Super Jet Superjet 650 charging issue

thecahinrat

thecahinrat

Location
chicago
I finally finished my 1991 superjet 650. Nothing changed on ski except; intake grate, scupper, bilge, new fuel filter, new plugs, new foam, new foot holds and paint. I took it out for the first time since I bought it and rode it for about an hour or so, fell off a bunch but overall it ran awesome. At one point I tried to start it and it was struggling to turn over and the battery eventually was too dead to turn the engine over. I tossed the battery on my charger to see if the ski is actually charging or not.

-Any common problems with charging?
-how can I troubleshoot this issue?

Thanks in advance for any help.




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X

X2Kid

Location
Canberra, Australia.
First off you would want to eliminate a failing battery. Can you swap it for another and see if the second battery loses charge?

Secondly I would check the cables. Are they all good? Old and corroded cables could have enough resistance to prevent proper re-charging. Having said that, if it cranks strongly on a fresh battery they are probably OK.

Failing the above you'll have to check your stator to see if your charge coil is doing its job.
 
S

SimonSimon

Location
Michigan
Maybe fuel delivery? I had a similar issue when I cleaned out my fuel filter. Engine would crank without turning over till the battery died. I ended up putting the battery on boost charge for like 15 minutes then dumped some fuel directly down carb and it fired right up.
 
Tyler Zane

Tyler Zane

Open Your Eyes
Location
Panama City Beach, FL
Man if your falling off a lot it could just be the constant restarting. Ive done some testing and found it take up to 15 min to replenish a battery after cranking, depending on battery condition.

Check dc voltage at battery while running. Should be around 13-14 volts at idle or just above. I always check for ac voltage also to make sure there isnt stray ac current going into the battery. A bad regulator/rectifier blew up a battery in my ski once, not a pretty sight.
 
augustaf

augustaf

Location
central florida
Even an inexpensive voltmeter from Harbor Freight could check your system. Battery voltage (depending on model) at rest would be about 12.7 if good and fully charged, 11.7 if discharged, 12.2 if sort of half discharged (or just old). You should hook up your meter, read voltage, then start and run it, at least at high idle +, to see if voltage rises slowly. You would have to run it prob. for several minutes with water to see if voltage goes above 13+, - indicating a good charging system.
 
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mbrick

mbrick

Location
Los Gatos, CA
Others have mentioned wiring... absolutely worth looking at. 25 year old high current wires can increase in resistance and not give the starter the juice it needs. They can also be broken just behind the terminal lugs under the insulation making it hard to notice. I've seen a few people find that was the issue.

How old is your battery and what brand/model? Swap for a known good battery if yours is questionable in age or condition.

Then check battery resting voltage and then voltage while running at a minute or so of high idle and report back with the DC voltages.

After that, I would follow the service manual procedure for "Charging System" on page 7-11 and 7-12. Screenshot below so you can check your coil and reg/rectifier.

Even when I wipe out continuously with back to back starting, I've never had it not turn the engine over. I'm using a good full size AGM.

Page 7-12.PNG
 
mbrick

mbrick

Location
Los Gatos, CA
Well then, I think he owes us a photo of the fire.

I replied because there were no details for testing the charging system. If he did already burn it down, maybe the next person will use search and find some useful info.
 
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