09 WR450 Cam Issue GYTR or Stock YZ?


57 replies to this topic
  • KennyMc

Posted June 30, 2013 - 08:27 AM

#21

Wait, I think I have it. Take your stock exhaust cam. Push down lightly on the decomp ok. Does it move? I don't think it should. Now, do the same on the Hotcam. Does it move? Mine did. That was the issue. The mechanism wasn't correct so any contact with the exhaust valve would push the decomp pin in a little thereby not releasing the compression at startup.

  • crash279

Posted June 30, 2013 - 08:37 AM

#22

Wait, I think I have it. Take your stock exhaust cam. Push down lightly on the decomp ok. Does it move? I don't think it should. Now, do the same on the Hotcam. Does it move? Mine did. That was the issue. The mechanism wasn't correct so any contact with the exhaust valve would push the decomp pin in a little thereby not releasing the compression at startup.


What did you do to correct this?

  • KennyMc

Posted June 30, 2013 - 10:35 AM

#23

What did you do to correct this?

I had to send it to Hotcam and they replaced the mechanism. When I got it back, I did the same test and it did not move this time. Again, there error and don't let them tell you "it's a racing part". BS, putting the decomp mechanism is a manual install. It has nothing to do with the mfg. of the cam!

Edited by kenshaw720, June 30, 2013 - 10:35 AM.


  • crash279

Posted July 01, 2013 - 08:36 AM

#24

I'm going to tear into the bike this week and will post up what I find. I appreciate everyone's advice and feedback on this.

  • KennyMc

Posted July 01, 2013 - 10:20 AM

#25

Yeah, like I said, compare the 2 decomp pin's mechanism's. Not the mechanism itself per say. Push down on the decomp pin on the stock cam and see how it reacts. Then push down on the Hotcam decomp pin with the same amount of force and see how it reacts. They should react the same way.

With mine, the stock one wouldn't move but the Hotcam would. This might not be your problem but I hope it is. I spent a lot of time chasing the same ghost....starter brushes, starter, battery.... :banghead:

  • crash279

Posted July 01, 2013 - 10:43 AM

#26

Yeah, like I said, compare the 2 decomp pin's mechanism's. Not the mechanism itself per say. Push down on the decomp pin on the stock cam and see how it reacts. Then push down on the Hotcam decomp pin with the same amount of force and see how it reacts. They should react the same way.

With mine, the stock one wouldn't move but the Hotcam would. This might not be your problem but I hope it is. I spent a lot of time chasing the same ghost....starter brushes, starter, battery.... :banghead:


Oh don't get me started on batteries lol.

  • KennyMc

Posted July 01, 2013 - 01:29 PM

#27

Oh don't get me started on batteries lol.

I got Shorai to do a 75% warranty on mine. Did that get you started :-)

  • Parx_400

Posted July 01, 2013 - 04:13 PM

#28

I know these are lots of views on this but here is my 2 cents. in my old WR450 I put a 05 yz cam in it. The bike would kick start so easy you could almost do it with your hand. I played with the jetting and was able to E start it warm. You had to open the throttle just a hair. putting pressure on the throttle cables was all you needed. I have read that the 03-05 yz450 needed just a hair of gas to start as well.

  • crash279

Posted July 01, 2013 - 04:35 PM

#29

I know these are lots of views on this but here is my 2 cents. in my old WR450 I put a 05 yz cam in it. The bike would kick start so easy you could almost do it with your hand. I played with the jetting and was able to E start it warm. You had to open the throttle just a hair. putting pressure on the throttle cables was all you needed. I have read that the 03-05 yz450 needed just a hair of gas to start as well.


My dual sport just requires the hit start and it'll fire right off no problem. It'll also easily start with the kick starter just like you mentioned with your's...

  • Krannie McKranface

Posted July 01, 2013 - 05:08 PM

#30

My WR starts perfectly every time. Even after being upside down on top of me.
Power band still is less than good with the HC YZ cams.
It 'runs' fine, but it's too soft on the bottom. It will not pull the lower gears like a stock uncorked WR.
I suspect the 'race' pipe I put on it might be part of the problem

I wish I could find a 2007+ STOCK PIPE to buy

Edited by Krannie, July 01, 2013 - 05:08 PM.


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  • KennyMc

Posted July 04, 2013 - 08:03 AM

#31

I'm going to tear into the bike this week and will post up what I find. I appreciate everyone's advice and feedback on this.


Any progress with this? Inquiring minds wanna know. I hope it is just that simple....

  • crash279

Posted July 04, 2013 - 08:15 AM

#32

Any progress with this? Inquiring minds wanna know. I hope it is just that simple....


Actually about to head into the garage shortly. Stay tuned...

  • crash279

Posted July 05, 2013 - 02:39 PM

#33

Okay, I got the wife distracted, time for surgery:

1373063906597.jpg 1373063924502.jpg

  • crash279

Posted July 05, 2013 - 03:10 PM

#34

So far here is what I've got:

1373065504608.jpg
1373065532964.jpg
1373065556337.jpg

Here's a few spares from other cam installs that worked as advertised:

1373065636402.jpg

This one not so much...Hotcam #1:

1373065674601.jpg

Attached Thumbnails

  • 1373065730041.jpg


  • crash279

Posted July 05, 2013 - 03:24 PM

#35

And sounds like you guys were right lol. The cam on the left is the newest one and the one on the right is the junk cam. However the cam on my right has a brand new decompression pin for the wr450.

1373066613506.jpg 1373066631397.jpg 1373066644957.jpg

  • crash279

Posted July 05, 2013 - 03:27 PM

#36

One more:

1373066808945.jpg

  • KennyMc

Posted July 05, 2013 - 04:54 PM

#37

How does the pin react on the cam you just got from them. Does it move in when you push in on the pin? Do they act differently?

  • crash279

Posted July 05, 2013 - 04:56 PM

#38

How does the pin react on the cam you just got from them. Does it move in when you push in on the pin? Do they act differently?


I had to run an errand before the sun goes down. I'll check in a few minutes when I get back home.

  • KennyMc

Posted July 05, 2013 - 05:20 PM

#39

I had to run an errand before the sun goes down. I'll check in a few minutes when I get back home.

Your killing me Smalls :-)

  • crash279

Posted July 05, 2013 - 06:27 PM

#40

They both act identically. No movement or freeplay in either of the pins.

Edited by crash279, July 05, 2013 - 06:53 PM.





 
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