notstock4long
Cadet
- Joined
- Jul 3, 2016
- Messages
- 6
Hey guys,
I just joined the forum, as I recently picked up a 1990 Christ Craft 218, that is in awesome condition (other than the engine issue I'm currently experiencing). Hopefully I'll be able to contribute to the forum in the future, as I'm quite familiar with many of the automotive equivalent engines.
I have had the boat on the water twice. The first time, it wouldn't reach more than 2000 RPMs. It would hit 2000 with little throttle input, and no more with more throttle input. As it wasn't bogging down with more throttle, we thought a fuel issue was likely. I didn't do much, other than change the fuel/water separator, and attempt to change the fuel filter at the carb, but instead found only a screen, which I cleaned and reinstalled.
The second time on the water, the boat reached full RPMs (based on the specs on the spark arrestor cover, which specify max RPM of 4000-4400 at WOT). We tried both props (a 15 x 15, and a 15 x 17), with one reaching about 4200 and the other 4400, which seemed to make a lot of sense. However, the boat doesn't come close to reaching plane with either prop. It got closer when two guy got as far forward as possible, but still didn't make it. As far as I can tell, there was little no no water in the boat. After being nose up for a couple hours, I would think any retained water was pushed out by the bilge, and there was never more than an inch or so in the bilge area. Trim was all the way down as well.
I am at a loss at this point. I thought that a spun hub could be the issue, if it was only spun enough to slip under load, but not by hand), but it seems unlikely that both would be spun, but still show otherwise predictable characteristics. While running at WOT, we advanced the timing blindly, increasing the RPMs close to 5000, which increased the speed and brought the boat much closer to plane, but we experienced backfiring at that point as it was far too advanced. We also tried dumping a little more fuel into the carb at WOT, which caused a momentary bogging (not much point to that, but it was one of our planned tests if we experienced a lack of RPMs again on this trip).
FWIW, the boat has sat since fall of 2014, which is leading us to think that there may still be a fuel delivery issue, like something gummed up in the carb, but it otherwise runs perfectly...just not quickly.
Any ideas?
I just joined the forum, as I recently picked up a 1990 Christ Craft 218, that is in awesome condition (other than the engine issue I'm currently experiencing). Hopefully I'll be able to contribute to the forum in the future, as I'm quite familiar with many of the automotive equivalent engines.
I have had the boat on the water twice. The first time, it wouldn't reach more than 2000 RPMs. It would hit 2000 with little throttle input, and no more with more throttle input. As it wasn't bogging down with more throttle, we thought a fuel issue was likely. I didn't do much, other than change the fuel/water separator, and attempt to change the fuel filter at the carb, but instead found only a screen, which I cleaned and reinstalled.
The second time on the water, the boat reached full RPMs (based on the specs on the spark arrestor cover, which specify max RPM of 4000-4400 at WOT). We tried both props (a 15 x 15, and a 15 x 17), with one reaching about 4200 and the other 4400, which seemed to make a lot of sense. However, the boat doesn't come close to reaching plane with either prop. It got closer when two guy got as far forward as possible, but still didn't make it. As far as I can tell, there was little no no water in the boat. After being nose up for a couple hours, I would think any retained water was pushed out by the bilge, and there was never more than an inch or so in the bilge area. Trim was all the way down as well.
I am at a loss at this point. I thought that a spun hub could be the issue, if it was only spun enough to slip under load, but not by hand), but it seems unlikely that both would be spun, but still show otherwise predictable characteristics. While running at WOT, we advanced the timing blindly, increasing the RPMs close to 5000, which increased the speed and brought the boat much closer to plane, but we experienced backfiring at that point as it was far too advanced. We also tried dumping a little more fuel into the carb at WOT, which caused a momentary bogging (not much point to that, but it was one of our planned tests if we experienced a lack of RPMs again on this trip).
FWIW, the boat has sat since fall of 2014, which is leading us to think that there may still be a fuel delivery issue, like something gummed up in the carb, but it otherwise runs perfectly...just not quickly.
Any ideas?
