1997-2001 Honda CR250 – Top End Rebuild – Part 8: Exhaust Valve Inspection

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How To Inspect The Exhaust Valve On Your 97-01 Honda CR250

1997 - 2001 Honda CR250 - Top End Service - Part 8 - Exhaust Valve InspectionThe Tools You Will Need

  • Stiff Brush
  • Shop Towels
  • Parts Cleaner
  • Dremel
  • Calipers
  • Emery Paper

Pre-Service Notes

Exhaust Valve Cleaning

The exhaust valve components are in direct contact with exhaust gases, so the carbon build-up will be substantial. If you have the time, soak all the parts overnight in brake cleaner and degreaser.

  1. Scrub every component thoroughly with a soft bristle brush.
  2. If your valve components are as bad as mine, you can use a steel brush on a drill for the big stuff, followed by a light sanding with a Dremel.
  3. However, to avoid gouging or uneven surfaces, I will need to follow the Dremel with a fine-grit sandpaper.
  4. Visually inspect every part for apparent signs of uneven wear or damage.
  5. Inspect the valve bearings for smooth operation.  If they snag or feel rough, they need to be replaced.
Scrub every component thoroughly with a soft bristle brush.
Scrub every component thoroughly with a soft bristle brush.
If your valve components are as bad as mine, you can use a steel brush on a drill for the big stuff, followed by a light sanding with a Dremel.
If your valve components are as bad as mine, you can use a steel brush on a drill for the big stuff, followed by a light sanding with a Dremel.

1997 - 2001 Honda CR250 - Top End Service - Part 8 - Exhaust Valve Inspection - Emery Paper

Visually inspect every part for apparent signs of uneven wear or damage.
Visually inspect every part for apparent signs of uneven wear or damage.

Related: Shot-peened parts are stronger, last longer, and are definitely worth the money!

Exhaust Valve Measurements

  1. Measure the valve and flap shafts at their contact points.
  2. Both shafts should measure no LESS than 0.196 inches.
Measure the valve and flap shafts at their contact points.
Measure the valve and flap shafts at their contact points.

Exhaust Valve Governor

  1. Clean the governor and pinion shaft.
  2. Make sure the rack and pinion shaft grooves are straight and mesh smoothly.

← Part 7: Cylinder Inspection

Part 9: Clearance Calculations →

Keep Your ’97-’01 CR250 Running Right!

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