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Outboard Technical Discussion This is our outboard engine related technical discussion forum. Topics include engine repair and maintenance, modifications, gearcases, electrical and electronics, etc. For technical assistance related to topics not outboard related please use our other Engine forum.

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Old 08-04-2018, 11:16 AM   #1
Gofaster
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Default 2.5 xri keeps destroying flywheel.

95 xri carbed , 5800 26 3 blade chopper. 87 starflite fresh core ,stringers, floors,no foam at all , 12" setback


I keep breaking the 40 am cast wheel and it is time to get rid of weight, before top of crank comes off. I like the batteries charged . will a 16 amp keep up ? boat is a river boat , lights, radio electric fuel pump,
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Old 08-04-2018, 10:05 PM   #2
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How is it 'breaking'? Stock wheel will be good to mid 6000's. I've regularly spun mine to the 6800's with never a complaint, although it is on a jet drive. If you're going to see North of 7000 I might consider an aluminum one. If I remember correctly, you can go with a 2.4 16 amp with it's corresponding stator, shorter screws and a little wiring to save some weight. My first thought was is the pinion vibrating up into partial engagement and wreaking havoc on the ring gear or are you exploding the flywheel with high rpms.
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Old 08-05-2018, 11:17 AM   #3
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It keeps knocking the teeth out of the center. Have been looking for an aluminum one for a while.
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Old 08-05-2018, 11:35 AM   #4
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If we are talking about the 'teeth' on the outer circumference of the flywheel, look at possible starter operation when it shouldn't be, also sticking, and such. If it is the magnets coming loose underneath the flywheel, dont strike flywheel when removing it and check clearance on stator and top bearing.
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Old 08-06-2018, 02:19 PM   #5
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The teeth that hold the flywhe to the crank
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Old 08-06-2018, 06:31 PM   #6
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Oh. Not sure what to make of that. If the splines on the end of the crankshaft are damaged in some way, I'm guessing that you are not going to have a good day.
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Old 08-07-2018, 03:24 PM   #7
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It has not damaged splines on crank. Looking for a aluminum 40 amp flywheel
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Old 08-07-2018, 04:48 PM   #8
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Check out 'Dryland Marine' Might be what you're looking for.
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Old 08-08-2018, 10:26 AM   #9
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Yes sir, that is unfortunately that is a 16 amp
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Old 08-08-2018, 10:25 PM   #10
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Have you used a dial indicator on the splined shaft? Just a outside chance that it may not be straight (bent or out of round). If it is out there is the possibility it's creating a vibration causing a self destruct scenario.
You have nothing to lose by checking.
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