checked the valves-need advice

[killer454]

my nephews 400z quit running out on the trails.

i have put it at top-dead center and the timing and chain are good.

i have checked for valve lash and cant get my feeler gage to even come close to going under the intake or exhaust valves.

intake .010-.020 by specs i can get .004 to go but not .005 so out of range bad.

exhaust reading very bad to

would you guys say it needs 4 new valves and springs put in the head?

can anybody give me advice on what to buy for this atv


thanks from killer454

[RC FAN]

Replace all 4 valves,do a valve job and I would also change the valve slings and seals.

[fmfhonda250r]

Pull it apart before you order anything. Might just need the seats cut but you wont know till you get it apart and it might need guides as well.

[killer454]

how will i know if it needs valves?

do the valves reces into the seats or what?

i thought about removing the head to see if the valves will leak when closed.would this mean new valves.

what am i looking for?

[RC FAN]

The valves on the z are known for cupping,seat bare always good just need cleaned up for the new valves but the valves will be junk more than likely,
I prefer stock valves if your motor is mostly stock but for fully built I prefer ferra. Jmo