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#1
09-21-2009, 11:39 AM
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OUTBOARD MOTOR VIBRATION ONLY AT LOW SPEEDS
My 1997 Johnson 200 hp vibrates at low speeds....not at idle and not at medium to full throttle (dissapears completely and runs without vibration). What could be causing this vibration??? The vibration does not affect the performance in any way and no loss of power whatsoever...just annoying as heck! I do have a stainless steel prop and it does have a couple nicks and slight bend in one blade...could this be the culprit????..or is it something else
How to troubleshoot etc. etc. would also be appreciated..or any help. thanks -FRED
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"...Southern by the grace of God" 
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#2
09-21-2009, 01:40 PM
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Re: OUTBOARD MOTOR VIBRATION ONLY AT LOW SPEEDS
Has it always done it or is it new? I lost the pin (don't know it's proper name )that adjusts the down tilt position and when tilted all the way down would do just as you described. Bent prop would cause that also.
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" I'm the one thats got to die when its time for me to die; so let me live my life, the way I want to". J. M. Hendrix
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#3
09-21-2009, 01:43 PM
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Re: OUTBOARD MOTOR VIBRATION ONLY AT LOW SPEEDS
The bent prop blade is probably it.Take it of and take it to your local prop shop.Most boatyards have one.Thats my guess anyway.
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tyler 1988 20cc
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#4
09-21-2009, 02:06 PM
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Re: OUTBOARD MOTOR VIBRATION ONLY AT LOW SPEEDS
There is a very noticable difference b/w props. My mirage plus 15 1/2" 17P has a LOT more vibration than a 17P highfive at idle speeds or even an aluminum 14 1/2 17P. Mirage Plus was brand new in box.
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#5
09-21-2009, 02:37 PM
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Re: OUTBOARD MOTOR VIBRATION ONLY AT LOW SPEEDS
Thanks all for input......
this is a new to me rebuilt motor and I got prop from my neighbor..believe it is a 15x17p (again stainless but dont know the brand) The motor has good compression spark etc. I was wondering if I could run on hose with the prop and put in gear and push throttle until I felt vibration and then do it without prop on motor to see if a difference....would I be at risk of damaging motor by putting in gear and revving up???? without being in water and without prop on shaft?? I will look into having prop balanced straightened etc. but want to run some type of test first to see if this is the culprit...did search on google and no real definate test has come up for this problem! Thanks again Fred
__________________
"...Southern by the grace of God"
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#6
09-21-2009, 04:12 PM
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Re: OUTBOARD MOTOR VIBRATION ONLY AT LOW SPEEDS
Put the boat in the water. Based upon my experience . . . heavy large diameter 3 blade props seem to vibrate a lot more than light weight aluminum 3 blade or 4 blade or 5 blade props. I have an explanation . . . but that is just my observation.
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#7
09-21-2009, 04:16 PM
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Re: OUTBOARD MOTOR VIBRATION ONLY AT LOW SPEEDS
Hey Fred,
Glad you`re not being a stranger. You need resistance when going into gear or your lower unit will be mad at you. Bobby Soles Prop service in Riviera/ Mangonia has a pretty good rep.
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#9
09-21-2009, 07:44 PM
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Re: OUTBOARD MOTOR VIBRATION ONLY AT LOW SPEEDS
I agree Bobby soles is great they can run it on a machine and tell ya something. If prop is bad.. Heading their Tommorrow.. Need new prop for my yammy and merc Pretty nice and helpful
Chris 
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#10
09-21-2009, 09:30 PM
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Re: OUTBOARD MOTOR VIBRATION ONLY AT LOW SPEEDS
Hey Sandy...been hanging around.and watching and waiting
 ..taking my prop to Bobby Soles in Stuart tomorrow..at least I can keep it as a spare...Will try recond prop out this weekend...should run about 85 bucks..per phone quote.I do have pin on my motor it is set on number 4?...hopefully this is the problem...not used to running a stainless prop...its a heavy sucker!! Thanks all for the great input! FRED
__________________
"...Southern by the grace of God"
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