Description
This Mikuni TM42 Pumper single carburetor conversion kit is for fitment to Yamaha XTZ 660 models.
The TM42 Pumper has proven itself to be our most spectacular upgrade on all brands in the 600cc and larger big thumper market, with very impressive performance gains on the 660 and all Yamaha 600’s. Wide open throttle runs with both one filter box side cover off and back on will determine if you have sufficient air flow without the need for drilling extra holes. A run with the element in/out confirms sufficient filter area and air flow without having to upgrade the element. This same process also determines the best suited of the supplied main jet options, fastest clocked at wide open throttle is the best.
The kit includes: a Mikuni TM42-6 carb, a PA11 carbon fibre nylon printed two into one manifold with mounting hardware and gaskets, heavy duty rubber engine mounting sleeve with clamps, a 1/4 turn quick action throttle and a nylon lined push/pull cable set, a 310mm long choke cable with universal mounting bracket, a custom air-box adapter which bolts to the air-box face using sealant and connects to the carb with a silicon hose and supplied clamps, a plate and spacers for mounting the coil 80mm either further forward on some bikes to clear space for the throttle mechanism, where on others simply using the supplied spacers in the OEM coil location can work. A smaller needle and seat assembly has been fitted to avoid fuel pump pressure pop-off and there are spare jets provided for fine tuning.
Special fitment notes- After first check if simply fitting the two supplied spacers behind your coil allows for clearance with the new carb, if not you’ll have to use of the supplied coil relocation bracket and the spacers for carb clearance, you will then have to purchase elsewhere a 50mm longer spark plug lead. Air-box connection- Due to slight variations in the location of the two outlet port holes in the air box, the removal of some poly material may be required to allow the protruding ports on the adapter to fit into the air box and then also align perfectly with the carb’s inlet spigot. Once checked and aligned mark and drill the fixing bolt holes in the air box. At this time also hold the supplied silicon hose along side the two connecting surfaces to confirm it’s not to long and requiring shortening. On test bikes we have found up to 4mm variations in the gap between the air box adapter and carb face when both are fixed in place so have supplied what is so far a silicon pipe cut to length for the extreme. The air box is then after bolting the adapter in place using fuel resistance silicon sealant to seal all possible air entry points, again slid forward into place, this time with the silicon hose and clamps in place on the carb spigot.
Climate, altitude and fuel density from different octane fuels all have varying effects on final fine tuning as does cam, exhaust and cylinder head porting etc. For this reason, we have included what we have found to be a range of jets to allow you to tune to most variables worldwide.
You will instantly experience exceptional throttle response, acceleration and performance.
IF NOT WANTING TO PURCHASE THE KIT IN ITS ADVERTISED FORM PLEASE FOLLOW THE DIRECTIONS BELOW.
If wishing to modify or use your existing cables, where be advised that most OEM throttles struggle to fully open the TM42, or use your own mounting arrangement to suit the Mikuni TM42, you can purchase the carburetor, tuner jet kit and or what ever other components you want individually by following the directions below.
On the main menu to the left of the page, hover over the carb listing for TM Flatslide Pumper Carbs and then select TM42 carb from the drop down list. When clicking on any individual size Mikuni carb from the drop down list it will put you into a page showing not only the Mikuni carb itself but also any items relevant to that carb, being Mikuni jets, Mikuni flanges, Mikuni carb tuner kits, Mikuni cables , Mikuni throttles, Mikuni air-cleaners and a range of Mikuni carb to OEM air box adaptors etc to also suit. This also makes alternate jet selection easy for you if you have your own spec as only the type jets for that particular carb are shown.
Click on the carb itself if wanting to view the full details and or to make your purchase. Then back arrow back in the carbs main page and go into the tuner kits, which show in the sales drop down list the jetting kits we have for confirmed suitable engines for that particular carb. Again thoroughly read the tuner kit description.
If you’re comfortable with making a purchase of the carb, tuner kit any or other associated components, order it on line or otherwise please call us to further discuss your needs on 0747712677.
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 make contact with using the provided tracking number.
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.
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