Guidance on How to Check Valve Clearances on a Honda CRF250R

HondaNewsToday. - Here is Guidance on How to Check Valve Clearances on a Honda CRF250R. This guidance will guide you to Check Valve Clearances on a Honda CRF250R. Regularly checking valve clearances on your modern 4-stroke racing machine is critical to keeping you and your bike competitive. Because of their incredible power output and insane RPM capabilities, these engines need to be maintained regularly and properly. More often then not, such a simple procedure as checking valve clearances is overlooked, and can easily lead to a major engine (and wallet) disaster.

Source: www.wikihow.com

1. Start by removing the seat, gas tank, and rad shroud plastics.
2. With some water and a shop towel wash the area around the cylinder head clean.
3. Take out the spark plug cap and set it aside.
4. Remove the 2 (10mm) rocker cover bolts.
5. Remove the spark plug.
6. Remove the crankshaft hole cap from the crankcase.
7. Find top dead centre by turning the engine over until the punch mark on the crankshaft lines up with the arrow on the crankcase 
8. Once TDC is found, find the specified feeler gauge thickness for intake valves (refer to owner's manual)
9. Using the right feeler gauge thickness for the intake valves, slide it down on the front facing side of the cam lobe.
10. Slide the feeler gauge up and down through the gap a couple of times to confirm that it can move freely, and that the valve is within spec. 
11. Select the optimal exhaust feeler gauge thickness as indicated in the owner's manual.
12. Using the proper feeler gauge thickness for the exhaust valves, horizontally slide it beneath rocker arm tip and the top of the exhaust valve.
13. Slide the feeler gauge back and fourth through to confirm that it can move freely, and that the valve is within spec.
14. Re-install rocker cover and torque the 2 bolts to spec.
15. Re-install crankcase hole cover, spark plug and spark plug cap.
16. Re-install gas tank, plastics and seat.
17. Done!

The original article : "How to Check Valve Clearances on a Honda CRF250R"

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