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LoneStar Bass  |  Fishing  |  Repair & Troubleshooting  |  Topic: holeshot problems « previous next »
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Author Topic: holeshot problems  (Read 1432 times)
Keith Freyer
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Whitney Stripers
« on: March 14, 2011, 06:47:41 pm »
I have a 1989 18'6" Nitro Tourney Special bass boat with a 1987 Mariner 150hp outboard. No jacking plate yet, with a Mercury High Five 21" pitch stainless steel prop.

My problem is coming out of the hole. With just me in the boat i have no problem, but with a couple of buds in the boat it takes forever and is quite embarrassing to need 40 yards to get on a plane. Rpm's just will not come up and get the boat up.

Does anyone have any suggestions?
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Mike Kernan
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« Reply #1 on: March 15, 2011, 09:55:11 am »
Usually it is all about the prop.  A jackplate would probably help.  But you do need to eliminate motor issues.

The reason I believe there may be a motor issue is that you are using the best hole shot prop I know about.  Maybe the prop is bent up?  Does the prop have air holes on the outside of the hub?  Sometimes you can introduce air to get the rpms up.  If it has holes and all three have a plastic plug in them, remove one of the plugs.  Honestly though, I don't remember high fives have air holes.
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Keith Freyer
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Whitney Stripers
« Reply #2 on: March 15, 2011, 06:36:10 pm »
No there are no air holes in the prop and i agree with you on the motor issues. I have been having trouble with the carburators along the path of the needles sticking, yet i do believe the motor is getting worn out. I love the old boat, ive never had one that would handle rough water like this one. I will look into a engine overhaul soon.

Here's a quick question maybe you could give me some answers for...I have a 150hp, but ive heard it could be made into a 200hp with a change of reed valves and carburation...do you know anything of this?
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Billy Rowland
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« Reply #3 on: March 15, 2011, 06:46:13 pm »
call ronnie at Texas Motor works in Grand Prairie
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Billy Rowland
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Mike Kernan
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« Reply #4 on: March 15, 2011, 09:59:57 pm »
I think that is true.  Many six cylinder motors in a mfr lineup are built using the same block.  For example many years the 150, 175, and 200 were built using same block.

In more recent years, merc used the 3.0 liter block for the 200, 225, and 250.  Usually it is carburetors and computers.
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Tom Farmer
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« Reply #5 on: March 16, 2011, 08:23:30 am »
Quote from: Billy Rowland on March 15, 2011, 06:46:13 pm
call ronnie at Texas Motor works in Grand Prairie

+1 you should not have hole shot problems with a 21" pitch High 5 prop. I ran a 23"pitch 5 blade on my boat once and it about snapped my neck off at launch. It was blistering out of the hole with it. I was not happy with the top end performance but the hole shot was unbelievable!!! Call Ronnie at Texas Machine Works!!! 817-366-3403!!!
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Keith Freyer
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Whitney Stripers
« Reply #6 on: March 17, 2011, 07:12:30 pm »
I will definitly give this Ronnie a call, also i am being told that with the depth at which my motor is setting it is actually creating a problem of pushing the nose down when fully trimmed down. There's a lot of small things i will be doing starting this weekend. I appreciate all of your responses and Ive been a mechanic for 20 yrs soo bring on any automotive questions if yall have them.
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Steve Glenn
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« Reply #7 on: March 18, 2011, 09:06:42 am »
before you go looking at spending alot of money on the engine.
 1) raise the engine to the top or 2nd highest engine mounting hole
 2) try a different prop like a 21p Laser II.    it will have vent holes to help build power to get on plane.

 those older engines just don't make a lot of bottom end power, they make their power at a higher rpm.

 holler if i can help.

steve.
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Keith Freyer
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Whitney Stripers
« Reply #8 on: March 18, 2011, 08:03:52 pm »
These vent holes yall are talking about would they be closer to the lower unit on the prop with nickel to quarter size plastic plugs? Ive found those while looking today. Raising the motor is going to be my first priority and popping out those plugs if those are what yall are talking about.
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« Reply #9 on: March 21, 2011, 12:04:09 pm »
Thats it.  Pop out one plug at a time after the height adjustment.
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Keith Freyer
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Whitney Stripers
« Reply #10 on: March 21, 2011, 06:44:26 pm »
Umm...one at a time? uh oh...ok, im sure i can plug them back up. I figured there are five blades, five holes, pop'em out. Thanks for the help guys.
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Keith Freyer
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Whitney Stripers
« Reply #11 on: April 02, 2011, 08:27:01 pm »
Got all problems solved and worked out, couldn't raise the height of the motor due to the lower unit not having low water pick up, yet butterfly's in carburator sync was off and two carbs were dirty. Cleaned carbs, reinstalled 4 of the 5 pro vent system plugs and managed to get 55mph out of it this afternoon.
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Mike Kernan
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« Reply #12 on: April 04, 2011, 02:42:02 pm »
Nice to hear Keith.
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