We also stock "easy-adjust" Kouba Fuel Screws to fit factory - installed Keihin "FCR" carburetors.  If you have tried to adjust the air/fuel mixture screw on your FCR carburetor, you know one of these is a must!  These Kouba fuel screws make it easy to adjust your air/fuel mixture screw. The K-FS1 fuel screw will fit:  KTM RFS 250/400/450/520/525 , Yamaha YZF/WR 250/400/426/450, Honda CRF250/450, or Suzuki DRZ400E or other bikes with factory-installed Keihin FCR carburetors. (aftermarket FCR carburetors use a different thread pitch - do not use this fuel screw!) Kouba Fuel Screw

TO PURCHASE:  Put a quantity in the box, then click the "Add to Order" button or call PWCCost.com at 1-888-284-4588. PowerNow System - 4-Stroke Applications Cost Qty PNSRK2Z PowerNow System - fits Kawasaki KX 250F 2004-08 - includes PNRK2Z PowerNow and PNPRKY2 PowerNow Plus $179.99 PNSH4 PowerNow System - fits Kawasaki KX 450F 2006-08 - includes PNH4 PowerNow and PNPH/S4 PowerNow Plus $179.99 PNSS4 PowerNow System - fits Kawasaki KLX 450 2007-08 - includes PNS4 PowerNow and PNPH/S4 PowerNow Plus $179.99 PowerNow - 4-Stroke Applications Cost Qty PNS4 PowerNow - fits Kawasaki KLX 450 2007-08 $91.99 PNH4 PowerNow - fits Kawasaki KX 450F 2006-08 $91.99 PNRK2Z PowerNow - fits Kawasaki KX 250F 2004-08 $91.99 PNY4 PowerNow - fits Kawasaki KLX 400 1998-2002 $91.99 PowerNow Plus - 4-Stroke Applications Cost Qty PNPRKY2 PowerNow Plus - fits Kawasaki KX 250F 2003-08 $91.99 PNPH/S4 PowerNow Plus - fits Kawasaki KX 450F 2006-08 $91.99 Kouba Fuel Screws Cost Qty K-FS1 Kouba replacement fuel screw - fits factory installed Keihin FCR carburetors (aftermarket FCR carburetors use a different thread pitch) $19.99 Availability Guide: = Normally ships the same business day  = Ships in 1 to 2 business days  = On backorder from the manufacturer If you order an item that is on backorder, we will not charge your card until the order is ready to ship.