05 WR450 weak starter


5 replies to this topic
  • wtraburn

Posted September 19, 2011 - 06:49 PM

#1

My 05 wr450 starter sounds like it doesn't have enough torque to spin the motor. It just stops at the compression stroke. It has a new starter, battery, and solenoid. To be sure the starter and battery wasn't bad, I load checked the battery and took the starter apart and checked the commutator and insulation resistance to the specs. I've also tried jumping with a car battery and it still doesn't have enough to continuously turn over the motor. It used to spin the motor better than it does now. It seems to be getting worse. Can a faulty starter clutch cause added resistance and make it sound like the starter doesn't have enough torque to start it? I've also checked the decompression cam and it works properly. I haven't checked the valve gaps, but it starts up easily with a strong kick.

  • Krannie McKranface

Posted September 19, 2011 - 08:51 PM

#2

My 05 wr450 starter sounds like it doesn't have enough torque to spin the motor. It just stops at the compression stroke. It has a new starter, battery, and solenoid. To be sure the starter and battery wasn't bad, I load checked the battery and took the starter apart and checked the commutator and insulation resistance to the specs. I've also tried jumping with a car battery and it still doesn't have enough to continuously turn over the motor. It used to spin the motor better than it does now. It seems to be getting worse. Can a faulty starter clutch cause added resistance and make it sound like the starter doesn't have enough torque to start it? I've also checked the decompression cam and it works properly. I haven't checked the valve gaps, but it starts up easily with a strong kick.


- adjust your decompression lever for more decompression
- don't start in gear

  • BEAN329

Posted September 20, 2011 - 08:13 PM

#3

wrong , there is no decompression lever.

my 2003 had the same problem and it was a faulty relay.

try bypassing the relay.

there may also be something wrong inside the motor itself.

does your kick starter hangup as well ????

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  • wtraburn

Posted September 21, 2011 - 01:05 PM

#4

The 05 has an auto decompression cam and it works properly. I just replaced the starter relay. There is also a shutoff relay but I don't think it can affect the performance of the starter. It either allows the main starter relay to activate or it doesn't, depending on whether the bike is in neutral or the clutch is pulled in. I also tried jumping the relay which didn't help and I tried directly bypassing the relay with a car battery which also didn't help. I'm tempted to replace the wires going to the starter but I don't measure any resistance in them. I think it is something in the motor. My kick starter doesn't hangup. It works properly. I've taken my torque limiter out and I can't find anything wrong with it. I am guessing it has to be the starter clutch, but I don't know anything about it. I don't understand how the starter clutch could add resistance during the start but not while running. If there was any added resistance while running, parts would overheat quickly and something would fail. I guess I need to take the case apart and check the starter components.

also, I did the blue/white wire mod which was very beneficial for kickstarting and e starting at the same time. I had this problem before I did that. I did the mod because I was having to kick and e start at the same time.

The bike does have a lot of compression and is hard to kick but I assume every wr450 is like that. I literally ripped a hole through the sole of a cheap pair of boots over the course of a couple rides from kick starting it. I should probably have a mechanic start it. Someone that would know if it is harder kick than other bikes.

  • William1

Posted September 21, 2011 - 01:16 PM

#5

The WR400 series of bikes has a tiny starter motor being taxed at its' limits.

A good cleaning (make careful notes when you take it apart so it does not run backwards upon re-assembly) undercutting of the commutator, replacement of the brushes and sparing moly lube applied to the brushes works wonders.

Hard starting too, esp. when kicking is a sign of poor maintenance or a fuel screw out of adjustment.

  • miweber929

Posted September 21, 2011 - 01:18 PM

#6

The 05 has an auto decompression cam and it works properly. I just replaced the starter relay. There is also a shutoff relay but I don't think it can affect the performance of the starter. It either allows the main starter relay to activate or it doesn't, depending on whether the bike is in neutral or the clutch is pulled in. I also tried jumping the relay which didn't help and I tried directly bypassing the relay with a car battery which also didn't help. I'm tempted to replace the wires going to the starter but I don't measure any resistance in them. I think it is something in the motor. My kick starter doesn't hangup. It works properly. I've taken my torque limiter out and I can't find anything wrong with it. I am guessing it has to be the starter clutch, but I don't know anything about it. I don't understand how the starter clutch could add resistance during the start but not while running. If there was any added resistance while running, parts would overheat quickly and something would fail. I guess I need to take the case apart and check the starter components.

also, I did the blue/white wire mod which was very beneficial for kickstarting and e starting at the same time. I had this problem before I did that. I did the mod because I was having to kick and e start at the same time.

The bike does have a lot of compression and is hard to kick but I assume every wr450 is like that. I literally ripped a hole through the sole of a cheap pair of boots over the course of a couple rides from kick starting it. I should probably have a mechanic start it. Someone that would know if it is harder kick than other bikes.


Nope, they kick easy. Only the older ones with the manual decomp kick hard (if you don't use it). Your auto decompressor is not functioning correctly, which would pretty much explain everything. Tear apart the head and find out what is up.




 
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