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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 2 Dec 2010
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Bike wont start

The last few weeks the battery has hardly had the power to turn the engine over fast enough to start it.

I assumed (probably wrongly) that the battery was past it's best so I bought a new one, followed the instructions regarding filling with the dilute acid and put on a slow 12 hour charge.

Using the multimeter I just bought the old battery was putting out the same volts as the new battery so not surprisingly the new charged battery wont start the bike either, it seems fully charged but can hardly manbage to turn the engine over.

It used to start straight away.
Lights are not on and I don't have anything on permanently like an alarm that could drain the power.

Any suggestions?
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  #2  
Old 2 Dec 2010
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Dodgy brushes in the starter motor or dirty commutator can cause these symptoms. You could get an Auto Sparkie to take a look at the starter.
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  #3  
Old 2 Dec 2010
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I am new to this area and a bit isolated so don't know any mechanics in the area.

In the parts catalogue is the starter motor listed as "Generator"?

Under the electrical section in the catalogue, ignitor unit assembly, ignition coil assembly, rectifier and regulator assembly are listed but not starter motor or commutator.
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  #4  
Old 2 Dec 2010
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Start with the easy things.

So you know the battery is working. Good.

It should be easy enough to check the spark plugs are working too. Pull out one spark plug. Check that it is clean. Now with the spark plug out of the engine but connected to the distribution cable, turn over the engine. Keep an eye on the spark plug to see if you get a spark. If not then clean it with a wire brush or sand paper and try again.

After the spark plugs check the starter motor. This can be tricky especially if you don't know what to look for, try a continuity check first then second take off the starter and investigate.

Next would be a solenoid problem or possibly Carb??? I'm getting out of my depth. Check general health of the electrics for any obvious corrosion or burnt out components.

Good luck.
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  #5  
Old 2 Dec 2010
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Yes the battery is good but even on full charge the engine turns over very slow.

The spark plug is clean and sparking well.

I have followed the leads and connectors leading from the battery and all are clean dry and corrosion free.

I don't know where the starter motor is, is is where the black negatice battery lead goes to? If so it's a bit awkward to get to.
What am I looking for if and when I get inside the starter motor?
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  #6  
Old 2 Dec 2010
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the battery was always a bit weak for the engine in XTs, could do with a decompressor!
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