Description
This Mikuni TM42 Pumper single carburetor conversion kit is for fitment to Yamaha SZR 660 models when wanting to use the OEM air-box, due to the position of the TM42 carbs RH side cable connection bracket which interferes with the OEM air-box, we have this alternate kit with a custom made and fitted LH side throttle assembly for use with the OEM air-box. Alternately we list the std TM42 carb as a kit for using a POD filter which needs to be mounted overhead where there is a lot of space once the air-box is removed. To successfully plumb in this new arrangement you need to buy elsewhere, either a solid U bend or flexible reinforced type vacuum pipe to mount on the TM42’s 65mm spigot (2 1/2″ usually OK) for doing a U turn back up and over the carb, then connecting to an as large as possible POD. The POD should be firmly held in place by means other than just the connection to the carb.
This kit is also available in the budget priced TM38 option, also for use without the air-box, or for using the OEM air-box there’s our TM40 or the forementioned 42 standard TM42 for using with a POD filter. See these kits as separate listings along with options for other 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 all Yamaha 600’s. Due to air-box space restrictions overhead this carb isn’t the easiest fit up option for your SZR 660, but well worth the effort. Wide open throttle runs with both your filter on and off will determine if you have sufficient filter area to supply this carbs demand. This same process also determines the best suited of the supplied main jet options. To use of your OEM air box, you will need to fabricate a cover plate to close off the two air-box entries converting it to accept the rivet on the supplied single alloy funnel, as seen in the product picture. This easily connects to the back of the new carb using a purchased elsewhere, matching silicon automotive 2 1/2″ 90 degree elbow. Wide open throttle runs with both your filter box open and closed will determine if you have sufficient air supply and if filter area to supply this carbs demand or id additional holes need to be drilled into the air-box. This same process also determines the best suited of the supplied main jet options.
The kit comes with a custom modified Mikuni TM42-6 carb with lefthand throttle cable attachment, 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 2 1/2″ alloy rivet on alloy funnel for the air-box, a 310mm long choke cable with universal mounting bracket. There are spare jets provided for fine tuning.
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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