Stunt Cycle normal operation

tester007

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Just got one of these. Worked when got it, but has a lighter horizontal band that scrolls up through the screen. So I started to replace caps.. did the monitor, no change. Then did all of the game pcb, no change. There were a couple IC's on the board that were socketed with machine pin sockets. The game though would play I believe properly, but when it went to attract, I could turn the throttle all the way up and the attract cycle would move at the speed I cranked it at. There is no return spring for the throttle so I am not sure if this is something that is normal. The legs were black on a couple ic's, so I pulled those out, cleaned them, and the game had issues. Sound was out, and the controls for the throttle seemed off.

I replaced the sockets with dual swipe, and the sound came back. The throttle response in attract was gone. At some point I had turned the pot in the center of game pcb back and forth to clean the wipe.

So, upon reading some threads to track down the monitor interference, I read a post about that pot, that it adjusted the cycle speed and gravity. Since the cycle would fly off the right side of the screen when jumping at full, I thought it was too much. Also when it hit the up ramp, it would do it's crash as the cycle flew off the right side.. So I adjusted it down so at full throttle the cycle lands at the far right edge of screen. However, when I first got this, when the cycle started out, if I cranked the throttle to hard the cycle would flip over and crash. I had to go to the max end of the throttle turn to get much of a speed increase as well.

So I am wondering for those that have unmolested games, if it is normal for the cycle to flip over if you turn the throttle too hard during the run? It made sense if you did too hard a wheelie that it would flip, but it doesn't now even if you start out full crank. It pops a wheelie, but no flip.
 
I don't ever remember seeing the cycle flipping, even when it was a newish game in the arcade. Mine doesn't do it either. Have you had a look at the manual to see if it's an option?

On mine, the bike will jump completely off of the screen if you've had the throttle cranked up all the way since before hitting the bottom of the screen.

Don't know if this is right or not, but the kids have more fun jumping it off of the screen than actually trying to jump the buses, so I'm going to leave it that way.

-JM
 
I briefly looked but nothing in detail. It seemed to make sense like you had to hold a wheelie with some skill or it would flip backwards from a gameplay standpoint.
 
If you give it to much gas or over shoot the jump the bike flips end to end
 
I don't remember flipping over backwards on mine, but it has been gone 6 years or so now, so my memory could be foggy.
 
The hum bar I had on mine was due to the filter board. Do you still have yours connected? I removed that and it cleared up. Like Braido said the bike should flip backwards if you give it to much gas or overshoot the ramp be more than a 1/2" or so.
 
The hum bar I had on mine was due to the filter board. Do you still have yours connected? I removed that and it cleared up. Like Braido said the bike should flip backwards if you give it to much gas or overshoot the ramp be more than a 1/2" or so.

Ya mine crashes if I overshoot.. so ok.. know the flip then is what it is supposed to do. I will have to look and try and find out why it doesn't do it anymore.. it stopped after messing with the socketed ic's. I don't think I can get it to do it again with the pot. I recall reading some of the manual that there is a section for gravity and will probably start there as I think one of the ic's I touched was in that section.

I think I read your thread and pulled my filter board off and went directly into the pcb. A couple things though were not working.. cannot recall but it was like yours.. the coinup or the start button or something.. There is a wire soldered as a bypass off a couple burnt connectors so have to look closer. It is pretty faint now but still irritating.
 
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