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U.F.O.
(Ultimate Flow Optimizer)
PATENTED

UFO Ultimate Flow Optimizer for Mikuni Round Slide Carburetor
Triple kit with Drill Guide
 

Get ready for throttle response you never knew existed!
SnowTech Magazine

The UFO is a simple, trouble free, aerodynamic piece that fits VM Mikuni carburetors from 30 mm through 44 mm. The UFO makes a normal round slide carburetor out-perform the more expensive flat slide carburetor by eliminating turbulence and increasing air flow and velocity, creating a highly atomized fuel charge. Normal gains are 3/4 to 1 HP per 100 cc of engine displacement on 4 stroke engines and 1 1/2 to 2 HP per 100cc of engine displacement on 2 stroke engines. (Minimal rejetting and tuning are required).
 

* More horsepower with less fuel
* Broader power band
* Explosive throttle response
* Superior fuel atomization
* Less sensitive to temperature, altitude and jetting changes
* Cleaner emissions
* Cooler running engine
* Easier starting and warm-ups
* Eliminates cold pipe syndrome
* Works great with stock or modified engines
 

Air Bleed Tuning Information

U.F.O. Air / Fuel Flow Diagram

Standard round slide Mikuni carburetor flow

Without the U.F.O., the air hits the forward wall of the slide cavity creating a rolling air turbulence which forces the poorly atomized fuel droplets to the lower portion of the carb bore resulting in poor fuel atomization and poor performance.

 

UFO Mikuni Round Slide Carburetor flow

With the aerodynamic U.F.O. filling the slide cavity, the rolling air turbulence is eliminated.  The higher velocity air flow pulls the fuel further up the needle and higher in the carburetor bore resulting in superior fuel atomization.  This means more HP, quicker throttle response, improved fuel economy and a cooler running engine.


Gain up to 7hp on your Banshee

Install UFO's on your Banshee and gain 5.25hp to 7hp.  The maximum gains will be in low end and midrange with modest gains on top end.  This is the biggest bang for the buck (5.25hp gain on stock Banshee and more on a modified Banshee).

Only $35.00 per carburetor.

** See below for Pilot Jet information!!

2628 - Yamaha Banshee carbs and (slide ID 24mm) 

   

3234 - Most 30 mm and all 32 through 34 mm carbs (slide ID 32.2mm) ** 

   
3600 - 36 mm carbs with slide ID of 35mm (Ski-Doo snowmobile and many motorcycle) **
   
3638 - 36mm carbs with slide ID of 36mm and ALL 38mm carbs **
   
4044 - 40 through 44 mm carbs **
   

The Majority of all applications require a 3.5 UFO Cut-away piece.
This is what is included in all kits as ordered.

**When installing UFOs, the pilot jet must be reduced substantially (usually about 50%, sometimes even more).  Most installations end up with a 3.5 UFO and a #17.5 or #20 pilot jet.  These sizes are usually difficult to find locally.  Thunder Products has all sizes in stock for $4.00 each.  List your vehicle make, model and modifications in the special instruction box and we can give you a suggested size based upon our experience.  Or if you know what size you want, list that in the special instruction box and add the number of jets needed to your cart.

Pilot Jets

 

Idle Screw - Extra long idle screw for 40-44mm VM round slide Carburetors UFO extra long Idle Screw 40 42 44 Mikuni roundslide carburetor

 

 

 

UFO and Dial-A-Jet

We are frequently asked how or if the UFO works with a Dial-A-Jet.  The answer is they work great together.  When a UFO and Dial-A-Jet are used on the same carburetor you have a very high tech carburetor at a reasonable price.  Due to the carburetor's newfound ability to atomize fuel more efficiently, your engine can produce maximum horsepower and torque under all conditions without changing jets.  The chart will show you where each product is most effective.  As you can see by the chart, they compliment each other.

 

What about clutching your snowmobile?

Do you have to change your clutch after installing UFOs?  NO!  Should you change clutching?  YES!   Clutching is simply a matter of having your transmission follow the power curve of your engine.  Therefore it should be easy to understand that any changes in the power output of your engine must be followed by a corresponding change in clutch calibration.  Without making this change, the power does not get to the track or ground.  These graphs will show you how the power is effected by UFOs and how to get the power to the ground. 

The chart below shows a properly calibrated shift curve, holding a constant RPM from low end through midrange and top end.

 

 

The chart below shows a shift curve that has been altered by added HP produced by the UFO.  Your clutching should be adjusted to get the additional horsepower to the ground.

 

 

As shown in the graph, your clutching needs to be adjusted in low and midrange only.  THUNDERSHIFT or HEAVY HITTER Kits make this easy to do.  With Thunder Shift/Heavy Hitter you can adjust low range, midrange and top end independently - no other method gives you these options.  It's inexpensive, it's easy, it's accurate!  By adjusting the clutch to run the proper RPM you transfer the power to the track giving you a big boost in performance.

 

 


THUNDER PRODUCTS, INC.

21676 Deep Lake Road
Richmond, MN  56368
Phone - 320-597-2700
Fax - 320-300-4830

Summer business hours:  Mon through Thurs 9am - 5pm, Fri 9am - 12:00pm CDT
Saturday by chance only.  Closed Sundays.

Technical questions can be answered by telephone only during regular business hours.
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