I purchased a 14F4 almost a year ago and paired it with an Adams flugelhorn. It didn't work well with that particular horn. I ended up selling both. Fast forward to two days ago. I bought a brand new Yamaha 8315G, which came supplied with a 14F4. The experience was much different. The mouthpiece and the horn are a perfect combination.

I purchased an inexpensive flugelhorn just to have in case the unexpected happen to a 4th trumpeter. The stock mouthpiece was too uncomfortable to play (very sharp feeling with outer edge, difficult to center, for example). The Yamaha 14F4 had good reviews from non-flugel professionals that influenced my purchase. Yes, even for my chops, this was the right decision as the mouthpiece feels very natural and comfortable.

For half the price as Schilke sized nouth piece this is fine for me on my
Schilke 1040f flugelhorn (doesn't cone with mouthpiece? Why Schikke I know it seems wasteful but just put one on that uses your preferred leadpipe matching your size leadpipe as two leadpipes is generous but then no mouthpiece seems oddly stingy (maybe it's me?) lol
"”- don't hesitate to buy this yamaha flugelhorn mouthpiece __if you have__ the proper matching size leadpipe which in my
horn kit is one with the L (other has and S on it) . If S stands for Schilke then it's news to me as don't yet own a Schilke flugelhorn mouthpiece so don't use my review to assume Yamaha is better just that it plays fine with the Lesdpipe they include both sizes with Schikke 1040f but was used to Yamaha 11F4 standard flugelhorn
mouthpiece so saw no reason to pay double for same size mouthpiece unless it's gold or silver and pretty sure the one that's over 100 isn't either so price is right!

I purchased this mouthpiece to use with my Yamaha Flugelhorn. It has the correct shank size and the 14F4 is the closest dimension size as I could get to the Bach 3c mouthpiece i use for my trumpets. I find it familiar to play on. It kind of reminds me of my Schilke 15 mouthpiece (which I find very comfortable and easy to play). Highly recommended to anyone who needs a Yamaha shank Flugelhorn mouthpiece.

Quality mouthpiece, nothing wrong except it doesn't fit me.

Had trouble finding notes with it. Might be on the large size compared to my trumpet mouthpiece, too much of a jump. Switched to a Wicks 4B and had a lot more success.

But that's nothing wrong with this mouthpiece if it is the right fit for you. Everyone is different. Check the specs, pic an interior rim closer to your other mouthpieces and give it a whirl.