09-04-2009, 03:45 PM
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| PWCToday.com Is My Home Away From Home
Join Date: Jun 2008 Location: Glendora California
Posts: 4,076
| Re: Hi Bill, FlyWheel Q's ? ?
There are two basic mag flywheels that will work on 587,657,657X, and 720 engnes.`
All of one style fit all engines except the 657X engines, and pre 1992 587 engines.
As the Nippendso numbers are the only numbers on the flywheels, and the fact that there is no way to cross referecne those numbers to oem part numbers, the only way to use a numbering system is to have a pile of flywheels, marked as to which engine they came off of, then have a written index of the numbers so that you could check the list to ID the type of flywheel that you are holding in your hand.
At one time, many years ago, I knew which numbers worked on which engines, but since them, dementia and the loss of my written list has left me with the old tried and true reasoning approach to figurgng it out When in doubt, but even that requires that you have both types in yout possesion.
The magnets are positioned in conjunction with the keyway for any given type of flywheel. Using a straigth edge placed across the centerline of the keyway to the oppositie side of the flyheel on the magnet side, you can see that on one flywheel, the magnets are several degrees offset from the magnets on the other model flywheel. Another method is to use your RV degree wheel centered on the tapered hole with the zero centerented on the key way. Then see how many degrees it is to the first magnet edge. Write that down. Then pick another flywheel and do the same, write it down. If the degrees are different from the keyway to the first magnet, you have two different flywheels in your possesion. You have the basis to form a book on which will fit which engine. Now you can start writhing down the Nippendenso numbers that correlate with the magnet off set in relationship to where the keyway is located.
This is a good job for Sea Doo Source, a frequient poster on the Sea Doo site here that seems to love lists and has long cold wintersin Ohio.
All yellow motors and some 657X motors use a 5 wire stator. One of the two flywheel types will work on all of those motors, because they all have 5 wire stators, with the exception of a few 657X powered GTX''s and SPX's built in 1995. ( all 1994 XP's are 5 wire stators ).
As all white 587; 657's ( except some of the the X motors ) and all 720 motors, use the same flywheel that goes with a 4 wire stator.
I hope you are not totally confused now. If you have a flywheel that youre unsure of, bolt it on. If the motor starts up and runs, you have the right flywheel. If it struggles to start, backfires and f -arts and will not rev up and run good, you have the wrong flyweel. You do not need to install the mag cover to fire up an engine so it is not difficult to swap them if they are worng if you have the oen flywheel puller tool. This is what I call a "last resort" type of way to figure it out.
The best thing to do when disassembling engines is write down the engine type it came off of right on the part with a magic marker. If it comes from a 657X, write 657X on the flywheel.
All back flyweels are for 5 wire stators. White flyheels fit 657, 657x, and older 720's. All unpainted flywheels are replacement oem flywheels because they did not paint them at all.
The only Nimpendenso numbers that count for ID'ing are the big ones like 7000, 7001, 8004 or any other 4 number sequience that is in bold numbers stamped on the flywheels.
I often wish I have made a numerical record and kept it in a safe place.
An RV degree wheels works pretty good if you have a brain on top of your shoulders and something known to compare it too.
Last edited by Mr. Bill; 09-04-2009 at 03:55 PM.
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