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86 Bayou 300 magneto magnets

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  #1  
Old 11-04-2018, 07:29 PM
Weekend Warrior
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Default 86 Bayou 300 magneto magnets

Hi all,
I have an 86 KLF300A with shattered magnets in the magneto. Looking for options before scrapping the ATV as it is/was a good running quad in excellent condition. I have seen aftermarket magnetos for arctic cat that resolve the weakness with the old design in their models, does anyone know of an interchange magneto that would fit the KLF300A motor? I know there are used magnetos available but they are not in my budget. Thanks all.
 
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  #2  
Old 11-04-2018, 09:31 PM
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So sorry about the broken magnets!

I have an old '86 KLF300A like yours, and I love it. I restored it from being a basket case and I had no idea that the
flywheels were so expensive. I paid less for it that the cost of a used flywheel! The rear differential makes it nearly
unique and wonderful.

Are all the magnets damaged? I wonder if there are magnets that you can buy and epoxy in as replacements. Or
maybe remove all the magnets and figure out a way to install an external alternator. That is commonly done on
old Goldwings when the stators go bad.
 
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  #3  
Old 11-05-2018, 09:38 AM
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All the magnets were damaged in some way. I've seen on the newer designs there is a metal ring fitted in that holds the magnets in place as well as the epoxy, a more permanent fix. I guess since this particular flywheel/magneto was only used for 2 years the aftermarket never developed for it. I am not surprised that I cannot find replacement magnets, since they would have to be curved, and curved in opposite directions to correspond to north and south, and curved to fit a certain size circle at that. . I am going to look into doing an external alternator, that is a good idea, thank you! On yours, do you just hope that the magnets on the replacement never fail like the original? The going rate on a used one right now is about $500 i cannot justify that cost for something that might have the same problem shortly.
I do love my bayou, I agree the differential really sets it apart.
 
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  #4  
Old 11-05-2018, 11:54 AM
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Yeah, the 86-87 KLF300As where unique. The Bs and Cs are different, as you know. I wonder how much different the B flywheels are. $500 is crazy money for a flywheel, tho some go for half that on eBay. Still too much, IMO.

There was an optional pull-starter on the As, but mine does not have it. It makes a convenient PTO to drive external devices, either directly, or with a pulley. I have seen it used to drive a hydraulic pump on a big quad.
 
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  #5  
Old 11-06-2018, 03:00 AM
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Looks like it is DC ignition same as the later ones, so only needs a signal from the trigger coil on the outside of the flywheel to spark. If it still gets one with no magnets inside, I would run it without the magnets. It won't charge the battery, but as long as the flywheel is still balanced, all you need are two batteries, one on charge at home, and one on the bike, once the starter slows, you swap batteries. Not suitable for all applications, but unless you need lights, one battery would probably last a day or so. Old KLF 300s don't seem to make much money, so there should be scrap engines about for fairly low prices. You could keep a lookout for one, then swap the whole engine.
 
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  #6  
Old 11-06-2018, 10:03 AM
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Yes, and I think my trigger will be ok once I get all the magnet off of it. Just waiting on a flywheel tool to get it off so I can fix the starter clutch that is probably full of magnet also. I like your idea merryman I mostly ride during the day anyway. I'll try firing it up once I get the starter engaging again.
 
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  #7  
Old 11-06-2018, 11:26 AM
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Yeah, you can see the pickup coil on the left side of the photo I posted.

If you can get your hands on a flywheel from a KLF300B, it may actually fit. The photos do not show a clear
difference, and they can be had for under $60.

The battery in these old Kawasakis is huge (18Ah), so it should run your ignition for a long time, I will bet. Not
so long if the quad is hard to start.

The KLF300 As and Bs are unique and valuable in that the rear diff allows driving the quad safely on pavement as well as dirt, and the
turning radius is fantastic.

Another unique thing about the As (86 and 87) is the crappy steel fuel tank. They went to plastic for the Bs as the
steel one rusts out. I sold my rusty one on eBay for $80 (!) and fabbed up a stainless steel one.
 
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  #8  
Old 11-06-2018, 12:27 PM
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I am planning to get my hands on a 300B flywheel and i'll at least try. I agree, the 300A has the biggest battery of all our atvs and it takes almost nothing to run ignition. Starter chain is stretched out too, could be what knocked all the magnets loose. Did you change out your starter chain as well sr?
 
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  #9  
Old 11-06-2018, 01:56 PM
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Originally Posted by chipskittles View Post
I am planning to get my hands on a 300B flywheel and i'll at least try. I agree, the 300A has the biggest battery of all our atvs and it takes almost nothing to run ignition. Starter chain is stretched out too, could be what knocked all the magnets loose. Did you change out your starter chain as well sr?
Let us know if the flywheel is close enough to mount and work.

I did not change the starter or drive mech. Mine worked fine. What I DID need was fuel tank, new piston/rings, new carb. Spent many hours getting
carb to work right. It is an earlier generation of the large Chinese replacements ($80). I f-ed up my original carb trying to get the corroded pilot screw out. It
broke inside the casting and I failed in drilling it out. I shoulda used heat.

I don't know why the rotor magnets come loose. I have not seen that problem before. Old decayed epoxy, I suspect. Maybe infrequent oil changes
damage the epoxy? Just guessing here.

 
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  #10  
Old 11-06-2018, 03:37 PM
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Amazingly I have not had to change the carb yet. Gas tank is shiny inside if you didn't know better you would see it and think it was a 2000s model. Best of all it hasn't been "modified" by previous owners lol
 
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