Performance Engine Mods and E start


30 replies to this topic
  • CanadianWR450

Posted October 09, 2009 - 12:12 AM

#21

Guide seals were replaced when torn down. Never had a leak down test, but it's going to get one before I put it away for the winter.

"Hard to believe the cylinder would still be in spec if all the cross hatching was worn away."

I think that is exactly what went wrong. I had a friend who has worked on / rebuilt bikes his entire life work on the engine. We measured and it was "border line"....he's a old school 2 stroke, and air cooled XR guy though, and well...maybe his version of "borderline" might have been OK for those, but not a newer style 4 stroke. I also put a LOT more miles on then he does, and I did get 2,000 km's out of it without a hint of smoke/oil burn.

I'm chalking it up as a personal learning experience for myself....lol

Guess I'll know for sure after this spring, and I'll see what the leak down comes out at with the dealer here

  • tribalbc

Posted October 11, 2009 - 09:27 PM

#22

Well I've started my rebuild/upgrade.
Decided to go with motor out of frame. Got it out today.
Took about 2hrs.

  • beezer

Posted October 12, 2009 - 06:26 AM

#23

I put YZ cams in my 08 and it runs much better. It has more low end and is acutally easier to ride. I dunno about a high compression piston.

I put one in an 03 YZ450 that I run on the ice and flat track. It is pretty snotty now. I don't think I'd like it in the woods.

The YZ cams made the e-start not work as well. Sometimes you can feel it gets hung up on a compression stroke and won't move the piston.

I use the kick start on the bike when it's cold and the e-start after it's warm.

  • thatraptorguy

Posted October 12, 2009 - 05:54 PM

#24

I put YZ cams in my 08 and it runs much better. It has more low end and is acutally easier to ride. I dunno about a high compression piston.

I put one in an 03 YZ450 that I run on the ice and flat track. It is pretty snotty now. I don't think I'd like it in the woods.

The YZ cams made the e-start not work as well. Sometimes you can feel it gets hung up on a compression stroke and won't move the piston.

I use the kick start on the bike when it's cold and the e-start after it's warm.


wait so your bike was never like this when it had the regular wr450 cams in it????i just picked up a used wr450 and it gets hung up on tdc with the estart quite a bit and is making me wonder if i have these cams in mine.....any way to tell??

  • tribalbc

Posted October 12, 2009 - 06:00 PM

#25

wait so your bike was never like this when it had the regular wr450 cams in it????i just picked up a used wr450 and it gets hung up on tdc with the estart quite a bit and is making me wonder if i have these cams in mine.....any way to tell??


They all do it. I was hoping maybe the YZ cams would eliminate this for me but I guess not.

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  • thatraptorguy

Posted October 12, 2009 - 06:35 PM

#26

They all do it. I was hoping maybe the YZ cams would eliminate this for me but I guess not.


alright got ya....sorry

  • beezer

Posted October 13, 2009 - 06:03 AM

#27

They do it but it's worse with the YZ cams.

But the bike runs so much better I don't care.

When it hangs up you just use the kick starter.

BTW if your battery isn't in good shape it will do it more often.

  • erickdj

Posted October 14, 2009 - 10:14 AM

#28

I use the kick start on the bike when it's cold and the e-start after it's warm.


That's interesting. Mine does the opposite(06 yz cams). It will start cold with e-start really easy, almost as soon as I touch the button, but it's a bit finicky when warm/hot. I've figured it out though, all I need to do when it's warm is give it a 1/8 twist of throttle, pull the hot-start lever and hold the button down a little longer than usual. Starts up 99.9% of the time using that approach. Makes me think that a bit of tinkering with the jets would sort it out, but the bike performs really well otherwise, so I just live with it as-is.

  • beezer

Posted October 14, 2009 - 11:17 AM

#29

I think I'd leave that one alone. No WR450 I have ever owned started easily on the button when cold.

  • Parx_400

Posted October 14, 2009 - 11:42 AM

#30

Jetting is a big part of getting the estart to work with the yz cam. I have my bike jetted pretty good with an open pipe. So long as the bike is warm the estart works fine. It works cold aswell but I dont like to wear the batt down.

  • erickdj

Posted October 14, 2009 - 02:24 PM

#31

I think I'd leave that one alone. No WR450 I have ever owned started easily on the button when cold.


Mine always started fine hot or cold before I installed the yz cams, but I do have an open pipe on it.




 
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