow for modified engines. Tubing is 1" OD and 1/16" wall thickness. Tubing has a C-Type bend.  Includes Muffler.

Left-hand pipes bend round to point to flywheel side, whilst Right-hand pipes bend round to drive side.

Please email once you have placed your order to indicate which side of the kart your engine sits on and which pipe you require (left/right handed).

Our Price: £

Stock Available:  

Exhaust C-Type, 2-Stage with Muffler

Our complete exhausts provide a good level of flow for modified engines. Tubing is 1" OD and 1/16" wall thickness. Tubing has a C-Type bend.  Includes Muffler.

Left-hand pipes bend round to point to flywheel side, whilst Right-hand pipes bend round to drive side.

Please email once you have placed your order to indicate which side of the kart your engine sits on and which pipe you require (left/right handed).

Our Price: £

Stock Available:  

The Mikuni Jet Kit includes one each of the following jets:-

Main Jets:- 110, 115, 120, 125, 130 & 135.

Pilot Jets:- 10.0, 12.5 & 17.5.

Our Price: £

Stock Available:  

Click Here for Individual Mikuni Main Jets