G3 X22 DLX - Yamaha 115 - Speed?

[Venturous]

Hello,

Shopping for new pontoon. We found a left over 2015 G3 X22 DLX with a Yamaha 115 4 stroke.

According to specs, top speed should be somewhere near 27mph for this boat/engine combo.

But, doing two test rides, best we could get was 19mph. They changed to a SS prop but even then could only see 20mph. Now it is sitting in water and does have dirty toons so I don't expect to see 27mph... but 20 seems a bit low. All speeds checked with GPS, not speedo.

I'm not looking for a race boat, but concerned the difference between performance charts and actual could be a sign of something not right with this engine, even though brand new.

Does anyone have this combination who can provide input on what speeds you normally see?

[slingshot]

Look at "performance thread anyone". Perhaps you could provide your current WOT rpm and type of prop

[Bamaman]

I didn't look up that hull on line, but I assume it's not a tritoon? Does it have lifting strakes?

My old Starcraft with 115 hp 2 stroke Yamaha was about 30 mph. That sounds pretty slow for 115 hp.

[ROLAND]

check the pitch on the prop... I changed props a few years back, went with a different pitch and ended up being over propped... went back to the original and all was good again.. Just one thing to look at because a 115 on a 22 footer should get you better than 20mph. I've got a 75 on a 20 footer and I top out around 22 - 23 mph.

[Soonertoon]

I have a G3 Suncatcher 22 ft with 115 FB Yamaha. SS 13.5 X 12 p prop. Two toons, no strakes. Four people , half tank fuel, Bimini up, glassy water and no wind...27 m.ph. Wide ass open. No underskinning either.
It's a barge, not a speedboat. Works for me as I spend 90% of time cruising at around 16 mph. Would be nice to have a few more clicks out of it but there's too many factors involved that effect these things speed ability.

[Venturous]

[quote]I have a G3 Suncatcher 22 ft with 115 FB Yamaha. SS 13.5 X 12 p prop. Two toons, no strakes. Four people , half tank fuel, Bimini up, glassy water and no wind...27 m.ph. Wide ass open. No underskinning either. [/quote]

That is what we were expecting and I would be more than happy with what you posted.

From some more digging... we now suspect they have the motor mounted in the wrong hole. In other words... engine is sitting too low in water. Dealer is going to adjust tomorrow to see if moving the engine up makes difference.

Do you know what hole your 115 is mounted to boat with? There are 4 holes on the engine where the top bolt can be put in to mount the engine. Is yours using top hole, bottom hole, second from bottom or what? Just curious. Don't go to too much trouble if you don't know.

[ron nh]

Some of theses dealers really are morons, I assume it's been in the water before, maybe not, but you'd think they'd check the setup before hand. It's definitely slow.

[mikeb33]

I just bought a 2008 Sweetwater 2386 2 toon with a 2008(I assume) Yamaha 115 4 stroke. First time I drove it we could only hit 20 mph at 3,800 rpm. He had a Quicksilver 17P stainless prop on there, but gave me the original Yamaha aluminum 13 1/2" 15P. The next day I swapped them on now it goes 27 mph at 6,000 rpm. Both times fairly calm, 2 adults, not much else.
A different brand and style and a slight pitch change can make a huge difference. For that motor and boat, a stock Yamaha 13.5" 15P may be the perfect choice.

[Venturous]

Dealer raised outboard one bolt hole and viola... I tested it today and hot 30mph GPS... so we bought it. Thanks for all the info!

[Bugsbunnyboater]

Glad it worked out. Have a ton of fun on it.

[Soonertoon]

[quote="Venturous"][quote]I have a G3 Suncatcher 22 ft with 115 FB Yamaha. SS 13.5 X 12 p prop. Two toons, no strakes. Four people , half tank fuel, Bimini up, glassy water and no wind...27 m.ph. Wide ass open. No underskinning either. [/quote]

That is what we were expecting and I would be more than happy with what you posted.

From some more digging... we now suspect they have the motor mounted in the wrong hole. In other words... engine is sitting too low in water. Dealer is going to adjust tomorrow to see if moving the engine up makes difference.

Do you know what hole your 115 is mounted to boat with? There are 4 holes on the engine where the top bolt can be put in to mount the engine. Is yours using top hole, bottom hole, second from bottom or what? Just curious. Don't go to too much trouble if you don't know.[/quote]

Good catch. In fact, mine was too low from the factory. They had it setting in the bottom hole for Christ sake/ Puking water big time back into the open section on the transom. At WOT, the water was coming up past the level of the motor cover gasket! I raised it to the third hole form the bottom. that ended up being too high as no trim ability before blowout. Now it is set in the next hole up from the bottom and seems to be where it needs to be. It was a helluva lot less water puking , improved speed and MUCH easier to steer.
I called the factory in this process and asked tem what the basis was for the low mounting. Come to find out, they set the motor heights for the two log and three log boats at the same height. Remember, a three log with strakes is gong to rise much higher in the water once on plane and they need the lower mounting position. Unfortunately it seems they are sacrificing the correct two log set up for simplicity sake on the assembly line. I ripped their asses for being morons ( made me feel better) and called it a day.
Hopefully this helps you

[Soonertoon]

Also, Im curious. What exact prop are you running; diameter, Pitch , Cup etc.

[Venturous]

Sorry I dont know. They had an aluminum on to start but threw in a SS prop to getvthe performance I wanted to see. Never looked yet size and pitch. Will try to remember to report back.

[mikeb33]

Why would stainless perform better, if it were the same diameter and pitch as an aluminum prop?

[Venturous]

Beats me. It may have been different size/pitch as well. Thought I remember reading once SS give better hole shot since less flex... but have no idea if it helps top speed. Sure someone here knows that stuff.