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1200sporty bike backfires dies under load,wont even crank until 1 hour later,then restartes idles fine,replaced battery,no change

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  • scohung Jul 06, 2008

    could it be modulator

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  • Master
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Hi

It would appear that you have two (2) issues:
1. wont even crank - Due to the massive current required by the starter a component is installed between the starter button and the starter. This component then switches the battery to the starter motor. In cars this is the starting solenoid, in most bikes, this is the starter relay. Normally in the starter relay there would be 2 big terminals for the battery and the starter motor cables with 2 smaller wires for the starter switch and ground. Try this - try pushing the start button with the headlights on, if the headlight dims considerably, then the starting relay is good and the motor is bad; on the other hand if the headlight dims just slightly or not at all, it is the starting relay (the one with the clicking sound). I was made to understand that there was a recall order due to starter relay and/or 30 amps breakers.
On the other hand, most starter motor problems could be:
1. the bearings/bushings at the ends of the armature;
2. carbon brushes;
3. commutator segments (the multiple small copper plates that the brush contacts with).
However, it may be to your advantage to simply replace the motor should it be deemed defective, difficult to secure parts or not economically reasonable to go down component level repair.
2. backfires dies under load - There are 2 major requirement for a gasoline engine to run, fuel and ignition. Backfiring is normally indicative of poor fuel to air mixture (most likely) and/or slightly off ignition firing (just a possibility). Areas to check are you air filter, carbs, plugs, intake manifold, seals/locks.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Jul 06, 2008

  • Louie  Role
    Louie Role Jul 06, 2008

    I am not familiar with a "modulator"

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