intake valve problem on eh29c engine

[rat patrol]

hello i have a 95 jacobsen gxj 810 with a robin eh29c engine. i replaced the valves about a year ago and have adjusted them once a month to .4000 but the adjusting screws on the intake valves show me that the valves need replacing again. i laped the valves in the head with valve grinding compound replaced the guides and seals.what could cause the intake valves to wear this quick? thanks for any advice.rat patrol

[wthompson]

but the adjusting screws on the intake valves show me that the valves need replacing again. rat patrol

How do you determine the valves are bad by the adjusting screw?

[rat patrol]

i have to keep adjusting the intake valves to maintain the .4000 gap therefore the adjusting screws have 3/8" more threads showing than the exhaust.

[rat patrol]

i took the head off my engine today and one of the intake valves had gone up into the head and the other one was close.i replaced the valves about a year ago.are the valves supposed to wear that fast ? when i replace them and adjust to .004 it runs like new again.thanks for any feedback. rat patrol.

[Larry1950]

Not sure I read this right. If the valve has gone up into the head the seat is either gone or bad in the head. You sure the seat is intact? Can you post a pix?