Question about 2005 Yamaha WR 450 F

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STARTER NOISE When hot my WR450 is making a screaming noise when the starter is engaged and then flattens the battery as the engine turns slowly and then will not turn over. When cold it seems ok but still a slight noise. Sounds like the starter bearing grabbing the shaft when hot ??????????????

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The starter is deffinately 'dragging'.
Chances are that it has dropped a bush.
I'm not sure if Yamaha does a servie kit for the starter, but your local dealer will give you that info.

Most good auto electricians should be able to assist you.

To test the starter, place a multi metre across the battery terminals(the battery must be fully charged). Crank the motor and check how many amps the starter is drawing. Anything more than 30 amps is a sure sign of a failing starter.

Good luck


Posted on Mar 09, 2009

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1. Battery terminals have loose or corroded connections.
2. Battery cables faulty due corroded or broken internal wiring at the cable connector especially the "NEGATIVE" cable which needs to be checked at "BOTH" ends.
3. Battery voltage, 12.5 volts or better,to the main circuit breaker to the ignition switch to the security/ignition fuse to the TSM/TSSM module to the engine stop/run switch to the starter button to the starter relay to the green wire that connects to the starter solenoid has dropped more than 1/2 volt.
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7. Faulty starter, bench test starter with a 12-volt battery if negative function check, decontaminate and undercut armature commutator segments as necessary, check segments with an ohmmeter probe each one and the segment next to it for shorts. Have the armature tested with a growler and field coils, and brush plate with an ohm-meter for opens, shorts or grounds. Replace brushes if less than .438" It is generally cheaper to overhaul/refurbish a starter motor than buy a new one.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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