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Thread: Weird stuff. Very weird stuff.

  1. #1
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    13th February 2004 - 06:46
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    Weird stuff. Very weird stuff.

    Here's a bit of a queer one for you electrical gurus on here. It's got me fucked, Drew will find the issue but he might have to pull the entire loom to bits to sort it. Someone may have an idea that hasn't occurred to us muppets.

    A bike is (electrically) running fine. Everything works except the neutral light on the dash which is of no major concern and the indicator fuse is blown. Engine and fairings are removed from the bike to fix a completely unelectrical problem which takes 18 months, in this time the bike sits (engineless) uncovered in the rain. Bike is repaired and reassembled, indicator fuse is replaced because no indicators is a pain in the arse.

    Upon turning the key on, indicator fuse blows instantly. Check indicator wiring for shorts and can't find a damn thing. Finally trace fault back to the temp gauge in the dash (WTF?) so this is removed and isolated from the equation. No more fuse blowing and miraculously, the neutral light now works just fine. (WTFF?) So it's riding time. Everything works great (no tempo gauge) but the bike feels a little out of tune. Hunting a little on very light throttle in top gear and feels a bit woolly on acceleration up to mid revs. Other than that, it's fine.

    Now it gets weird. Upon serious load (top gear, 3/4 throttle, mid rev range), the bike gives a complete ignition failure for a nano second (feels like a big miss), blows the indicator fuse, and the dash (rev counter and warning lights) goes dead. However, the "out of tune running" completely disappears. (WTFFF?) This is getting strange. Bear in mind the indicator fuse was previously blown but the dash worked fine with the exception of the neutral light.

    So logic tells us, that the dash is the problem and it's all our own fault for leaving it to fill with water in Newlands for 18 months, right?

    Well last night we completely unplug the dash, removing all power and replace the fuse. This will be sweet, we're clever bastards we tell ourselves over four Steinlagers. Hmmmmm, riding to work today, "out of tune" is back and upon a big wind up on a private closed road, *miss/backfire*, no indicators. Bike feels mint again though.

    We're going to have to strip that fucken loom aren't we……..
    Vote David Bain for MNZ president

  2. #2
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    Bike feels mint .... go with hand signals and leave the electro gremlins in the little box.

  3. #3
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    Quote Originally Posted by Bald Eagle View Post
    Bike feels mint .... go with hand signals and leave the electro gremlins in the little box.
    I'm with you, but it's Drews bike and he doesn't like having shit semi sorted. It also makes it almost impossible to renew the warrant.
    Vote David Bain for MNZ president

  4. #4
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    31st July 2008 - 12:29
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    Bike model and year?

    If the temp gauge is Transducer type which gives signal to CDI/ECU then it may be running cold/hot/limp maps for ign/fuel. Did u test the temp sensor?

  5. #5
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    Quote Originally Posted by Juzz976 View Post
    Bike model and year?

    If the temp gauge is Transducer type which gives signal to CDI/ECU then it may be running cold/hot/limp maps for ign/fuel. Did u test the temp sensor?
    Aha! A smarter man than us, just as I'd hoped.

    It's a mid/late nineties RF900. Being carburetted I wouldn't have thought it would have such gadgetry.
    Vote David Bain for MNZ president

  6. #6
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    Well known for corrosion problems around plugs 2+3. My old GSXR1100 (same basic engine) would cut in and out on number 3. New plug cap fixed it. Didn't pop fuses and shit tho.
    Do you realise how many holes there could be if people would just take the time to take the dirt out of them?

  7. #7
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    Quote Originally Posted by White trash View Post
    Aha! A smarter man than us, just as I'd hoped.

    It's a mid/late nineties RF900. Being carburetted I wouldn't have thought it would have such gadgetry.
    Most likely not, although it may set ignition advance/retard.

    will look at wiring diagram if I can find 1 and I'll have an opinion.

