Yz450 decompresion plug


12 replies to this topic
  • GENE426

Posted November 04, 2006 - 11:31 AM

#1

My bike is dripping oil and I cant remember what the compresion release plug looks like so I dont know if it fell out or not?
does someone have a pic of the plug being in?

  • GENE426

Posted November 04, 2006 - 11:36 AM

#2

It has oil on the bottom right side of the rediator and is dripping on the hedder,
Where can the oil come from?

  • grayracer513

Posted November 04, 2006 - 02:24 PM

#3

Above the header, at about 10 or 11 o'clock to the pipe, on the front of the head, is a bore that used to accommodate the compression release shaft. There should be a plug in there, flush with the outside of the head. If you can see a hole, or stick a finger in it, the plug is gone.

  • GONE1445

Posted November 04, 2006 - 02:31 PM

#4

yea it will be even with the bottom of the radiator almost but on the head

sounds like it has come out by the way the oil is hitting the rad and the pipe

  • tnl

Posted November 04, 2006 - 06:56 PM

#5

My bike is dripping oil and I cant remember what the compresion release plug looks like so I dont know if it fell out or not?
does someone have a pic of the plug being in?


Gene, I have a picture of mine with it saftey wired but photobucket is not working right now so I can't up load the pic's . Pm me with your e-mail address and I'll send it to you.
Tnl.

  • GENE426

Posted November 05, 2006 - 09:05 AM

#6

I have the thick azz owners manual and it does not show it????????

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • grayracer513

Posted November 05, 2006 - 09:53 AM

#7

It's item 15 in this illustration:

http://parts.yamaha-...ifx?d=52815,2,0

Note that it isn't on the cylinder head page. That's why it's so hard to locate.

  • GENE426

Posted November 05, 2006 - 04:58 PM

#8

Well I can stick my finger in the hole, So now what
Is it just a case of getting a new plug part #15 and putting the plug back in or could it have damaged the motor at all???????
There was not much dirt near it to my supprise.....
what do yall think

  • grayracer513

Posted November 05, 2006 - 05:59 PM

#9

You can put the same thing back, but it will come out again. Look for something pinching or blocking the breather hose. especially the metal clips that hold it to the frame.

Replacement options include the TT plug from the Store, or an 18mm cup plug (freeze plug, expansion plug). This is discussed in detail in the thread below. Read through it.

http://www.thumperta...235#post3954235

  • GENE426

Posted November 05, 2006 - 07:23 PM

#10

If I order that TT Plug I just remove the bolt insert the plug and replace the bolt Right?

  • grayracer513

Posted November 05, 2006 - 07:54 PM

#11

Basically, yes.

Here's the instructions

  • GENE426

Posted November 05, 2006 - 08:14 PM

#12

that is the only thing that could be leaking right?
Engine looks clean and I cant think of another place for oil to come from?

  • grayracer513

Posted November 05, 2006 - 08:27 PM

#13

It's probably the only thing that is, and it certainly is if the plug is missing, but it isn't the only thing that could be leaking. The cam cover could leak, but it's doubtful that it would. I'll go out on a limb and promise you that the plug will solve your problem.





Related Content

Forums
Photo

Michigan Motocross Tires by 288yz450


Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply
Forums
Photo
Motocross

Thinking about Yamaha 250... by Arctic Pride


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies
Forums
Photo

2016 YZ450 by CaptainKnobby


Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies
Forums
Photo

Is it worth it? (Cam and High compression piston) by macgi77


Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies
Forums
Photo

James Stewart back on a YZ450F by YamaLink


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies
 
x

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.