Do you have any pix or a link to your interior. Killer looking graphix. 124 mph my guess. Are thoes Lumitec led's on back of transom.

Here is couple of pictures. The lights are SMX150's from Lumishore. They are color change and have a controller for 6 colors, 3 levels of brightness and can rotate colors. They are very bright.
[ATTACH=CONFIG]535712[/ATTACH][ATTACH=CONFIG]535713[/ATTACH][ATTACH=CONFIG]535714[/ATTACH][ATTACH=CONFIG]535715[/ATTACH]

Engines have totally different sound. They are definitely quieter without the compressor noise from idle to 2000rpm. After that both are about the same. Just no chatter. Have not had them above 3500rpm yet. Regarding the smoke too early to tell. Running double oil for breakin and cheap plugs until out of break in.
Will let you know how it works out!

Interesting break-in RPM, Ron. Mercury's scheduled break-in on a 300XS is 3,500 to 5,500 RPM (3/4 throttle), varying the RPM's every few minutes, no idle, for the first 3.5 hours.

I hear ya but all of us do not live on a lake!!! LOL.
It takes me 15min to get to the ocean from the ramp. The seas yesterday were running 2-3's. I did vary the RPM to as high as 4000 but it was getting dark.
That is why I am going to the Keys Sunday so I can run around and not worry about idle speed zones and rough seas.
Even at idle I try and get it around 1500rpm or so.

Hey I've got a lot of hours on 300Xs. You should let a professional break them in for you.

Rings need the cycling of heat and cooling to seat, Sam and I will be glad to make the trip down there and help you out

Ron, this is the sticker that would have been on your X's when new. This break in got me thinking I had one of these in the file.I don't think you have hurt anything just dont stay at any one rpm for more than a couple of minutes, especially idle.

[ATTACH=CONFIG]535795[/ATTACH][ATTACH=CONFIG]535795[/ATTACH]

This operations manual would have come with the motors when new. Note the conflict with the break-in sticker in my prior post. (idle times)[[ATTACH=CONFIG]535796[/ATTACH][ATTACH=CONFIG]535797[/ATTACH]

Flightplan
Thanks so much for the information. I would love to have a set of the original manuals. I have the service manual but it does not have anything regarding break in.
I did see that it until break in is over the ECU limits the motor to max rpm of 5800. I have read some of the guys say it takes about 15hrs to be able to get full throttle rpm. Does your manual say anything about that?
I appreciate you sharing this.
Hope to maybe go out tomorrow if the weather is good.