How to Winterize a Jet Ski
Essay Preview: How to Winterize a Jet Ski
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Things I alway carry onboard my PWC: PWC license & registration, copy of insurance, extra money, tools, spark plugs, zip ties, stainless clamps, small syphon, flammable WD-40, oar, extra drain plug, light stick, extra lanyard.
Having trouble starting your PWC? Try installing a primer kit. A primer kit replaces the stock choke cable and plate. A primer allows you to squirt a little gas directly into the carb for easier starting. My PWCs start on the first or second try- EVERYTIME. Thats gotta save your starter some. You also get the benefit of increased airflow by removing the stock choke plates. I recommend a primer kit to everyone. Its cheap ($20) and really works- a must have!
Attention PWC owners with Mikuni carbs – Do you want to know how to properly tune and jet your carbs? If so, then get yourself a copy of the Mikuni watercraft carb owners manual (make sure its the 3/96 revised edition). This manual explains, in great detail, how your carb operates and how to tune it it for top performance. Ive read many tuning guides before, but this manual is the BEST yet. Remember, an improperly tuned or jetted carb could mean a poor performing engine or at worst lead to a seized engine. Dont take just anyones tuning and jetting methods as correct (Beware: there is a lot of poor or incomplete tuning information out there). Get this manual to prove the correctness those methods you may already know. All PWC are shipped from the factory to run at a variety of different altitudes and air densities. Even two of the exact same PWC may have slightly different optimum carb settings because of engine air-tightness and different cylinder sleeve port matching (all factory engines are not equal- Yamaha even rates the cylinder sleeve port matching from 0 to 16 on all their cylinders). Why not precisely dial in your carb for your engine and altitude. You download the manual for free (What a deal!) at:
Here is the BEST tech tip of all: If you dont have the service manual for your PWC, GET IT! Itll be the best $50 youll ever spend on your PWC. The service manual is an invaluable source of information on your specific PWC (make sure you get the manufacturers service manual for your model and year). The service manual has detailed info on: all components on the PWC (engine, pump, electrical, hull, fuel, etc), troubleshooting guide, torque specs, and much more. I wouldnt attempt a repair without it.
Try a roller on the back of your ski trailer. Ive got an 8 inch trailer roller bolted to the back of my trailer between the bunks. The roller will just make contact with the hull when the ski is fully on the trailer. I find that with the roller, I dont need to back my truck and trailer as far into the water (salt water where I live). The ski rolls right off the trailer with little effort. I also dont have to drag the hull across the bunks, scratching the hull. Just lift up the front of the ski and it rolls into the water. You can buy all the parts (roller, roller holder, and bolts) for under $20 at any marina that sells trailer parts. Just make sure that you get a clear roller, a black one will mark up the hull. Also to help get your boat off the trailer, try those new plastic bunk mates or just replace your bunks with plastic lumber. Ive got them on my trailer and they work great. For a really inexpensive way to get your PWC off the trailer, Marc Wilkerson suggests to spray down carpet bunks with silicone spray about every six months.
Prop Repitching and Blueprinting:
Thinking of getting a new prop? Before you do, consider the benefits of repitching your exsisting prop. If you already have a good condition stock or aftermarket stainless prop, you may be able to gain performance and save money by repitching your existing prop. Even new props will benefit from blueprinting the blades and repitching. One reason you would want to repitch a prop is to match it to the machines powerband. Most newer props are progressively pitched meaning that they have a smaller pitch at the props leading edge that transitions to a higher pitch at the props trailing edge. Example- a prop designated 15/18 is 15 degrees at leading edge that transitions to 18 degrees at trailing edge. By repitching, the leading and trailing edge pitches of stock or aftermarket props can be optimized for your particular engine and hull combination. Even if the pitch of your prop is ideal, you could benefit from blueprinting. Most props have three or four blades. Unfortunately, the blades arent all exactly alike, even on a new aftermarket prop. A 15/18 pitch prop might have one 14.5/18 blade, one 14/17 blade, and one 15/18.5 blade. Blueprinting the prop would ensure that all blades have equal pitches.
Optimum pitch:
The trailing edge pitch is adjusted for top end performance based on peak engine RPMs at full throttle under load (pump in water). The optimum trailing edge pitch will limit your machines peak RPMs (not to be confused with a rev limiter – see below) to where your engine makes its peak horsepower. For example, if your engine makes its peak horsepower at 7000 RPM and your machine is showing peak RPM readings of 7200 RPM, you would want to raise the trailing edge pitch on that prop in order to bring RPMs down to 7000. A higher pitch decreases RPMs (takes a bigger bite of water) and a lower pitch raises RPMs (less bite). NOTE: A rev limiter electronically limits an engines RPM to a pre determined point. The rev limiter protects your engine in free rev conditions when the pump comes out of the water (choppy water or wave jumping). Typically the rev limiter is set to 500 or more RPM greater than the engine is capable turning while at full throttle under load (pump in water).
The leading edge pitch is adjusted for low end performance. The optimum leading edge pitch will allow the PWC to accelerate hard and let engine rev up quickly to high RPMs where more horsepower is made. A leading edge that is pitched too high (takes a bigger bite of water) will not let the engine rev up quickly to higher RPMs and acceleration will be sluggish or laboring. A leading edge that is pitched too low (takes a smaller bite of water) will rev up quickly but the prop will spin (or cavitate) causing slow