03 Yz450f starting problems


5 replies to this topic
  • Bigdong

Posted June 24, 2010 - 02:16 PM

#1

hi,

I just put back together my 03 yz450 but cant get it to start, Timing im pretty sure is dead on but even bumping down a very big hill would not bring it to life.

One thing thats missing completely is the hot start cable and the carb just has a hole where you would screw a cable in. Would this stop it from starting cold??

And can you confirm this timing is correct.

Any other suggestions welcome also.

thx

Posted Image

  • grayracer513

Posted June 24, 2010 - 02:33 PM

#2

...can you confirm this timing is correct(?)

Yes. If that's at TDC, it exactly right.

One thing thats missing completely is the hot start cable and the carb just has a hole where you would screw a cable in. Would this stop it from starting cold??

Yes. :) Can you say, "Massive air leak"? At minimum, you need the plunger, seal, spring, and nut.

  • Bigdong

Posted June 25, 2010 - 01:19 AM

#3

ok That's good, so with the hotstart missing i definately wont beable to start it?
At least it must be the hot start that's stopping it going. Is there any way I could get it to go temporary untill the hotstart componants arrive? Like plugging the hole with a bolt?

Posted Image

Posted Image

and these are the bits i will need to get it going?

36 5TA-14371-00-00 PLUNGER, STARTER
37 5TA-14335-00-00 SPRING, PLUNGER
40 5TA-14155-00-00 GUIDE, CABLE
38 5TA-14991-00-00 SCREW (retaining nut)
39 5TA-14374-00-00 CAP, PLUNGER (cable boot)
41 5TA-14997-00-00 SEAL

Edited by Bigdong, June 25, 2010 - 07:50 AM.


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  • grayracer513

Posted June 25, 2010 - 09:59 AM

#4

You need those parts at minimum.

The hole the plunger goes in is intersected by a passage coming in from the slide well and by another running down from the plunger bore to the carb throat behind the slide. Those are the two holes that need to be blocked off, not the one in the top.

  • Bigdong

Posted June 25, 2010 - 10:02 AM

#5

Thx, :)

  • clevernickname

Posted June 25, 2010 - 07:25 PM

#6

also check tdc in relation to the flywheel. Be sure to check it with a flashlight and use both eyes cause its easy to be 1 tooth off.





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