Losing/Burning Oil during race day.


10 replies to this topic
  • Goobz_MX718

Posted March 23, 2010 - 06:56 PM

#1

I had an 05yzf450 and it started burning oil not long after it had a new piston rings, head, timing chain etc. Would race one day and check oil, had to add a lot. SOLD IT!
Now my 06 with minimal hours is burning oil. Definately smoke on start up. Would that be the rings or the valves and seals. Was thinking more the rings. If it was the seals, wouldn't there be oil in the exhaust head pipe, or would it just burn off to fast to notice if i took the head pipe off. Plus, i had the motor apart recently due to a kinked timing chain that was skipping cam gears so i pulled the motor down to the piston just to check things out. Head and valves looked good IMO.

I did a top end and checked valves on a buddies bike last weekend and found that one of the exhaust valves wasn't closing all the way due to carbon build up. We just cleaned the head and valves/seats and put new seal on that valve. New pison/ring/timing chain. Runs great. His was burning lots of oil too. What is an average amount of oil to be losing on lets say, a race day. 15 minute practice, 2 15-20 minute moto's.

  • djuhnk

Posted March 24, 2010 - 07:57 AM

#2

if you are using regular mineral oil there is a certain amount that evaporates from getting hot. where as synthetic oil tends to be more stable through hot temperatures. the first thing i would do is try to switch to synthetic if you are using regular oil

  • grayracer513

Posted March 24, 2010 - 08:03 AM

#3

A normal, healthy YZF will loose little if any oil during operation.

  • Aka.Goose

Posted March 24, 2010 - 09:08 AM

#4

My 07, burned through a ton of oil from bad rings, caused by jumping time. My chain had no kinks, but the tensioner had failed. The spring in it was much weaker than the new unit. I believe this is because of a crappy little junky spring in there that can't handle several extreme heat cycles without changing it's effectiveness.

  • Goobz_MX718

Posted March 25, 2010 - 01:16 PM

#5

My 07, burned through a ton of oil from bad rings, caused by jumping time. My chain had no kinks, but the tensioner had failed. The spring in it was much weaker than the new unit. I believe this is because of a crappy little junky spring in there that can't handle several extreme heat cycles without changing it's effectiveness.


maybe i should break it back down, and change the rings. I'm using a synt blend. Motul 5100 15w50. Maybe my rings are worn too. I mean if the chain was as stretched as it was, maybe rings worn out too.

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  • JandJ07

Posted March 25, 2010 - 04:20 PM

#6

Maybe its Karma

  • JandJ07

Posted March 25, 2010 - 04:23 PM

#7

My 07, burned through a ton of oil from bad rings, caused by jumping time. My chain had no kinks, but the tensioner had failed. The spring in it was much weaker than the new unit. I believe this is because of a crappy little junky spring in there that can't handle several extreme heat cycles without changing it's effectiveness.


How does jumping time damage rings?

  • Aka.Goose

Posted March 25, 2010 - 04:48 PM

#8

How does jumping time damage rings?


Ahhh, Gray will have to chime in on that one...

  • grayracer513

Posted March 25, 2010 - 07:11 PM

#9

Don't point that at me.

  • JandJ07

Posted March 25, 2010 - 07:17 PM

#10

Don't point that at me.


Thats what I thought your reaction would be:thumbsup:

The only way I can see cam timing damaging rings would be if it jumped far enough out for the piston to hammer a valve, then send it through the cylinder wall.

  • Goobz_MX718

Posted March 26, 2010 - 03:58 PM

#11

Maybe the rings are just worn or burnt or whatever they do. If the chain was as stretched as it was, it probably had more hours on it when i bought it than was told to me. I'll try it after racing Cahuilla this weekend for the mammoth qualifier.
Thanks for the input fella's





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