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Cable

Spare replacement throttle cables for your TM40 carburetor conversion. Fits the stock throttle housing.

These are premium low-friction cables. 

Add Cable Lubricant
Ships same business day
$73.95

Fuel and Intake

Carburetor

Softer return spring for your TM40 carburetor.

This replaces the stock return spring that comes with the TM40 carburetor creating a 25% lighter throttle feel.

Ships same business day
$12.95

Want an amazing increase in throttle response? More power over a much wider range? The Mikuni TM40 does all of that plus runs smoother at lower RPMs and pulls taller gearing with ease.

Our complete kit comes with alloy adapter rings bonded to the genuine TM40 carburetor body for a firm reliable fit in the stock air boots. We also include new low friction cables, an extended fuel screw, complete instructions along with a wide range of extra jetting for fine tuning. It even has a vacuum port for the stock fuel petcock.

The carburetor comes pre-jetted for the typical mods: performance pipe and modified air box, or we can set it up for your particular bike before we ship it out.

 Instead of the tough to reach choke knob, all TM40's come with a remote choke and bracket. This makes it easier to reach the knob, especially if you have an oversize tank.

Add Pocket Tuner Tool
Add Lighter Return Spring
Ships same business day
$579.95

Extended float bowl screws from Wirth Machine for your TM40 that use 1/4" size wrench to loosen. Allowing easy access to your jets and float without having to remove the carburetor from the bike. Sold in a 4 pack. Stainless steel threads.

Ships same business day
$15.95

Replacement socket head (Allen) screws in case you strip out the stock JIS heads on your TM40 bowl. The originals can be stripped out when doing any tuning or carburetor maintenance. Sold in a pack of four, all for the bowl.

Ships same business day
$4.95

Jet Kit

Our own jet kit for the Mikuni TM40 carburetor.

Includes new main jets, pilot jets and a new needle with e-clip.

Comes with a printed Mikuni tuning manual and a jetting suggestion chart.

  Not for the stock carburetor Fits TM40 conversions Only

Ships same business day
$79.95

Geared for the do-it-yourselfer that already has a TM40 or HS40. This kit supplies everything you need to convert it for use on your bike.

Kit includes intake and air boot adapters, throttle cables, choke knob, accelerator pump nozzle, a wide selection of main and pilot jets plus a TM40 tuning manual.

Add Pocket Tuner Tool
Ships same business day
$169.95

Carburetor Repair Kit

Has your TM40 carburetor been sitting for too long and now needs to be rebuilt? Then what you need is this TM40 Rebuild Kit that contains Genuine Mikuni replacement parts.

This kit includes:

  • Needle Clip and Washer
  • Top Cover Gasket
  • A/P Nozzle O-Ring, Plug and Rubber Cap
  • Fuel Screw O-Ring, Washer and Spring
  • Float Bowl O-Ring
  • Pilot Fuel Screw
  • Drain Plug O-Ring
  • #3.8 Needle Valve Assembly
  • O-Ring for the Starter Circuit and Needle Valve
  • New Screws for the Float Bowl
  • Vent Hose
Add Pocket Tuner Tool
Ships same business day
$39.95
  • Include top cover gasket, jet needle E-ring and washer, throttle valve seal, pilot air O-ring, fuel joint O-ring, accelerator pump O-ring, needle valve O-ring, needle valve retainer screw, needle valve assembly, float bowl O-ring/gasket, overflow hose, float bowl screws, accelerator pump rod boot
  • Genuine Mikuni parts properly replace worn or mistreated components for the TM42 carburetor
  • Includes all the parts needed to rebuild TM42 carburetor
Ships in 3-5 business days
$44.95