Our Speedster 150 215 HP SC has been winterized and stored for the season. There have been excellent guides to winterizing:
I thought a little more information would be helpful - I know I would have appreciated it.
Use the guidelines (see the links above) for changing the oil and other winterizing steps. The one that frustrated me was the intercooler.
The service manual says to disconnect the two hoses to the intercooler, drain it, and add FULL-STRENGTH antifreeze to the intercooler and exhaust manifold. The intercooler is on the engine facing the bow, practically under the lip supporting the engine cover. There are other hoses and wiring harnesses over it, so it's Almost impossible to get at -- I almost gave up. Once I found a better approach, it was much easier. Do not try to get to the intercooler from kneeling on the seats, headfirst down into the engine compartment.
1) Stand on a sturdy stepstool from the side of the boat behind the driver's seat.
2) Remove the hard kinda rectangular plastic air duct from the bottom of the engine compartment.
3) That will allow access to the intercooler hose clamps from the side. Loosen them and remove the hoses from the nipples.
4) The manual says to let the intercooler drain. Mine seemed to drain only a few drops. I ended up tilting the boat slightly by setting the trailer tongue and coupler on the ground, not propped up. The water (such as it is) will drain into the bilge.
5) Reinstall the lower intercooler hose and clamp.
5) The manual says to put full-strength antifreeze into the intercooler (approximately 200 ml or 6.76 oz.). However, with both intake and outlet nipples angled down, this was a challenge, too. I used a small diameter flexible tube to feed up the nipple and into the intercooler. I appropriated an old-fashioned squeeze bottle like a 1950-1960's diner might use for ketchup or mustard that comes to a point, and marked off the ounces on it. I put in 7 ounces of antifreeze, and fed that into the intercooler through the tube.
6) The manual says to put approximately 300 ml (10.14 ounces) antifreeze into the exhaust manifold. Using the same squeeze bottle with slightly more than 10 oz antifreeze, I put that into the hose soon to be reconnected to the upper intercooler nipple, that led to the exhaust manifold.
7) Reconnect that hose to the upper intercooler nipple, and tighten the hose clamp.
8) Replace the hard plastic air duct.
If someone more knowledgeable thinks this might not be adequate, please let me know so I can re-do before the weather gets to 20 below.
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