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2012 Honda CBR250R/RA Valve Adjustment Procedure - Page 1
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Disclaimer: this is not intended as a replacement for the Honda service manual for this motorcycle. The author and website owner are not responsible for any errors or incorrect procedures or advice in this document. By using this document and following the procedures and advice below, the user assumes all risk and responsibility for injury or damage to their motorcycle. The author is not a motorcycle mechanic and has received no formal training in motorcycle servicing. Consult the service manual for additional information.

Read all of the instructions before beginning. If you have a digital camera, it may be helpful to take some photos of the bike as you remove parts and reposition others, so that you can refer to them later as you put the bike back together. The following is based on the author’s observations and experience performing a valve clearance adjustment on the 2012 CBR250RA and on information contained in the official Honda service manual for the 2011 CBR250R/RA (part no. 61KYJ00) which the publisher has stated is also applicable to the 2012 model year.

The service manual skips over a few points that would be helpful to know in advance. This document attempts to fill in some gaps, help clarify some points and offer some hints to make the valve adjustment procedure a little easier. The actual valve clearance inspection and adjustment procedure should also be applicable to the 2013 Honda CRF250L as both models essentially use the same engine (with a few differences). The specified valve clearances are likely the same, but you should still consult the CRF250L service manual to verify that as well as other aspects specific to the CRF250L.

Some people say it’s easier to perform the valve adjustment if you remove the fuel tank. It probably would make the job easier if the fuel tank was out of the way, but I’ve also heard that it can be difficult to disconnect the fuel line from the fuel pump; the quick connectors are apparently not so easy to disconnect. There are also a number of wires, cables, tubes, connectors, the frame tubes and other parts that impede access to the valves. Anyway, you can check and adjust the valve clearance without removing the fuel tank; that’s the way I did it, but the access and visibility is somewhat limited.

By performing the valve clearance check and possibly valve clearance adjustments yourself, you can save a significant amount of money, learn more about your bike and gain the satisfaction of maintaining your bike yourself. The most frustrating thing about this procedure on the CBR250R is the limited amount of access or working room. There is nothing technically challenging about the procedure though, especially since the camshafts do not need to be removed in order to replace valve shims. Use the correct tools for the job.

Note: with 1033 km on the CBR250R in the photos, both exhaust valve clearances (0.19 and 0.20) were less than the specified range and needed adjustment, but the intake valve clearances (0.17 and 0.17) were fine.

Parts and supplies you may need:
  • valve shims
  • valve cover rubber gasket
  • copper sealing washers for the bolts securing the rocker arm shafts
  • silicone liquid gasket / sealant (Three Bond 1207B, 1215, etc.); available as a Suzuki part from a Suzuki dealer
  • valve cover bolt seals
  • motorcycle engine oil that you currently use for your bike
  • shop towels
  • electrical tape

Tools you may need:
  • torque wrench
  • tool to remove the crankshaft hole cap and timing hole cap (ex. Motion Pro timing plug wrench)
  • telescoping mirror
  • telescoping magnet
  • 10 mm, 12 mm and 17 mm (?) sockets, 6 inch extension and ratchet
  • 5 mm and 6 mm hex keys (Allen keys / wrenches)
  • feeler gauges, preferably angled and tapered (or narrow) to measure the valve clearances
  • micrometer to measure shim thickness
  • flat bladed tweezers
  • small flat bladed screw driver
  • needle nose pliers
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