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hello Marc, Kyosho made 3 types of top shafts for the optima / ultima series: 1. Threaded on the end - This was used on the early optimas. It acted like a slipper clutch, by allowing the outside gear to spin. While this was a nice idea, the threaded part of the shaft was 3mm and it broke if it was t...

Here's a picture of my jrx2 with the proformance kit (rear shocks are mounted in front of the rear shock tower). jrx pro final.jpg My optima. Had a ton of upgrades (belt drive, hot trick conversion, platnimum shocks, 48 pitch gears, etc). The only thing I didn't get for it was that ugly javelin body...

Hello All, I wanted to post some information about the Jrx2 Proformance kit. The proformance kit is basically converts the x2 into a pro. The kit came out before the jrx pro (like the lxt conversion came out before the lxt kit). Chassis The chassis is pretty much the same as the pro, except there wa...

I just built a couple of coyote's and I broke 2 of the new arms. I then began polishing the suspension balls and everything is much smoother. No more broken arms and no more binding. I haven't finished the cars yet because the next project was tying to get the shocks to work properly. There's just s...