Thank u for your help will I have any problems with the race being in the 2wd. I really dont understand what the 90amps means over the 160amps.

Thank you Jamie for your fast reponce. I will definately try the forward hole setting.

Im running avid springs and wow!

Has anybody had a problem with front slipper drive cup, the pin that is in it keeps sliding out from the o-ring??

Does the o ring come off?

No it doesn't it just gets pushed out of the way by the pin

Replace the few peices and see if it does it again

Replace the slipper out drive cup?

The pin, the plastic cup and o ring

Why the wow? Are you impressed. Please explain and desribe your set up

I replaced the pin but I couldn't replace the plastic out drive cause west coast doesn't have one in stock... Any other suggestions?

I have been running kyosho big bore springs for awhile now and ran the new avids over the weekend and was way better. Car had a ton more grip, on power, off power, and even on a high speed sweeper...i wish i can fill out a set up sheet and then post a link, i would like some people to try my set up to see what they think

If your just trying to run till you get parts then maybe put a little ca glue on the end of the pin and some on the bring so it can't push away, i just took mine apart last week and had a hard time getting the pin out so i think you might have a worn out plastic cup and maybe a stretched o ring

You shouldn't have any problems.

They rate them according to how much juice they can handle. A 160amp ESC can handle more power than a 90amp ESC. That doesn't mean the 90amp ESC isn't any good, it just means you can't run crazy low turn motors. I run a Race in my daughters SC10 in 17.5 blinky and the ESC is so under stressed its ridiculous. She's run 15-20 minutes at a time practicing and the Race comes off the track @ 110-115F without a fan. You should have no issues running an 8.5. My only concern would be to check temps after 6-7 minutes if you decide not to run the fan (or can't .... B4 is a little tight).

I was about to post the same thing. I've been around the hobby for 25+ years and I've never seen that happen, not once. Very strange. I'd replace the shaft and clips and make sure they're clicking into place (like you said).