Humber 6.5

[Kip]

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

[Paul]

I am by no means an expert but I had a similar problem cured by sending my prop for repair. (only cost £50)

[alt]

Get that prop repaired PRONTO you're not doing your gearbox any favours matie

[Kip]

Thanks for the feedback Lads.
Will see to prop asap.

[Simon B]

Get a mechanic to put a dial gauge on the propellor drive shaft and see if that is bent in any way also.