90 HP Merc Sport Jet Ques

[kenimpzoom]

Have 94 Sea Rayder with 90 HP Merc Sport Jet and have a few questions.<br /><br />1) Does this engine charge the battery?<br />2) What kind of fuel consumption should I expect?<br />3) Does fogging the outside of the engine with WD-40 cause any harm. I do this to prevent corrosion.<br /><br />Concerning fuel use, I get about 1 hour continuous use at WOT with a full tank of gas (16 gallons). I get about 2 hours with normal slow/fast use.<br /><br />Thanks, Ken

 

[jasonnb]

Re: 90 HP Merc Sport Jet Ques

Ken, I'm a outboard guy, but I'll take an educated guess until someone else shows up. I would say:<br /><br />1. Yes it charges the battery<br /><br />2. The rule of thumb for outboards is 1 gallon per 10hp per hour. My old Johnson V4 crossflow burns about 7-8 gal hour at cruise (3/4 throttle) I've been told that jets aren't as effecient, so I would think that your milage would be a bit less, but 16 gal every 2 hours seems way high to me, but I'ne never seen the engine you have.<br /><br />3. I spray the powerhead of my OB (which I think is what your powerhead is, an OB head on a jet) with silicon lube every so often as it isn't as flammable as WD-40, but the WD-40 won't hurt the motor unless you really soak the electrical connections and such. You can get the silicon lube most anywhere, Wal-mart, NAPA, etc. <br /><br />Hope this helps until someone corrects me or fills in the blanks.

 

[kenimpzoom]

Re: 90 HP Merc Sport Jet Ques

Thanks for the input.<br /><br />I have another question. Does this engine have a water pump or is it cooled via the jet drive.<br /><br />Ken

 

[jasonnb]

Re: 90 HP Merc Sport Jet Ques

Of that I haven't a clue. I would "think" there is a pump somewhere, but I couldn't even begin to guess where it would be.

 

[ODDD1]

Re: 90 HP Merc Sport Jet Ques

Yes, Ken.. it is cooled by water diverted from the jet drive....16 gal an hour does seem a little high, but these things are way thistier than a 90 outboard....

 

[SB]

Re: 90 HP Merc Sport Jet Ques

Yes, that is about what my Sport Jet 90 burns at WOT. I have found that if I reduce the speed a little I can get better mileage. Last time out I got about 1.8 mpg, according to my GPS, but this was mainly at WOT.<br /><br />Scott