  8. #8
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    Quote Originally Posted by MSTRS View Post
    Well known for corrosion problems around plugs 2+3. My old GSXR1100 (same basic engine) would cut in and out on number 3. New plug cap fixed it. Didn't pop fuses and shit tho.
    Nah. It's nothing like that. When it "misses" it drops all four. It's a complete momentary ignition loss. I'm thinking a CDI wire or perhaps coil wires are bridiging with an indicator wire. But that doesn't explain why the fucking dash now goes dead on the indicator fuse where it never used to. Arrrgghh, I hate electrical shit.
    Vote David Bain for MNZ president

  9. #9
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    Quote Originally Posted by Juzz976 View Post
    Most likely not, although it may set ignition advance/retard.

    will look at wiring diagram if I can find 1 and I'll have an opinion.
    Awesome, that'd be very much appreciated because I'm about to tear my receding hairline to bits.
    Vote David Bain for MNZ president

  10. #10
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    It's not something like 2 circuits sharing a bad earth?
    Last edited by MSTRS; 9th September 2010 at 14:59.
    Do you realise how many holes there could be if people would just take the time to take the dirt out of them?

  11. #11
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    Check wiring associated with oil level sw + lamp, side stand switch, fuel level switch + Lamp.

    as you said its on high load it may be oil or fuel level switch operation due to front of bike being raised. Never ridden an RF which is a shame because you can tell what kind of sensors are used, an oil lamp is generally a switch where as a fuel sensor can be complicated.
    I noticed the TL had a trickery 1 that flashed intermittantly.

    If only you could use my DC clamp ammeter, youd have it sussed pretty quick as you'd see where the fault current is going as it seems to be in a permanent state of fault and when additional load is applyed blowing the fuse. unless the fault current is close to the fuse rating and its slow thermal tripping.

    Might have to ask suzuki if they would like me to teach them to draw schematics properly.

  12. #12
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    Quote Originally Posted by Juzz976 View Post
    Check wiring associated with oil level sw + lamp, side stand switch, fuel level switch + Lamp.

    as you said its on high load it may be oil or fuel level switch operation due to front of bike being raised. Never ridden an RF which is a shame because you can tell what kind of sensors are used, an oil lamp is generally a switch where as a fuel sensor can be complicated.
    I noticed the TL had a trickery 1 that flashed intermittantly.

    If only you could use my DC clamp ammeter, youd have it sussed pretty quick as you'd see where the fault current is going as it seems to be in a permanent state of fault and when additional load is applyed blowing the fuse. unless the fault current is close to the fuse rating and its slow thermal tripping.

    Might have to ask suzuki if they would like me to teach them to draw schematics properly.
    Cheers dude.

    We'll smash a few Steinlagers tonight going over these poits and report back tomorrow with our findings.

    Jimmy
    Vote David Bain for MNZ president

  13. #13
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    Quote Originally Posted by White trash View Post
    We'll smash a few Steinlagers tonight going over these poits and report back tomorrow with our findings.
    This is probably one of the sources of problems. Hilarious to the observers, but frustrating for the fixers, when pished as newts, they can't figure out the problem
    Quote Originally Posted by Jane Omorogbe from UK MSN on the KTM990SM
    It's barking mad and if it doesn't turn you into a complete loon within half an hour of cocking a leg over the lofty 875mm seat height, I'll eat my Arai.

  14. #14
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    I'll Have another look at the diagram I got and narrow it down for you. Don't wanna have to pull everything apart, especially when sensors are involved unless you have an electronics or instrumentation degree to know if they working or not..

  15. #15
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    Quote Originally Posted by Gremlin View Post
    This is probably one of the sources of problems. Hilarious to the observers, but frustrating for the fixers, when pished as newts, they can't figure out the problem
    Listen here, we're not rookies mate, been doing this for quite some time. Bit of lubrication always make the job go sweeter.
    Vote David Bain for MNZ president

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