jasonspeedy
Well-Known Member
- Joined
- Feb 12, 2004
- Messages
- 53
Hey guys, I need some serious expert advice, especially from AB if he's out there. I've got an older MAC .67 with very low hours. I first put it in a scratch-built rigger that was running on 5 points. No matter what the needle, the boat would eventually go into what seems like a lean bog, only quicker with a leaner needle. I thought I may have a load issue, so I went to a smaller prop, tried different stingers, got rid of the rear sponsons, etc...I even drilled the spraybar. I decided that my boat was crap, until I bought a sprint cat. The motor exhibits the same symptoms. I literally replaced everything in the sprint-cat, piece by piece, to isolate the problem, but the MAC does the same thing over and over. The only difference in setup is that the OPS (which runs great in the cat) has a cooled header. I've tried pipe lengths of 11 to 11.5 inches. I think I'm missing something or looking at the problem in the wrong way. The MAC motor appears to be fine...no leaks, compression is good, hc is about .011, but I just can't figure it out. Any ideas? The only thing I haven't done is change the water lines from medium to large.
Jason
Jason