I have original retainers on my Ap1, 115k miles.

I am trying to crack them by running to 9k a lot. So far it hasn't worked

I inspect them once a year due to the dragon and as of 2 weeks ago all is good. I will leave them forever to prove they can take 9k.

 

hey billman can you please post that picture again that shows how the bad retair is sinked in? thanks

 

I wish I lived near you Billman. I'd go to you for all my S2000 needs.

 

one of our CO's has 250k plus on his F20 that he tracks and races very frequently, its been supercharged and beat on and still has the original retainers with no signs of cracking.

edit: he just dynod last week and put down 210whp NA

 

This thread has a picture from Billman.

 

I had mine replaced at 130K. I didn't over-rev the motor, but I had no idea how the 3 previous owners drove the car. And from all the horror stories I have been reading on here of permanent engine failure from a dropped valve, I wanted them changed ASAP.

Found out all of them were good with no cracks or stress marks, which tells me this car wasn't abused, or at least not over-revved.

 

Here's another...click on the picture to enlarge it for the best view. If you are looking intently, you can see the crack on the bottom of the right retainer. Look for the break in the lighting.

good on the left.....................................broken on the right

 

Im replacing mine this weekend hopefully

 

I think it should be just checked but if you haven't over-reved, shouldnt be replaced. Replaced mine at 148k miles, with 10k boosted and all my retainers were fine.

 

When i did a valve adjustment on my 01 they were all in perfect shape. That was with 70k miles i believe.