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Discussion Starter #1
I decide to go for a ride today (beautiful day). Bike is purring like a kitten and decide I need to fill up with gas before I get to far along. I fill the tank and start the engine... POW!!.. loud backfire. It's never done that before and I really didn't think to much of it. I take off and start to pull onto the interstate when the bike starts to cut out. YIKES..bad place to lose power. Anyway I pull over because the bike is fixing to quit running. No ignition light, neutral light, nothing, no electrics. Turn off the ignition and let the bike sit for a couple of minutes, turn the key back on and it starts right up. Drive for about 2 blocks on the shoulder of the interstate and it quits again. I push it about 2 blocks to get it off the road into another gas station. Again I let it sit, take the seat off and check the battery connections, fine. Turn the ignition on once again and it fires right up. I've got my fingers crossed that it will at least run until I can get it back to the house. I take it easy for a few blocks, kinda feeling it out and it keeps running fine. I get a little confidence and decide to go ahead with my ride, no more problems. Does anyone have a clue as to what would cause this?

Oh yeah, as the bike was starting to die the tach was going wild. I don't know if this was a fuel problem or I'm starting to have some sort of electrical issue.

If anyone has experienced this with your bike I'd really like to hear what your problem was.

Thanks for reading and sorry for the long post.

Jim
 

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Think I heard of this before and it turned out to be dirty contacts in the ignition switch. Some have also said not to have a jumble of keys in your ignition but just the single bike key, as the weight of the other keys effects the the strength of the connections. I'd try cleaning it out and checking all your connections from the battery and ground to the wires in the headlight shell.
Am assuming you have a MF AGM type battery right?

KM
 

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Discussion Starter #3
Think I heard of this before and it turned out to be dirty contacts in the ignition switch. Some have also said not to have a jumble of keys in your ignition but just the single bike key, as the weight of the other keys effects the the strength of the connections. I'd try cleaning it out and checking all your connections from the battery and ground to the wires in the headlight shell.
Am assuming you have a MF AGM type battery right?

KM
I have only the single bike key in the ignition, no extra keys at all. I believe you may be onto something about the dirty contacts. I'll take a look and see if the contacts are dirty or there is a loose connection somewhere. Thanks for your reply, you've been a big help.
 

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Mine did this a few times when new. Took her back to the Kaw dealeer and they found a stretched wiring harness on the ignition switch. Replaced it and it has been fine since then. Take off the neck covers and wiggle the wires in the harness, also try cranking the bars full left and right. If if sputters or dies figure on pulling the switch and harness for further troubleshooting. according to my dealer this is not an uncommon problen for the 750.
 

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Giggity!
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I had the loosing power & jumping tack (no backfire) a couple of weeks ago actually. It turned out to be simple for me. Loose battery connection. Of all the bolts I check I never thought of that one coming loose. Also If it's nice and snug take off the leads to the battery and clean them real good. My jeep was acting up and it turned out to be corrosion on the battery posts. I guess even maintenance free batteries should have a little maintenance! lol:motorcycl
 

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Now what
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I thought I had gotten bad gas because the bike started to run rough, tachometer started pegging pass the red zone and dropping to nothing. Then a loud back fire and she died. My problem was a loose ground cable on the battery. Tightened it up and away we went.
 

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Discussion Starter #7
I thought I had gotten bad gas because the bike started to run rough, tachometer started pegging pass the red zone and dropping to nothing. Then a loud back fire and she died. My problem was a loose ground cable on the battery. Tightened it up and away we went.
Bad gas was my initial thought also. I checked and couldn't find any loose connections anywhere. I went for about a 75 mile ride today and the bike ran great.

Is it possible that one or both of the carbs flooded when I started the bike (causing the backfire) and as I was pouring the coal to it to get up speed some sort of sensor shut the engine down. Sorta like the KILL ENGINE switch would operate? I know this sounds kinda nuts but is it a possibility? It just seems odd that this happened right after I filled the tank with gas.

Anyway I hope it doesn't happen again as I'm sure some of you know it's no fun being stranded with a bike that won't run. :doh:
 

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When I first got basketcase running I had the same problem. Check the 30 amp fuse connection in the fuse box. Mine was loose so I would lose power to the coils. Check it out, you might get lucky
 

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If your Tach needle was jumping around, and it is cutting out, it is definitely your ignition switch. I had the very same problem about four years ago and as it only gets worse, I had my ignition switch replaced.

Stevie D.
Chicago
 

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Discussion Starter #11
If your Tach needle was jumping around, and it is cutting out, it is definitely your ignition switch. I had the very same problem about four years ago and as it only gets worse, I had my ignition switch replaced.

Stevie D.
Chicago
Did you replace it yourself or have someone else do it? If it wasn't to expensive I'd opt to have someone else do it unless it is a pretty easy fix. I'm not a wrench so it would have to be a pretty easy fix for me to try it, don't want to make it worse.

Thanks
 

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that jumping tach issue was also present on mine before i discovered the loose fuse
 

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I had my local dealer do it, I don't recall what it cost me, but the price on the switch from Ron Ayers is $72.18, so I am thinking they probably charged me double that to install it. You will have a new key for your ignition and the gas cap will still use the old key......

Stevie D.
Chicago
 

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Discussion Starter #14
I thought I had gotten bad gas because the bike started to run rough, tachometer started pegging pass the red zone and dropping to nothing. Then a loud back fire and she died. My problem was a loose ground cable on the battery. Tightened it up and away we went.
I just came in from changing the oil on my bike a few minutes ago. As luck would have it when I tried to start the bike after the oil change, nothing! Just like on the interstate the other day. At least I was home and in my garage.:D

I decided to check the battery cables again. They seemed tight but I went ahead and loosened them up, wiggled them around abit and tightened 'em up real good. The bike fired right up. I'm keeping my fingers crossed that it was just a bad connection.

Thanks very much for all the helpful advice I received from you guys. This is a great forum. :beerchug:
 

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You might try putting a little dielectric grease on the battery leads - that may help with the connection if it's fragile. Also, I have a spare ignition switch - needs a ground wire soldered back on, but if you find that's your trouble, give a shout. It's a pretty easy fix (and I can even do the soldering and send it to you).
 

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Discussion Starter #16
You might try putting a little dielectric grease on the battery leads - that may help with the connection if it's fragile. Also, I have a spare ignition switch - needs a ground wire soldered back on, but if you find that's your trouble, give a shout. It's a pretty easy fix (and I can even do the soldering and send it to you).
Thanks for the info and I really appreciate your generosity. If by chance it does turn out to be the ignition switch I'll give you a shout. Thanks again :smiley_th
 

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You might want to check those battery cables this weekend and see if they are a little frayed by the connectors. Could be you have a cable going bad or hopefully it was just a dirty connection and taking them off and reattaching fixed that.
 

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Benjammin'
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If messing with the battery connections seemed to produce results, you may want to look at the other end that is connected to the bike's frame for corrosion. You may have jiggled it just enough to make contact.

I took all my ground cables off and sanded/cleaned both the connector and the frame surfaces to make sure they were clean to make better contact.

Good luck!
 

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Discussion Starter #19
If messing with the battery connections seemed to produce results, you may want to look at the other end that is connected to the bike's frame for corrosion. You may have jiggled it just enough to make contact.

I took all my ground cables off and sanded/cleaned both the connector and the frame surfaces to make sure they were clean to make better contact.

Good luck!
Great idea, Thanks!
 
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