LC4 Won't start

Discussion in 'Thumpers' started by Supervaca, Jul 22, 2010.

  1. bmwktmbill

    bmwktmbill Traveler

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    5,610
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    I don't think the ring shattered, I think it got hot because it lost water or lost lube, then the ring broke...how's the connecting rod for play, big/small end?

    I'd say the cooling system failed but I could be wrong.
    Often am.
    bill
    #21
  2. 5-0 BAIT

    5-0 BAIT n00b

    Joined:
    Aug 1, 2012
    Oddometer:
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    HONOLULU, HAWAII
    I've got just about the same problem. Only, I've had shops doing all the work for me. When I first brought the bike in, they put in a new spark plug, and cleaned the carbs. Another shop figured out that there wasn't a whole lot of compression. So, they put in a new piston kit, and a new stator. Now it's getting plenty of compression, but still won't start. So, they traced all the wires, and figured out there's no problem there. So, now they've put in a new CDI, and they're putting in new coils. They also said that with the spark plug out, there's sparks flying everywhere. But, when there's compression... no spark, and the plug comes out "wet". It seems like they're on their last leg, and this happens to be the 3rd shop I've taken it to. The first shop said "that's normal, just jump start it." Well, I'm 5' tall, and I can't jump start this thing by myself.

    P.S- it's an '04 KTM LC4 (625 CC) with an aftermarket supermoto electronics kit.

    Any help would be appreciated. I've already spent about $2000!
    #22
  3. gunnerbuck

    gunnerbuck Island Hopper

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    If you have good compression, good spark , reasonably close jetting and the bike still won't start then it is possible that your starter clutch is slipping and possibly not allowing the engine to spin over at a fast enough rate to light the fire with the E button...

    Did you have it running before with the aftermarket Electronics or is this a recent non tested installation?
    #23
  4. MORT666

    MORT666 Been here awhile

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    PUT a yam 660 motor in it.:norton
    #24
  5. achile

    achile Been here awhile

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    Take the front end and put it on a Xr650r :evil
    #25
  6. bmwktmbill

    bmwktmbill Traveler

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    5-0,
    Where are you located, you need to find a good mechanic by the sounds of it or an inmate to help.

    bill
    #26
  7. Beemerboff

    Beemerboff Long timer

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    BMWs had a lot similar problems-some were caused by dud starter and load control relays, some by corrosion on the pins of the relays.
    #27
  8. 5-0 BAIT

    5-0 BAIT n00b

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    Awesome, thanks for the advice guys. I'll check the starter/relays/pins next. I'm in Hawaii (Oahu). So, it's kinda hard to find someone here who knows about LC4's; I've only seen one other on the island, and it belonged to a pilot from Austria who is only here like one week out of the month. lol Also, I've tried all of the good mechanics on the island. So, if the starter isn't the problem, I'm just going to take her home and tinker until she growls right. I'll keep everybody updated on it. Thanks again.
    #28
  9. 5-0 BAIT

    5-0 BAIT n00b

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    To answer Gunner... One of the things the shop did was take all of the aftermarket electronics off, and try it as if it was a straight dirt bike... no dice. One of the strange things is, when I first got the bike, it would crank, weakly, but only if the hot-start was on.
    #29
  10. gunnerbuck

    gunnerbuck Island Hopper

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    The starter clutch sits behind the flywheel on the right side of the engine...
    With the spark plug out there is much less compression drag on the engine so the starter will more easily spin it giving a strong spark... When the plug is in the extra compression drag could be causing this starter clutch to slip, in turn it will not spin the engine fast enough to produce a proper ignition fire to start the engine...

    Here is a thread:http://www.advrider.com/forums/showthread.php?t=222515
    #30