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bodfper
10-25-2009, 09:00 PM
Im building a 406 with an 11:1 with stg 2 hotcams cam, hd studs, crf450 timing chain, secondary oil cooler.

Is there any other things i need to do or that would be a good idea to do? I want a reliable build and dont want to take it apart again. Is there something i need to replace that has to do with the valves?
ALL HELP APPRECIATED!
coreo5
10-25-2009, 10:44 PM
i would replace the valve seals while you have it all apart...and maybe make sure the vavles are seating nice.
Pipeless416
10-25-2009, 10:55 PM
i lapped the valves, put in new seals, and my springs were right at the service limit so i replaced them too.. just to be safe.
bodfper
10-26-2009, 07:58 AM
What is lapping and how do i know if they are seated properly and how do i know if the valve springs need replaced and where do i get new valve seals?
Muzzgit
10-26-2009, 09:17 AM
Originally posted by bodfper
What is lapping and how do i know if they are seated properly and how do i know if the valve springs need replaced and where do i get new valve seals?

If you are asking those kind of questions, my advice is send it to a a machine shop who will do it for you.
bigbad400
10-26-2009, 09:55 AM
totally dude, you dont want to be messing up your valvetrain. if something lets loose its not pretty at all.
bigbad400
10-26-2009, 09:57 AM
and the valves
bodfper
10-26-2009, 08:33 PM
How do i know if my valve springs need to be replaced? Or should i replace them to be safe? Where do i get new valve seals?
Pipeless416
10-26-2009, 09:37 PM
Originally posted by bodfper
How do i know if my valve springs need to be replaced? Or should i replace them to be safe? Where do i get new valve seals?

you'll need a caliper and a manual that tells the service limits
TRXRacer1
10-28-2009, 04:44 PM
Originally posted by bigbad400
totally dude, you dont want to be messing up your valvetrain. if something lets loose its not pretty at all. You think this is the result of your valvetrain?:huh
hypersnyper6947
10-31-2009, 01:20 AM
Originally posted by TRXRacer1
You think this is the result of your valvetrain?:huh

I had a similar problem, dropped one valve and destroyed everything. Do whatever you can to prevent this it is a VERY expensive mistake if not.