This may be a dumb question but what is the right way to do a plug check on the water? Im rejetting my carb and want it to be safe

WOT, then shut down immediately and check the plugs.

Massive amounts of water will run up the back of your boat if you do it that way.

We always used the speed as a guide. Run the boat WOT...check top speed. Next, go up 2 numbers all the way around in jet sizes....run WOT again...check top speed. Keep doing this until the mph starts to drop off..then back the jets down 2 numbers. Should be super close this way.

I kinda like reading the plugs plus a little easier than pulling the bowls off to change jets in the middle of the lake

Like RT930turbo said. WOT then quickly get to idle speed and kill the engine then pull plug. I would also do check at your cruise speed just to be sure.

First thing is knowing exactly what you are looking for when reading the plugs. The fuels today burn very clean and you will see hardly any color, if any, on the porcelain. You want to look at the base circle fo the plug, basically the metal base of the threads. It should have some light carbon and color on it. It should not be a blue color. That is too lean. Also, look at the porcelain with a magnifying glass. Make sure it does not have any gray specs. That to is lean and is caused by detonation.
The best plugs to check are #7 and #2 since they are the farthest away from center and generally are the leanest.

I like to take plug readings at the max rpm when the engine is operating without the secondaries open first. You can mark your throttle base with a piece of tape so you know when you test on the water. It should be around 3800-4000rpms. Run the boat there for 1-2 mins and then come off plane as quickly as possible(without having your wake slam the back of the boat) and turn off the engine. Then check the plugs to see how they look. Once they look good, repeat the same procedure except at WOT. Run maybe 30 seconds once you've reached max rpm.

Stock jets for the 525SC are 98's in all the holes and its on the rich side. If you've got the stock cam, then 98's should still work fine with the smaller pulley or you could bump the secondaries up few sizes to be extra safe.

Thats why I suggested the way I did. You cant go wrong then. Everybody thinks they are a plug reading champion. Most really have no idea what they are looking for. They think "if its a nice tan color...it must be perfect". My idea...was just a suggestion.

+++1,2,3,,,,,

what everybody said...

i do it the same way griff does but when i come off plane i start to put the boat into a turn,then turn the key off then grasp the wheel with both hands and turn the boat into before it stops,,this will put the splash on the side of the boat and their will be lass splash on the back of the boat,,make sure you have some kind of flappers on the exhaust tips,weather they are clamp ons of internal,thease will help prevent the water going into the exhaust..