There is very little in the Honda service manual regarding the accelerator pump circuit, or leak jet, so I documented the process that I used to solve this problem, and decided to share. ![]() After the head was rebuilt, and the engine freshened up with a new piston and rings, the lean bog was still there. I recently had the pleasure of performing a complete frame down rebuild on a 2007 CRF250R that came to me with an intolerable bog issue when the throttle was stabbed from idle or low RPM (both when riding, and on the stand). Warning: CRS should be operated by push-pull cable.Sold with racing velocity stacks but can be used with air cleaners.Easy jetting which can be done at track side.Easy installations with kits available for single, twin, and four cylinder motorcycles.In addition to performance, CRS carburetors are easy to tune because all jetting parts are available. CR carburetors are designed to offer a performance increase over stock production carburetors and have proven this by many Super Bike wins. Keihin CR Special 39mm Carburetor Kit for Honda CB 900 PRE-JETTED AND COMPMLETE WITH INTAKE SPIGOTS AND VELOCITY STACKS Legendary carburetors for the high performance motorcycle world. Turning IDLE MIXTURE SCREW (CR, PWK, PJ, PE). The following is a guideline for jetting Keihin carburetors.
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