CHEMICO Valve Grinding Paste kawasaki z250c

Making sure your valves have a perfect seal is important to make sure you get proper engine compression. If your valves are scuffed you can get poor performance. At worst it can result in air being sucked when it should be blown and backfire into your carb.

Buy some cheap chemico valve grinding paste and a lapping tool. Use coarse first, then fine and make sure you clean it all off properly or else you will damage your valve guides or your cylinder.

Put paste under valve.

Use the lapping tool to grind the valve. You will probably want to do it for a minute or so to make sure it's all ground down. Minute for fine, minute for coarse.

To test the grinding put some petrol or spirits in the cyl head. The petrol should not drain down to your valve guides.