Installing valves

[ZombiePotatoSalad]

All my valves, save for one, need replaced. I ordered some valves online, they came from another bike. In this instance, I'm guessing I will have to lap them, to ensure a better fit with the seats. Is lapping difficult? Well, a better question in my case is: how easy is it to screw up?

[fastbysuzuki]

Success will only be possible if your second hand valves are all straight I would use the hand method with the rubber sucker it's not hard to do search YouTube and you will get the idea on how to do it start off with fine grinding paste important. when you have done grinding in all the valves make sure you clean the head throughly so every bit of the paste is removed.

[Maddevill]

If you don't have the suction cup tool, you can put the valve through the guide then slip some rubber tubing
over the valve stem. This will give you something to hold as you spin the valve.

Mad

[cowboyup3371]

http://members.dslextreme.com/users/...LAP_VALVES.pdf -This is on Basscliff's site

[ZombiePotatoSalad]

When lapping, which cuts down faster: the valve, or the valve seat? When I just set the valve in the seat with no springs or keeper and shine a light under it, a tiny bit of light shows through. It looks like more the valve seat than the valve.