Suzuki DR200se
Carburetor extended Long Boy Pilot Fuel Screw 

Long Boy Fuel Screw kit

pn: CRZ-SCR-5020m

 with new spring, washer and o-ring

1. Choose your shipping method


"Long Boy"
Finger adj. extended Fuel Screw

Frustrated with trying to find an "almost 90 degree"  screwdriver to fine adjust your fuel screws for best idle and cruise?
Use Factory Pro's new "finger adjustable" fuel screws to adjust fuel screws for best throttle response. Traveling to high altitude? It's easy to lean out the lowend temporarily.

Make your life easier!

Remove old fuel screw, old o-ring, old washer and old spring. The o-ring might be stuck in the carb, so, take a light and make sure it's really out (if it didn't come out with the screw or you can't find it after you took out the screw)
Use a small bent wire to pull it out if it doesn't drop out. Keep the old parts for "spares".

Fuel screw assembly comes with:
1 Long Boy fuel screw
 1 new o-ring
1 new washer
1 new spring

     Great product, best price around for these and fast shipping! Thanks   Blargins45

     Thanks!  Works great!

David Munro  July 16, 2019
2000 dr200se
"Thanks Marc. Works beautifully."



For the past several months, I've been working with Marc Salvisberg, the wizardly owner of Factory Pro Tuning, to create a finger-adjustable fuel screw for the OEM Mikuni carburetor on the TT-R125. Tonight, my friendly neighborhood UPS man delivered the prototype to me, and I could hardly wait to install it in my TT-R125E.

I'm sure you're like me, and you fiddle with the fuel screw all the time, but it's a major pain to adjust, as I'm sure you know. Well, our days of envying FCR-equipped bike owners with finger-adjustable fuel screws are over.

Marc came up with a "T-handle" fuel screw design that works perfectly. You can install it without removing the carb from the bike, and it's a perfect length--long enough to clear the rather tall fuel bowl on the TTR, but not too long so that it's obstructed by the clutch cable located below the carb. The "T" profile on the end is very easy to index, and its shape is easy to get leverage on with your two index fingers. All in all, it's a big success, and I let Marc know that the design is ready to go to market.

Marc has set a retail price of $XX.95 for the screw (which includes the required spring, washer, and correct-size o-ring), and they are available from his company (Factory Pro Tuning). You can log onto for Marc's contact information.

BTW, I apologize for not including a photo of the screw. I was too excited to install it and try it out to take the time to snap a pic of it. At a later time, I will try to take a shot of it installed in the carb on my bike.

But, for now, get in touch with Marc and Factory Pro and "get you one"!

Sean Bice



I read on Thumpertalk ( )

that you now have an adjustable fuel screw for the Yamaha TTR-125 but can't seem to find it on your website for ordering. 
Can you help me out?
Thank you, Brent McDonald





Absolutely NO carb parts sold in California.

New and improved Suzuki Teka SFI  2

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The extension of the laboratory for engines of the Swiss Federal Institute of Technology was completed in about 1935. Its architect was Rudolf Otto Salvisberg (1882-1940). He had a successful career in Berlin but returned to Switzerland after the advent of the Nazis. His architectural style was somewhat similar to that of Erich Mendelsohn. The staircase of the laboratory is in normal use but well preserved.
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