I was getting ready to run the Spartan today and I accidentally greased the end of the prop shaft where it is inserted into the motor coupler.
I took it on a run and immediately noticed the boat just hit a wall... I brought it back in and there was a very little bit of smoke. As I suspected, the prop shaft was spinning inside of the engine coupler (part 5761). I brought the boat inside, removed the prop shaft, and removed as much grease as possible. Long story short, I have tried to snug the engine coupler 3 times and it continues to slip when driven. I even moved the shaft back a little further back to try to fasten onto a part of the shaft that was not worn down. Luckily I was able to bring the boat back in each time. Each time I brought it in I could manually spin the propeller while holding the engine coupler stationary with the 10mm tool. You could clearly see the shaft spinning inside of the engine coupler.
I noticed on the shaft it has a little bit of wear where the coupler holds onto the prop shaft. I plan on removing the engine coupler to inspect it for wear and clean it sometime this weekend.
So my question is, should I go ahead and order a new prop shaft (5729) with engine coupler (5761)? Are there any better prop shafts available for the spartan? I spoke with the local hobby shop and they said that you could simply solder on more metal if the prop shaft was a bit worn down.
That's what I get for being in a rush and trying to run the boat before the wife got home, lol