Z250 DIY Valve Clearance Adjustment

By Jolads

After finishing the break-in period, removed all external parts to access the engine, the front fairing, gas tank, seats, rear fairings.

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Then removed triangular engine bracket (optional), the ignition coil to have more space in removing the exhaust valve cover bolts. Carefully remove (to avoid damaging the o-rings) the intake and exhaust valve covers left side cam gear cover, the crankshaft bolt cover, and the flywheel timing mark cover using a wide flat screw driver but cover it w/ cloth to avoid scratches on those chromed covers.

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Now with everything exposed, put gear in neutral then using a 17mm socket wrench turn the flywheel clockwise and notice the cam gear mark, align it w/ the engine notch and at the same time using a small flashlight peek through the flywheel timing mark cover and you should see a line mark align w/ a notch, if the cam gear is aligned and the flywheel is not then turn the crankshaft bolt again another 360degrees until the cam gear and flywheel marks are aligned with their notches

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Then you can now check valve clearances, based on the manual it says 0.07mm for intake and 0.10mm for exhaust, after inserting the feeler guage I noticed mine to be out of specs so I loosened the 10mm locknut at the rocker arm and using the feeler guage (0.06mm intake) adjusted the small adjusting nut fingertight and w/ a slight drag on the feeler guage.

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After clearances are w/in specs now, then you can tighten the locknut. clean mating surfaces dirt and oil-free then apply just a small amount of silicon gasket maker on all cover o-ring seals, let is set for a few minutes then installed everything removed. Warm up the engine and check for leaks, congrats and enjoy your ride.

Jolads is a forumer of MCP (www.motorcyclephilippines.com) and is based somewhere in the Philippines.

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