OK, help a guy out a little. I have an '89 GT 150 on a TF 1800. Narrower hull than the newer designs but deeper too. Does surprisingly wellin rough water. My prop is a 14 X 24 1/2 Raker 3 blade. WOT I run at 5100 RPMs and about 56-57 mph. Sound right? I have talked to many people about the older OMCs and everyone including techs have told me that they were designed to run hot, near redline which is 5500. I checked my motor height per folks at Tracker that remember that hull and know a LOT more about my boat than I do, and it is set at the optimal height. Should I be getting any more revolutions? My speed is fine, but if I can pick 1-2 mph or should be running hotter for the durability of my motor I want to know.I don't really have the HP to turn a bigger prop. If I went down but up in pitch, what would be the result? Any help would be appreciated. I just got my prop back again and have to tweak it with the shop. Tonight is perfect! 75 degrees and the lake is like glass!
Help Support Nitro Owners Forum:
Pierre Voisine
Well-Known Member
- Joined
- Mar 15, 2000
- Messages
- 709
- Reaction score
- 0
Nothing else!!
pierre
pierre
Thanks Bob, stuck rings is what did me in this last time. Should have seen those pistons! Scored bad. It is completely rebuilt now. I am running double oil for break in. Should I run tuner in it soon or wait? So my RPMs are fine though? I just had that carbs rebuilt too, should I mess with them yet or monitor the performance?
Jon Puhalski
Well-Known Member
I've got the '90 175 TF with the GT150 and my motor is running nearly identical to yours. Hole shot sucks doesn't it? Would love to try a 4 blade.
David Jordan
Well-Known Member
- Joined
- Aug 4, 2001
- Messages
- 294
- Reaction score
- 0
Hey Bob, I have the same boat as Rob but with a Johnson 1995 150 Fastrike. I'm using a 4 blade SS 23" Jonhson renegade prop. 59mph at 5350 rpm on gps. I' carb tuned it last year. Any advise how to keep this baby running for a long time would be helpfull. I'm happy with the speed and hole shot and feel this is an optimum setting without adding a jackplate. 1.5" below the pad
Dave, Fastrikes are great outboards. Friend of mine has one.
OK update. Ran the ole money pit last night with a newly tuned prop. Water was a little choppy, but at WOT (most extra oil is gone now from tank) I hit 4900 - 5000 rpms and 55 mph. I assume on calmer water, when I can trim out more, and the rest of the oil is gone from the gas, and it is completely broke in, I should be hitting 5100 rpms and about 57 mph. Sounds about perfect to me. Thanks for all the help guys. Bob, how much should I expect to invest in altering the timing and a new set of reeds? Keep in mind, I just dumped $4k into it, and still need new seats and a gelcoat refinish!
OK update. Ran the ole money pit last night with a newly tuned prop. Water was a little choppy, but at WOT (most extra oil is gone now from tank) I hit 4900 - 5000 rpms and 55 mph. I assume on calmer water, when I can trim out more, and the rest of the oil is gone from the gas, and it is completely broke in, I should be hitting 5100 rpms and about 57 mph. Sounds about perfect to me. Thanks for all the help guys. Bob, how much should I expect to invest in altering the timing and a new set of reeds? Keep in mind, I just dumped $4k into it, and still need new seats and a gelcoat refinish!
