- Description
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Details
Includes one slide, and one UFO disc kit.
Here we have a brand new, Genuine Mikuni slide which we have milled and drilled for ease of installation when running the 30-34mm Thunder Products UFO discs. We start with a brand new slide installed into our custom jig, and cut it down to exactly the correct cut-away for use with the UFO. After that we drill the mounting hole, and then a counter sink so you can be sure that the UFO disc is properly aligned and secured. If you have ever personally setup up a slide for use with a UFO, we think you will agree that it is not as straight forward as most would think to get it right.
When we started using the UFO discs in our carburetor kits, we knew we could not rely on the include "tool" for drilling the slides. It just does not work properly. Some might think its good enough, but if you don't get it perfect, whats the point of using a UFO at all? If you try to drill your slide, and you don't get it right, you don't really get a second chance. Slides aren't cheap. Save yourself the hassle, and get one that is ready to go for VM30-VM34 left side idle Mikuni carburetors.
The UFO by Thunder Products is a simple, trouble free, aerodynamic piece that fits VM Mikuni carburetors. 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. (Re-jetting and tuning may be 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
- Reduces cold pipe syndrome
- Works with stock or modified engines
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.
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.
NOTE: When installing UFOs, the pilot jet must be reduced substantially (usually about 50%, sometimes even more).
Additional Information
Specification Details Jet Type Slide Slide Type VM34/110 Slide Cutaway 3.5 Slide Plating Chrome Brand Genuine Mikuni SKU VM34/110-UFOKIT Country of Manufacture Japan Fitment Information
Mikuni Models
- Mikuni VM30-83 Round Slide
- Mikuni VM32-33 Round Slide
- Mikuni VM34-168 Round Slide
Questions & Answers
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What are the advantages of going with your kit instead of just buying the UFO and installing it myself for half the price?
Our kit includes everything needed for quick and painless installation of a UFO into your carb. You do not have to run the risk of modifying your existing slide improperly, and ruining it. In order for a UFO to function properly, the cut away of the slide needs to perfectly match the ramp of the UFO disc. We CNC our UFO kit slides so that the cut away is perfect, and the mounting hole is exactly where it needs to be for proper alignment.
1. No risk of ruining your slide and having to spend more money, just to try again
2. No headaches or time spent attempting to modify your existing slide correctly
3. You can retain your slide for future useAnswer by: Web Support (Admin) on Nov 23, 2015 5:07:00 PM -
Do you have the hardware that fits on the top of the slide to hold the throttle cable and retain the needle?
In general the cable is slid into the slide, and does not require hardware to retain it. The needle retainer can be found at this link: http://www.nichecycle.com/ncs/categories/carburetor/replacement-parts/vm34-31-plate-needle-retainer-by-mikuni.html
If you are working with an OEM carb that has some sort of hardware to attach the cable, please send us a photo.Answer by: Web Support (Admin) on Dec 29, 2020 10:58:00 AM -
I am looking for a left & right slide with UFO kit installed for a VM34. Will this fit the left side and the other sku you list fit the right side? Is there more info than just VM34 needed to assure fit?
Correct. This will fit the left side, and the other one you are seeing will fit the right. There is no other information needed. The two skus are VM32/65-UFOKIT and VM34/110-UFOKIT
Answer by: Web Support (Admin) on Jan 10, 2022 3:42:00 PM -
My VM34 has a 2.5 cutaway throttle valve. Which cutaway is this based on? Or does it no longer make a difference?
In order to properly use a UFO, the slide will need to have an equivalent cutaway of about 3.5. Our kit includes a custom cut slide, to perfectly match the UFO insert. The size of the cutaway is no longer relevant when using a UFO.
Answer by: Web Support (Admin) on Feb 23, 2021 10:26:00 AM
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- Fitment Information
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Fitment Information
Mikuni Models
- Mikuni VM30-83 Round Slide
- Mikuni VM32-33 Round Slide
- Mikuni VM34-168 Round Slide
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