2003 yzf450 leak?


4 replies to this topic
  • lehmbeezy

Posted June 10, 2016 - 10:27 AM

#1

Hey guys so I'm going to buy a 2003 yzf450 for 1400,looks like great condition seller claims it was just rebuilt but the head gasket was reused so it's leaking coolant out of the overflow I was thinking of repairing it myself either with a new big bore cylinder kit,or even just the gasket, basically I'm just wondering if this sounds like something else is up with the bike or if it'll Just be a easy fix, also I've never rebuilt a top end before, I'm mechanicaly inclined with cars am I biting off more than I can chew or should I be fine?

  • grayracer513

Posted June 10, 2016 - 11:57 AM

#2

Well, if he didn't know or care better than to reuse the head gasket, his "rebuild" could be a can of worms. 

 

Coolant being exhausted from the overflow is normal under 3 circumstances:

  • Idling too long (no air flow over the radiators)
  • Extended time in tight or technical low speeds sections (same problem)
  • Overfilling the radiators (coolant will expand and force itself out if filled higher than the  tops of the core tubes)

Pretty much anything else is abnormal, and a head gasket will do it every time.

 

Get a manual, read it, follow it.  You'll be alright.  Leave the bike mostly stock, ride it a while, sell it for something newer, and modify that. 

 

http://api.viglink.c...uals/index.aspx

 

http://api.viglink.c...ook.com.au/?r=0



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  • lehmbeezy

Posted June 10, 2016 - 01:05 PM

#3

Well, if he didn't know or care better than to reuse the head gasket, his "rebuild" could be a can of worms.

Coolant being exhausted from the overflow is normal under 3 circumstances:

  • Idling too long (no air flow over the radiators)
  • Extended time in tight or technical low speeds sections (same problem)
  • Overfilling the radiators (coolant will expand and force itself out if filled higher than the tops of the core tubes)
Pretty much anything else is abnormal, and a head gasket will do it every time.

Get a manual, read it, follow it. You'll be alright. Leave the bike mostly stock, ride it a while, sell it for something newer, and modify that.

http://api.viglink.c...uals/index.aspx

http://api.viglink.c...ook.com.au/?r=0
So it's possible.hes a idiot and it's just doing what its suppose to? And I'm not into upgrading this thing just need a bike to get out there and rise with my girlfriend on, lol thanks for the advice I thibk I'm gonna give it a go

  • grayracer513

Posted June 10, 2016 - 02:21 PM

#4

If he reused the head gasket, he's an idiot.  If you don't replace it, well....



  • lehmbeezy

Posted June 11, 2016 - 02:16 PM

#5

If he reused the head gasket, he's an idiot. If you don't replace it, well....

so I was looking online and found a big bore kit with full cylinder and piston for 400$, gonna just replace the whole thing, dumb question but is there anything else that the "top end" consist of? Or is that a total top end rebuild?





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