New to SIBing and after some guidance - Page 3

Wazzajnr · 28 June 2021, 13:28

Yes, one up, if i kneel halfway between the two seats and whack the throttle open, it almost tips me out the back but then is on plane almost instantly.
Didn't check the speed but i would say i was well close to 15mph plus, on a light chop, it was borderline uncomfortable.
With John's setup, he should be able to plane but it does need bulk of the weight forwards.
It seems to me to be more important that weight is removed from the back as a pose to weight being added to the front if that makes sense.
With two big adults and two kids on the front seats, we (The adults) were having to lean almost right over the top of the kids to get over the hump. Once on plane we could sit back on the seat no problem.

A 9.25x8 prop seems to be OK, probably could go up a tad but it's just going to make it even harder to get over the hump and to be honest, it's plenty fast enough!!

that 4 blade needs to go though but it would be worth a try with the motor angle set corectly first to see if there's any improvement.

John McOmie · 28 June 2021, 22:31

https://youtu.be/NgjrsTLZHbY
I managed to do a quick video in response to Wazzas before it went dark, I'm just not sure where the sliding handle should be whilst on the water if you can advise please.

jeffstevens763@g · 28 June 2021, 22:49

From what I remember the bar is the shallow drive and you can either lock the tilt so it doesn’t kick up when reversing or leave it so it does if you hit something when in the lowered position

Wazzajnr · 28 June 2021, 23:15

Once you drop the motor down right into the water (NOT shallow mode) it will be in the locked position which is what you need if you are reversing (lever in lowest position)
Once you are moving forwards, the lever should always be up so that if the skeg hits anything, the engine will pop up rather than wrecking the prop or tearing your transom out.
Newer motors often have this linked to the gear selector

billows · 29 June 2021, 10:33

Quote:

Originally Posted by Fenlander

Oh yes be super careful the leg is supported if you have your fingers anywhere in the tilt/saddle area... if you unexpectedly cause it to drop by accidentally tripping the tilt release lever fingers are at risk.

Good advice , don't ask me how I know. Lucky it was only a 6hp

John McOmie · 04 July 2021, 23:12

Update.... I've found and ordered the correct prop as advised... arriving Friday from the good old USA (free postage on prime saved £12), new Bravo pump purchased, price matching saved me £20, I've got a rev counter and once the props fitted I'll fire up the engine and see what it revs at! The foil is coming off tomorrow and then I'm going to try some trial and error runs to see if we can get on plane minus the dog for now! Thanks for all your help guys. I'll update again after the test runs!

Wazzajnr · 04 July 2021, 23:59

You may find you have to get well forwards to get on plane but can sit back once up although I wouldn't advise any sharp turns on plane.

Fenlander · 05 July 2021, 10:40

Looking forward to hearing the results of these changes... I really hope you get a worthwhile result.

John McOmie · 09 July 2021, 17:11

Quote:

Originally Posted by Wazzajnr

Just had a look online and it seems standard diameter should be 9 1/4" and yours is 10".
Pitch is recommended anything from 7 to 12 and yours is 10.
I would suggest buying a "tinytach" off amazon or ebay and see what rpm the engine is running at on the boat with throttle wide open.
That will give you far more info. The 9.9hp from memory WOT range is 4500 to 5000 which is relatively low so if its propped incorrectly you will never get into that range and it will be bogged all the time.
If you're anywhere near Anglesey this weekend, I'll be trying out my "new to me" evinrude 9.9 so would be happy to chuck it on your boat and see if it performs any different. That said, I've no idea how it will run on mine yet! ��

I've now fitted the new prop and wired up the rev counter which idles around the 3000 mark and then I slowly increased it and it was recording 9700 at nearly full throttle!
I've got to grips with the shallow setting on the tilt and it seems a lot "snugger' to the transom. I was hoping to go to Cardiff bay marina tomorrow but my other half has invited her Mum down for the weekend and at 90 I can't see her wanting to jump in the boat, so it might have to wait a week or so before water trials. I've taken the foil off but will take it along to see performance with and without it. Gutted I can't get out!!! 😡

Wazzajnr · 09 July 2021, 17:38

You have the tach set up wrong.
Idle should be somewhere around 1000 and max revs should be under 6000.
If you really have revved it to almost 10k it's likely to be damaged!

Fenlander · 09 July 2021, 18:54

Yep looks like the tach is set up in the mode that is doubling the actual readings... and your idle is set a bit too fast. Always frustrating when you are poised to try a changed setup and stuff gets in the way.

Wazzajnr · 09 July 2021, 19:38

I'd guess it's reading 3 times to be honest. Anyway, it should be around 1000 at Idle maybe a bit less, especially if it's in gear.
If you video it idling with decent sound might be able to tell if it's idling too fast.
Video idling and putting it into gear both ways. Not going to be an exact science that way but if it's way out, it should be obvious.

Fenlander · 09 July 2021, 20:10

Yep I chucked a coin in the air re the 2x or 3x reading. I have a “laser” Rev counter that picks up an accurate reading from the flywheel and always use it to verify these cheap tach units before using them for tuning or prop selection.

Wazzajnr · 09 July 2021, 20:12

Yes, I have several hand held tachos too for work so I always check mine as the manuals can be a bit wrong!
I can normally tell roughly if I'm at the correct Idle speed so if I'm significantly above or below 1k rpm I try the other settings until it reads a sensible number.