Please Note: The pictures above are of the TM38-18 and are for a reference purpose only.

The TM38-27 is supplied with the following factory jetting installed:

Pilot jet 20 (VM22/210),  Needle 6EJ12-55 (richer and leaner available),  Needle Jet (Fixed in place),  Main Jet 370 (4/042),  Slide  3.5 (999-832-014)

Dimension A= 44mm, B= 76mm, C= 164mm, D= 62mm, Total Width= 76mm

Unlike many motorcycle manufacturers’ purpose built and modified pollution compliant versions of the TMX carb, these factory TMX flatslide racing carbs are regarded by the factory to be the best performing version of this carburetor ever made.

The TMX features a flat slide design in a smooth bore venturi to provide improved throttle response and wider powerband. The float system with independently moving floats, working with a main jet enclosed in a baffle chamber, allows the TMX to perform smoothly without hesitation on the roughest terrain. These carbs are jetted to suit virtually anything from later model 125cc high performance motocross engines, all 250cc reed valve motors and also all of the larger two stroke engines which perform great with often never a jet change. If fitting to a piston port engine, they do require a drastic jetting down size.  Once fitted it will eliminate a lot of the hesitation, hard starting and other performance problems experienced with some OEM carbs and best of all will boost performance..

It is always advised to buy a spare one size up (380) and one size down (360) main jet so as to positively verify your correct fuel mixture and optimum power at WOT. When replacing carbs with throttle position sensors and other such electrical items fitted you will need to determine if these do not need to be connected before purchasing and installing one of our carbs.

If your carb measures around 12mm, 20mm or 40mm longer than the 76mm front to back measurement of the TMX carb, and if intending to still use the standard air-box you will need to purchase separately from our TMX Carbs page the corresponding silver anodized extender. When ordering an extender with your carb please advise in the order comments section if you want us to press fit it to your carb with Loctite before delivery. The two shorter extenders have an outside diameter of 60mm at the air-box end which is slightly smaller than the carb itself and the 40mm long one is 62mm diameter.

The picture above with the cable shows the required length of inner cable protrusion and securing fitting required at the carb end at basically a minimum length adjustment. The back board is divided into 1 and 10mm increments. If your inner cable is to short you may consider one of our Quick Action throttle and cable assemblies.

IMPORTANT TUNING CHARACTERISTICS

The jets in this carb are spot on for most motorcycles with a few requiring a main jet changed as suggested above and once fitted and checking the pilot setting, occasionally some motors may ask for a one or two size leaner pilot where Husky’s often like a 25. The needles only ever may need a change when fitted to some multi cylinder applications. Follow the tuning sheets supplied with the carb and if requiring a change, the perfect tune is easily achieved.

The Jet Needle is the tapered rod that is positioned in the throttle valve by the ‘E’-Clip. The taper of the needle increases the clearance between the Jet Needle and the fixed Needle Jet outlet as the throttle is opened. As the air flow volume increases past the throttle slide, the fuel volume is also increased to maintain the correct air/fuel ratio.

NEEDLE ‘E’-CLIP POSITION

The position of the ‘E’-Clip in the Jet Needle is used to correct or change the air/fuel ratio between 1/4th and 3/4th throttle valve position. The ‘E’-Clip can be raised or lowered on the Jet Needle. To richen the fuel mixture the ‘E’-Clip is lowered on the Jet Needle, raising the Jet Needle. To lean the fuel mixture the ‘E’-Clip is raised on the Jet Needle.

JET NEEDLES

To correct the fuel mixture at 1/8th to 1/4th throttle slide position it may be necessary to change the Jet Needle. The Jet Needle will have a series of numbers stamped on it.

Example: 6EJ 12-55. The numbers 55 indicate that the outside diameter (O.D.) of the Jet Needle is 2.55mm. A smaller O.D. number gives a richer mixture. A larger O.D. number gives a leaner mixture. Typical Jet Needles available.

Additional Information:

Please Note: Other than exact replacement OEM carburetors, all Mikuni Aftermarket Carburetors and Tuning Components are sold “As Is” for Off Road / Racing Use Only and are not intended or approved for use on vehicles operated on Public Roads or in locations where applicable engine tampering and anti-pollution laws apply.

 Australian Shipping Information:

All shipping within Australia is via Australia Post only.

Please note that we are located at Townsville North QLD and that all standard shipping “Free Freight” travels by train from us all the way down the East Coast as far as Victoria. EBay freight times are estimates only and do not take in to account our location. We have express options available for all our products also. The freight times around Australia are as follows-

Standard or eBay “Free Freight”

Townsville to Brisbane 3 days, Townsville to North/Just South and West is usually 1-2 days,

NSW ACT & VIC 4-6 days, TAS & SA 4-8 days, WA & NT 8-12 days.

Express Freight

Anywhere in QLD except some rural areas is next day delivery. NSW ACT & VIC 2 days, TAS & SA 2-3 days, WA & NT 3-4 days.

Please note that weather events such as flooding, cyclones and other natural disasters etc will delay any ground freight. This is entirely out of our control if this occurs.

 International Shipping Information:

All international shipping is done through Australia Post Express Courier EMS service.

The international service we use is generally 4-5 Business days for delivery but can be shorter or longer.

 All international buyers are responsible for the payment of their domestic customs duties and taxes charged on imported goods. The duty-free threshold and duty/taxes payable rates differ from one country to another and we strongly advise you check your liability before ordering if unsure. Please check your tracking on all international shipments within 7 days to follow their progress and determine if it is being held by your local customs dept. or on their behalf by the Postal Service, who you will need to contact using the provided tracking number.

 As per the eBay terms and conditions, WE ARE NOT RESPONSIBLE AS A SELLER FOR YOUR COUNTRIES IMPORT DUTIES OR TAXES, WE HAVE NOT NOR WILL WE EVER PAY YOUR IMPORT DUTIES OR TAXES, OR REFUND ANYONE FOR THEM AND THEY ARE DEFINITELY NOT INCLUDED IN THE ITEM PRICE! PLEASE CHECK YOUR COSTS BEFORE MAKING THE PURCHASE! THIS IS JUST PLAIN OLD COMMON SENSE.

 Please also note that international parcels HAVE to be signed for and all parcels whether domestic or international are fully insured.

 Returns and Refunds:

Our business Warranty or Return period is 7 days only. We do accept eBay’s 30 day return policy but please read all the information below carefully before making your purchase.

THE FOLLOWING INFORMATION IS FINAL.

Here at Mikuni OZ we do offer refunds and returns but there are strict procedures for this.

All carburettor kits that need to be returned for refund or exchange MUST be returned in the exact same way they left the warehouse. All Carburetors & Carby kits that have been opened WILL BE thoroughly stripped and inspected, in the case of any fuel being added, greases or lubricants, tampering or any form of damage to the carburettor there will be ABSOLUTELY NO refund and the kit will be returned to you at your expense! THIS IS FINAL AND NO OTHER EXCEPTIONS!

Absolutely all returns for any reason will be charged a 10% restocking fee whether it has been opened or not before it was returned and the freight for us to send you the kit originally will be deducted also before your refund is issued.