I just bought a new in box Kyosho GP Ultima ST. I was running it today (5-7 minutes) to break it in (not to hard), everything was fine my neighbour starting talking to me so i put the brakes on car stalled.

I tried starting it back up then i realized that the back tires were spinning every pull i took (i don't think it was doing it before). No when i put the truck flat on the ground (turned off or on) and try and push it forward the back wheels stay locked.

I removed the spur gear and the rear wheels move without a problem. Has anyone experienced this? thanks

It's probably your clutch. Remove the clutch bell and inspect your clutch. The shoes might have melted because the brake was dragging. Or your clutch spring might be broken.

Damn, is that normal considering that the truck has only been run for about 10 minutes total. Well i don't have the instructions and this is my first nitro truck, so i'm not really sure what all the pieces are called, how would i go about removing the clutch bell (where is it located). Sorry for sounding like such a newb, but i'll start searching on my own aswell.[sm=redface.gif]

OK, you said you removed the spur gear. So I assume you know which one that is. It's the largest gear. Next to the spur, there should be a smaller gear, called a pinion gear. This gear is attached to the clutch bell. To remove the clutch bell, it might be necessary to remove the engine, since it's attached to the engine. To remove the clutch bel you have to unscrew one screw in the middle of the small pinion gear. The clutch bell should slide right off. Inside you will see the clutch shoes. If you're clutch shoes are indeed melted, you might have some dificulty removing the clutch bell. If I were you, I would search for the manual, most manufacturers put them on their website, so check out Kyosho's website.

It's not entirely normal that the clutch melted this fast. But if the brake linkage or the idle set screw wasn't setup correctly, it can happen. You should pay notice that when you do not apply throttle, so if you let the car idle, the car shouldn't move. Or at most a little bit. But the brakes shouldn't be applied either. So if the car's in idle, you should be able to push the car. That way you are shure that the brake isn't dragging, while the clutch is engaged. If the brake is applied, the clutch bell won't be able to spin, but if the engine's idle is set too high, the clutch shoes will touch the inside of the clutch bell. This will cause them to melt.

If you are a newb, this might sound a little complicated, but is not. If you take a look at the clutch, you can figure out how it works, and it will become clear

If you have more questions, shoot.

On the bottom of [link=http://www.kyosho.co.jp/instructionmanual/buggy/buggycar_index-e.html]this page[/link] you can download the manual for the kyosho GP ultima st

tjaf your awesome thanks for your help. I just started printing out the manual for the Utlima ST evolution Type R that i found on the kyosho website. Well i start printing the others.

The clutch bell spins freely, which in turn spins the pinion, spur gear and eventually wheels. So the problem is further up. I'll take it apart after i get home from work, that in mind i'm already late!! thanks, again

Ok i got home printed out the manual, read through abit and then started taking her apart.

The Clutch bell came off easy and it looks like there is stuff (plastic, most likely part of the clutch shoe) burnt on to the inner walls. The Clutch spring looks perfectly fine, but the clutch shoe looks like some of it has melted off (not really sure what it looked like before).

so know with all of the pieces off, when i pull the ripcord the pilot shaft and the flywheel set spin. Is this normal or should i keep removing pieces?

Here are a couple of pics:

I would check your one way bearing too.

where is it located and how do i check it out?

If you pull the ripcord the flywheel should spin, that's normal. Point is, that the clutch should not be touching the clutchbell, so that eventhough the flywheel spins, the clutchbell won't, and so the wheels won't. Try to remove the melted plastic from the inside of your clutch bell.There should not be any plastic on the clutch bell. If you put the clutch inside the clutchbell, the clutch should not touch the sides of the bell anywhere. The shoes don't look too worn (difficult to see on pics), you can always try the same ones, but shoes like that don't cost alot.

I put it back together last night and i'm gonna try running her today. I removed all the burnt plastic from the inside of the bell and a bit off the shoe. Now the shoe spins freely inside the bell.

i'm just going to go through the manual and tune it up a bit more and then i'll fire her up. Thanks

she's running now, but it seems that it taks her a little longer to get going than before. I'll buy a new clutch shoe this week see if that solves the problem.