picked up an old used duratrax maximum st for cheap, but the motor has almost no compression. what motor will fit to replace the old torq .12 thats in it? I tried putting my associated .15 in but the shaft is way to short so the clutch bell doesn't meet up with the spur gear. I guess I need to know what engines have a long shaft. I'm a bit of a nitro newbie so I'm somewhat clueless with what will work. thanks guys.