'97 K1200RS won't restart when warm - K-Bikes.com - Excellence in Motion
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post #1 of 2 (permalink) Old Jun 24th, 2009, 3:54 pm Thread Starter
Join Date: Jun 2009
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'97 K1200RS won't restart when warm

Hi all!

Well firstly... my first post! so hopefully i do everything right!

Secondly i actually have a technical problem than I could do with some input on?

My bike starts fine when cold.. but as soon as it has had a full heat soak it wont re-start..... it is as if the battery is flat.... but it isn't! The only way to get it doing then is to bump-start it.... then when it is cold again..... starts on the button! I have just checked and cleaned all the earth terminals etc... I'm starting to think it is the start motor..... which seems like a BIG job to replace?

Any way, any input would be greatly appreciated!

over and out..

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post #2 of 2 (permalink) Old Jun 27th, 2009, 3:51 am
Join Date: Mar 2004
Location: , , UK
Posts: 3,750
The most obvious place to start is the starter solenoid relay.

If the starter is regular at faulting when the bike is hot you are in luck. You need to hang a voltmeter on the battery negative and the starter positive terminal if you can get to it, or the big terminal on the starter relay output if you are sure the cable and connections to the starter are ok. Also make sure that the separate thick black cable from the battery negative terminal to the engine metalwork is present, connected and with clean connections under the bolts.

Crank the starter when cold and the voltage should read no less than about 10 volts. Then crank and measure the voltage when hot and the starter is failing. If the voltage is up around 12 volts with a hot motor you have a faulty starter. If the voltage drops to below 10 volts then either your battery is faulty or the starter relay is faulty. Move the test probe back to the battery positive terminal and if the voltage drops to below 10 volts you have a faulty battery.

It is not uncommon for an old battery to fault when hot, but worn starter brushes or a winding fault could also cause a starter fault.

The starter isn't easy to pull out, but you can just get to the positive connection for testing. I think you have to remove the battery box and possibly lift the frame a little.

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Last edited by voxmagna; Jun 27th, 2009 at 3:59 am.
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