Bigger outboard restrictions

[beamishken]

I haven't tested WOT with a skiier. I don't think it would be massivley difference, the issue is pulling them out, rather than flat-out.[/QUOTE]

I doubt your skier would be too chuffed hanging on @ 40mph ish while you check wot rpm lol
Your in the middle of the rpm range so switching down to get nearer the upper limit makes sense

[simonl]

Moving from 19" to 17" will make hell of a difference in getting the skier up.
WOT with a skier behind is pretty irrelevant, but a big skier can easily lose you a few mph.

It's worth noting that the size of the skier plus the number & size of skis have a huge bearing on the power required. Then there's technique - If I apply poor technique (deliberately or otherwise) on smallish mono I can prevent a 90Hp engine from pulling me out.

[mhb100]

Originally Posted by simonl

Moving from 19" to 17" will make hell of a difference in getting the skier up.
WOT with a skier behind is pretty irrelevant, but a big skier can easily lose you a few mph.

It's worth noting that the size of the skier plus the number & size of skis have a huge bearing on the power required. Then there's technique - If I apply poor technique (deliberately or otherwise) on smallish mono I can prevent a 90Hp engine from pulling me out.

Dave I gave just read an excellent article which describes exactly your problem. I can't seem to copy the link. here is the start of that post.

[mhb100]

Originally Posted by mhb100

Dave I gave just read an excellent article which describes exactly your problem. I can't seem to copy the link. Attachment 122152Attachment 122153 here is the start of that post.

Also checked the prop I had on my Bf90 that rowed skiers fine. It was a laser stainless 20'. confident props not your problem.

[totallydave]

Originally Posted by mhb100

Dave I gave just read an excellent article which describes exactly your problem. I can't seem to copy the link. Attachment 122152Attachment 122153 here is the start of that post.

Yes - this is exactly the issue, and now appears to be a 'well known' flaw.

Their recommendation of just lifting the throttle to ~1600RPM for a little while before slamming it open is exactly what I do. Although I had to laugh at their view that it is a problem seen getting the boat onto a trailer - I can't imagine using sudden blasts of full throttle for this (I tend to glide onto mine with the engine still in low revs to help wind it on).

Anyway, it seems that it is just one of those things to live with, but that a smaller prop would help a bit - so that's my plan... Know and avoid the issue, keep the carbs clean and drop a prop size for skiing.

Thanks all to those contributing - and especially those offing alternative props. As usual you guys are brilliant!

[Last Tango]

Originally Posted by mhb100

Also checked the prop I had on my Bf90 that rowed skiers fine. It was a laser stainless 20'.Attachment 122154Attachment 122155 confident props not your problem.

Bear in mind that the Laser II is a vented prop so gives you the best of both worlds.... A bit of slip a low speed to let the revs come up and the hydraulic effect stopping it venting a planing speeds means you can still go for the optimum pitch for top speed.

[beamishken]

Must be a Honda issue across the range the two 50s I did, one already had the anti tamper caps taken off the mixture screws the other I had to remove them but once I had the carbs fully cleaned and adjusted the idle mixtures the engines ran satisfactorily.
A friend of mine used to be a Honda agent and he fitted a 50 to a boat and it had the problem from day one after a lot of time and effort, new carbs altered set up etc Honda eventually gave the customer a new engine under warranty which cured the problem. So maybe some engines are different out of the box.
A vented stainless prop like the laser 11 mentioned would probably help as it induces some slip to allow the engine to spin up I'm surprised the article didn't suggest that rather than mention the standard ally prop allowed some slip.
You may find a smaller prop that allows the engine to rev out further will make little difference to max speed at wot.
People mistakenly think that an engine held back from higher revs is better off than a one that is free to rev to it's max when actually the opposite is true

[totallydave]

Originally Posted by mhb100

Also checked the prop I had on my Bf90 that rowed skiers fine. It was a laser stainless 20'.Attachment 122154Attachment 122155 confident props not your problem.

mhb100 - tried to PM you about maybe borrowing the prop but not sure you are getting the messages. Try to PM me and we can exchange email addresses.