Yamaha 100 Hp 4 Stroke

[Mad-One]

Hi...............I am contenplating by a new boat and it is already fitted with a new Yamaha 100hp 4stroke, I was wondering if anyone has one or had one and if so what their opinion of them is. Thank yuo in advance:D

Cheers Mad 8-)

[snelly1971]

Hi Mad....never owned a one but driven plenty commercial 4 strokes.....they are having alot of trouble here in the aquaculture industry with the yammie 4 strokes ......have heard that because they want them to be as light as possible they make the block thickness as thin as possible .....resulting in many....here....blowing up....as i said ...i live in a small town....and know of at least 6 doing the same thing....2 had only done 50 hrs...they were 60 yammies....cheers mick

[nofrills]

hey mad

ive got a 2002 F100 yamaha.700 hrs hrs of perfect service so far.

touch wood ;)

cheers scotty

[Noelm]

gees snelly I thought all the Yamaha owners would have beat you to death by now! saying that some have "blown up"

[Wayne_Red]

A pro in my area has a 100 4s yam on his trap boat. One of my mates knows him well. Has had it for 4-5 years know with no probs. Probably got 3-4000 hrs on it by now.
wayne

[Mad-One]

Thanks For the info Guy's.........Much appreciated

Cheers Mad

[Grunter71]

I was looking at the Yamaha 100/80 4s on a U.S. site and they are marketed over there as 90/75 hp.

Does anyone know anything about this? I believe there is the "Marketing exaggeration thing" where they are allowed to round the H.P. up to the nearest number, as long as it isn't more than 10% of the actual HP. I would have thought the yanks would have also done this.

[snelly1971]

Well Noelm i am a yamaha man....but i can only write what i know to be true...what i wrote isnt second hand info....comes direct from working with 4 stroke yammies and there owners.....ps....you dont see many ab divers here using them...??????

[Wayne_Red]

Snelly
You had got me curious now, what motors are the ab divers using? Big ones i bet.

[snelly1971]

Mainly 2 strokes 130 twins up to 200/225 twins alot now are turning to the suzuki`s here in tassie...

[Noelm]

don't think too many abb divers would use a 4 stroke, they have big two strokes that go as fast as the boat is capable of (and then some)

[snelly1971]

I was speaking to another Yamaha owner today....7 meter poly boat....twin 150 4 strokes...gearboxes shit themselves...replaced under warranty...they told him there was a design fault with the 150 yammie boxes...

[mromanis]

A number of boat hire business's I know use Tohatsu for 2 stroke, Yamaha for 4 stroke. These motors are generally in the in the smaller Hp range, 12-30. I asked one of the operaters why a couple of months ago and he said "reliability mainly."
I admit I don't know a great deal about marine engines yet, so I can't vouch for this 100%. But just thought it interseting in the light of some of the bad outcomes that people know of.
Matthew.