Learn how to Check Valve Clearance on a Honda CRF250R :
Begin by eradicating the seat, gasoline tank, and rad shroud plastics.
With some water and a store towel wash the area across the cylinder head clean.
Take out the spark plug cap and set it aside.
Take away the two (10mm) rocker cowl bolts.
Take away the spark plug.
Remove the crankshaft hole cap from the crankcase.
Find prime lifeless centre by turning the engine over until the punch mark on the crankshaft traces up with the arrow on the crankcase . To show over the engine, slowly utilizing the kickstarter by hand and/or using an allen key on the crankshaft will work.
The crank to camshaft timing will line up in two spots, MAKE SURE that earlier than you have it so that ALL VALVES are within the closed place by merely ensuring the cam lobes are pointed up and rearward on the motorcycle (and not depressing the valves)
As soon as TDC is found, find the specified feeler gauge thickness for intake valves (refer to proprietor's handbook)
Using the best feeler gauge thickness for the intake valves, slide it down on the entrance dealing with side of the cam lobe. It should be bent slightly to get it fit between the lobe and the top of the valve bucket.
Slide the feeler gauge up and down by means of the hole a few instances to substantiate that it can move freely, and that the valve is inside spec. Repeat step for each consumption valves.
Select the optimal exhaust feeler gauge thickness as indicated within the proprietor's manual.
Utilizing the correct feeler gauge thickness for the exhaust valves, horizontally slide it beneath rocker arm tip and the top of the exhaust valve.
Slide the feeler gauge again and fourth by to confirm that it could transfer freely, and that the valve is inside spec. Repeat step for each exhaust valves.
Re-set up rocker cover and torque the two bolts to spec. (indicated in handbook)
Re-install crankcase gap cowl, spark plug and spark plug cap.
Re-install gas tank, plastics and seat.