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Old 13 October 2006, 18:01   #1
Kip
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Country: Ireland
Town: Cork
Boat name: Sugardaddy
Make: Humber Destroyer
Length: 6m +
Engine: Yamaha 150 4 stroke
Join Date: May 2006
Posts: 12
Humber 6.5

Have recently purchased humber 6.5 with yamaha 150 4 stroke. Both about 1-2 years old engine has only 80 hours on it. Prop is alumimium and has a tiny ding on one blade where previous owner may have clipped something.
At between 2500 -3000 revs the boat has a vibration in it and this disappears above that rev range. Is this vibration normal in this set up - would it be caused by the prop or is there a more sinister reason for it.
I intend to swap prop with one off another boat to see if it makes any difference . Anyone got any similar problems with the same set up.
Cheers.
Kip
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Old 14 October 2006, 04:23   #2
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Country: UK - England
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Make: Humber Ocean Pro
Length: 7m +
Engine: Volvo D3 160hp
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I am by no means an expert but I had a similar problem cured by sending my prop for repair. (only cost 50)
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Old 14 October 2006, 07:06   #3
alt
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Length: 5m +
Engine: 2 x Volvo KAD300
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Get that prop repaired PRONTO you're not doing your gearbox any favours matie
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Old 16 October 2006, 10:44   #4
Kip
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Country: Ireland
Town: Cork
Boat name: Sugardaddy
Make: Humber Destroyer
Length: 6m +
Engine: Yamaha 150 4 stroke
Join Date: May 2006
Posts: 12
Thanks for the feedback Lads.
Will see to prop asap.
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Old 16 October 2006, 10:46   #5
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Country: UK - England
Town: Leicester
Boat name: Vixen
Make: Ribcraft
Length: 6m +
Engine: Suzuki OB 175
MMSI: 235071839
Join Date: Jun 2004
Posts: 1,621
Get a mechanic to put a dial gauge on the propellor drive shaft and see if that is bent in any way also.
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