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FMF Racing Snap Reviews

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   1 of 1 member found this review helpful 1 / 1 member

Edited: 11/13/2013

The FMF snap is designed to provide more direct air flow into the throttle body. As FMF states, with improved air flow to the throttle valve, you will experience crisper and immediate throttle response, as well as a boost in the low to mid-range torque. The Snap does this by channeling the airflow into four quadrants, allowing the previously swirling air to be channeled more directly into the carburetor. Theoretically the snap makes sense, but there are quite a few people who think that it’s just a joke. But is it?

The test vehicle for this review is a 2006 Suzuki DRZ400S. The bike has had the 3x3 air box mod done, has an aftermarket exhaust (stock header), and is properly jetted for sea level. I am 38 years old, commute to work on my bike, but ride hard off road as well. I ride everything from the city streets to tight single track and woods riding.

The FMF Snap came with clear and precise directions for installation. On the outside of the box, it states that in most cases, it is as easy to install as an air filter. However, with my DR-Z400S, it was not most cases and far more involved. It was not hard by any means, and anyone with a little mechanical ability and the ability to follow directions can easily put their FMF Snap in.

I was previously running 15/47 gearing, which provided more torque than stock, but switched back to the 15/44 stock gearing a few weeks before I received my Snap. This provided me with the opportunity to compare the Snap to the non-stock 15/47 gearing. The testing areas included the streets and highways in and around Wilmington, NC, as well as dirt roads, gravel roads, and tightly wooded trails. The couple of weeks leading up to the install of the Snap, I paid close attention to how my bike felt in the stated environments, so that I would be able to compare the feeling of it with and without the Snap installed.

At my first take off, I was able to feel an immediate increase in throttle response and it was a smooth feeling. It most definitely increased the torque in the low end to mid-range. On the streets, it provided a much needed boost to get out of sticky situations or to get around a car quickly if needed. Off road, the Snap made my bike react the same way. It was fun coming out of turns, while riding fast and technically through the woods and on more open dirt roads.

Something that I didn't like about the 15/47 gearing was that my bike was ringing and revving more than I would like it to while I was commuting. Going back to stock gearing gave my bike the ability to cruise at a higher speed without revving so much. I like the feeling of the FMF Snap with stock gearing more than I like the 15/47 gearing that I was previously running. In my opinion, it provided all the torque of the 15/47 gearing, but without doing anything negative to the top end or changing when I needed to shift gears. The Snap doesn't provide much if anything at wide open throttle, but it does provides everything FMF claims it will where you need it most. In all situations, I give the FMF Snap a big thumbs up and I recommend it to anyone looking to get a crisper throttle response, as well as low to mid-range torque!

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Sgt Spainhour


Instead back in June. Does the job. Especially under half throttle. I noticed for various cruzing speeds, I don't need as much throttle as before. And in small increments is more smooth and crisp. Other wise it's still the same Manukie carb. A little better fuel economy during my regular rides to work. Took a bit of time to get the horizontal plane of the snap square with the carb slide. It's worth the money. I don't know how it may work with the future FCR carb upgrade. I went on a ride Saturday for 100miles one way and down to the foot of the mountain and got 62.5mpg. Then 50mpg on the way back up. About 10mpg better on the up to 10% ethanol 93 octane gas available everywhere unfortunately. And about the same with ethanol free gas but lower octane. Hard to find station with higher. But the point is it's worth it. Two big thumbs with all the stars.

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makes a light whistle noise but feels good

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I was speculative about the FMF snap but after reading in a prominent dirt motorcycle magazine that it was particularly effective on motorcycles that use CV carbs I ordered one for my DRZ-400S.

Installation was more difficult than I had expected as the snap is meant to be inserted into the air boot from the carb side on the DRZ.  FMF suggested raising the subframe to do this.  I did the install this way and got it in.  In hindsight it may have been easier to pull the carb.

The FMF snap is meant to give more laminar air flow into the carb, improving throttle response and boosting low rpm torque.  It does this and it is very noticeable.  The bike is much smoother and very controlled at low engine speeds.  This is one of the best mods I have made to the bike and the first place to start with engine performance mods for any CV carb'd motorcycle.  Despite the difficult installation, I am quite happy with the FMF snap.

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Old Plonker


 When I bought my CRF150RB I intended from the beginning to make it into a lighter and more performant version of what KTM was aiming at with their 350 Freeride.

The biggest problem I ran into was the nature of the powerband, characteristic of highly-tuned small engines with big carbs. Its torque curve is as flat as a mesa from 6,000-12,000 rpm, but from idle to 5,000 rpm it is weak and then suddenly surges into the powerband with an almost uncontrollable rush (not great for negotiating tight, uphill mountain switchbacks.) 

There have been many threads on converting this bike to a trail bike, and of the many mods, the most popular are 1) Rekluse clutch; 2) heavier flywheel; 3) big-bore kit; 4) torque-grind cam, and; 5) lower gearing. But the real problem remains: poor throttle response off idle, then a very sudden surge to full torque. These mods only partially mitigate the problem.

Because the bike is also extremely sensitive to pilot jetting, I theorized that the problem was due to poor flow velocity over the jets until the engine came on the cam. The Snap is designed to increase flow at small throttle openings by reducing turbulence at the base of the slide.

So I took a chance and installed the Snap. The first sign that I had made the right choice was when the bike fired on the first half-hearted kick (it usually took three or four strong kicks when cold.) After a short warm-up, I kicked it into gear and motored away smoothly and cleanly with great throttle response and clean power modulation. You could spend $1,500 on mods 1-4 above, and not get as good results as the Snap gives. So, is it worth the money? If it had been the first mod I did, I would have saved a lot of money and time.

I can't imagine that it would make this kind of difference on an injected 450, or even a 250, but for my application it has been outstanding.

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