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outboard motor help

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    Posted: 08/12/2012 at 8:04pm
got a 21 ft pontoon with a 75 hp outboard tracker , was on the lake yesterday and the best way to descibe it is at any speed everything is smooth then all of a sudden for like a second or so it feels like a vibrator then smooth again just randomly does it in little spurts from starting off all the way to full throttle ,  and then it's doing something else you can be running along about 1/2 or 3/4 throttle and all of a sudden the rpms revs up and it's like you just throttle the crud out of it or it just came out of the water or something pull the throttle back down to nearly nothing and start over again and it will do it again in a little bit it's like you threw it up in neutral and rpm's goes crazy , out yesterday about 6 hrs and it done it 6 or more times , couple times while pulling a tube , other than that it runs great , any body have any ideas  ?  when it starts getting cold guess i'll have it checked out just don't want to get stranded and maybe with everybody's help i won't get ripped off at a boat mechanic .  thanks

Edited by promad - 08/12/2012 at 8:04pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NH Tooner Quote  Post ReplyReply Direct Link To This Post Posted: 08/12/2012 at 8:22pm
Spun the hub in the prop? Do you have a spare to try?
Dave


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 08/12/2012 at 9:15pm
I agree, sounds like a spun hub
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Post Options Post Options   Thanks (0) Thanks(0)   Quote promad Quote  Post ReplyReply Direct Link To This Post Posted: 08/12/2012 at 9:22pm
well i'm pretty mechanicly inclined is that a easy fix or pretty complicated  ? and i guess it will get worse the more i use it ?  any extra info will be great , oh yea no don't have a spare .

Edited by promad - 08/12/2012 at 9:22pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 08/12/2012 at 9:27pm
not something an average person can fix, has to be taken to a prop shop to get a new hub press fitted in
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Post Options Post Options   Thanks (0) Thanks(0)   Quote promad Quote  Post ReplyReply Direct Link To This Post Posted: 08/12/2012 at 9:42pm
the prop has some chips and was thinking of getting a new one , it's a 3 blade don't know the pitch right now if i buy a prop will it come with a hub pressed in already ? , is the prop easy to get off or do you have to have a puller ?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 08/12/2012 at 9:57pm
Should be fairly easy to remove
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 08/12/2012 at 10:00pm
Remember Tracker DOES not make motors, if you want help with your motor, ID your boat and motor specifics in your signature line (profile). If memory serves me right, you have a Mercury motor so never identify your motor as a Tracker motor cause they really don't exist Wink other than sticking their brand on a Mercury or Johnson/Evinrude motors. When it comes to buying parts, you'll never find Tracker motor parts Wink
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Post Options Post Options   Thanks (0) Thanks(0)   Quote promad Quote  Post ReplyReply Direct Link To This Post Posted: 08/12/2012 at 10:18pm
If I buy a new prop will it already come with a hub in it
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 08/12/2012 at 10:23pm

Don't know about all props, but the one I bought I had to buy a hub kit with it, those just slide into place, they have large grooves. I got mine from here

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Post Options Post Options   Thanks (0) Thanks(0)   Quote CajunDiver Quote  Post ReplyReply Direct Link To This Post Posted: 08/12/2012 at 11:15pm
My 250 Mercury's have a plastic hub that slides right in but as Charles said we need to know motor brand. It may have a Tracker sticker but thats not the brand of motor.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 08/13/2012 at 12:03am
Some props like the ones on 40/50 Force motors have are pinned, so the hub are pressed into place on those, has a small cone that screws onto the end of the prop shaft, then a pin goes through it and the prop shaft. In either case those, they have rubber on the metal shafts, and sometimes the metal spins on the rubber. Seen that happen a lot on the older props (aged) but if the prop is in good shape, its cheaper to rehub it than to buy a new prop. If yours is dinged up that will hurt the motor lower and upper areas over time and it'll wear out the seals on the lower unit and if you don't stay on top of it, cost you BIG bucks down the road
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Post Options Post Options   Thanks (0) Thanks(0)   Quote promad Quote  Post ReplyReply Direct Link To This Post Posted: 08/13/2012 at 7:43am
It's a mercury 75 hp 1998 model
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Post Options Post Options   Thanks (0) Thanks(0)   Quote promad Quote  Post ReplyReply Direct Link To This Post Posted: 08/13/2012 at 9:19am
I'm pretty much new to the boat scene , I looked at the prop this morning and it looked like it had 11.1 x 18 does that sound right for the pitch ? We're would be the best place to find one as far as price goes ?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NH Tooner Quote  Post ReplyReply Direct Link To This Post Posted: 08/13/2012 at 10:11am
Sounds like the 18 pitch is to high. Could it be a 13?. What is the wide open throttle RPM of the motor?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote promad Quote  Post ReplyReply Direct Link To This Post Posted: 08/13/2012 at 10:40am
Yes it could have been a 13 it was early this morning still a little dark , wide open this weekend was around 42 assuming it is right and about 17 mph
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 08/13/2012 at 10:48am
When I hunted for one, best price was that link I posted above. Then again, might find a stainless on craigslist fairly cheap. I got one for $100 when I spotted on in VA right where VaGent lived at, so he picked it up for me. Its on my bass boat now. Those usually sell for 300+
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NH Tooner Quote  Post ReplyReply Direct Link To This Post Posted: 08/13/2012 at 11:36am
Originally posted by promad promad wrote:

Yes it could have been a 13 it was early this morning still a little dark , wide open this weekend was around 42 assuming it is right and about 17 mph
4200 is to low. Should be around 5600-5800. so it could be an 18 pitch. Should be around a 11- 12 pitch. Rule of thumb is that lowering the pitch 1" will raise the RPM 200.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote billlyb Quote  Post ReplyReply Direct Link To This Post Posted: 08/13/2012 at 3:53pm
looks like ur on the right road. but u will need a mechanic some day so ask @ a shop about ur prop and u can feel them out   for the day u will need a mechanic ss props dont flex like aluminum but the lower will not like it alum is softer so if there no rocks in ur futur ss is good for u if u need it the is usuallt ss is for hi hp motors so try and save some $$$$$$
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Post Options Post Options   Thanks (0) Thanks(0)   Quote promad Quote  Post ReplyReply Direct Link To This Post Posted: 08/13/2012 at 6:39pm
looked at it again it is a ( 11.1 x 13)  had to get a magnifier my eyes ain't what they used to be , lol
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Post Options Post Options   Thanks (0) Thanks(0)   Quote promad Quote  Post ReplyReply Direct Link To This Post Posted: 08/13/2012 at 7:13pm
ok i'm getting confused here , my motor says tracker force power series 75 hp , but it's made by mercury marine , so how come some sites show mercury and force  , so when looking for parts what do i look under , i found a prop under force 75 hp , would it fit , i want to finish my profile too so i want to put the right thing , lol . thanks
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 08/13/2012 at 7:58pm
What is the serial number of the engine?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote promad Quote  Post ReplyReply Direct Link To This Post Posted: 08/13/2012 at 8:19pm
OE321920 is the number on the tag
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 08/13/2012 at 9:09pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 08/13/2012 at 9:32pm
There, it took a little doing, but I finally got enough info on your boat and motor into your signature so people don't have to ask for that info from you in the future. Wink
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Post Options Post Options   Thanks (0) Thanks(0)   Quote promad Quote  Post ReplyReply Direct Link To This Post Posted: 08/13/2012 at 9:41pm
cool , thanks alot , thank i could get some help finding a prop  ? , i found a couple just don't know enough about it to be sure it would work , lol
 
 
1997 suntracker              
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force 75 hp
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 08/14/2012 at 12:13am
make sure they are for mercury not OMC, think yours is a 13 spline, OMC's are 15's usually so what props are you looking at, and what are you wanting. If you have a 11.1x13 but if its spinning on the hub, you won't get an accurate reading.
 
Prop calculator shows 10.75x12 OR 12x10.5 or 12.5x8. Looking at your situation I'm thinking either the 12x10.5 or 12.5x8 is going to get your WOT best
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SunBlocker Quote  Post ReplyReply Direct Link To This Post Posted: 08/14/2012 at 8:00am
Originally posted by PoliceK9 PoliceK9 wrote:

make sure they are for mercury not OMC, think yours is a 13 spline, OMC's are 15's usually

You can't really rely on that.  All of my OMC and BRP (current Evinrude) stuff is 13 spline....
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Post Options Post Options   Thanks (0) Thanks(0)   Quote promad Quote  Post ReplyReply Direct Link To This Post Posted: 08/14/2012 at 8:33am
I just want something good all around , I know you can't have the best of both worlds but I pull tubes , fishing I troll for striped and hybrids or I am that's the plans anyways, usually have at least 3 people on all the time plus gear .
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NH Tooner Quote  Post ReplyReply Direct Link To This Post Posted: 08/14/2012 at 10:19am
All of the props that Charles mentions should be around the same results.  The lower the pitch the higher the RPM.  The bigger the diameter the higher the RPM
Dave


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