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250 exhaust leak
- oil fuel mixture running down front of the motor
started by Rhythm
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September 28th 2008 at 11:52 PM
[ Modified September 28th 2008 at 11:52 PM
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Rhythm
Rhythm master
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137 Posts 
Group: Members
Member Since: July 5th 2008
Location: Porcupine Plain/Saskatoon, Saskatchewan, Canada
Current Dirtbike: '03 YZ 250
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These bikes have two seals in the pipe, mine appear to be warren out and because my pre mix is a little rich it leaks the excess fuel oil mixture down the front of the motor.
I went and got new springs and what I thought was the seal kit I needed, but it turns out the seal is the same diameter as the outside ring of the pipe and there is only one.
I'm wondering if this o-ring isn't supposed to go between the pipe and the cylinder? or do I just have the wrong one?
'03 YZ 250
Tag bar clamps, titanium 200 foot pegs, Rental American Addition bars, RG3 suspenion, Hotwheels graphics, Griper seat cover, and Carlsbad tires.
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September 29th 2008 at 9:16 AM
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MX86
What's this button do?
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757 Posts 
Group: Moderators
Member Since: June 5th 2008
Location: Nashwauk, MN, USA
Current Dirtbike: 2006 Yamaha yz250
Race Number: 86
Sponsors: X-Brand, Gravity Worx
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the metal crush ring is supposed to go inside the pipe and when the springs are applied, crush between the pipe and the exhaust port thus sealing the pipe off
Living Life 1 berm at a time.
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September 29th 2008 at 11:35 AM
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Rhythm
Rhythm master
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137 Posts
Group: Members
Member Since: July 5th 2008
Location: Porcupine Plain/Saskatoon, Saskatchewan, Canada
Current Dirtbike: '03 YZ 250
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Ok so there is supposed to be a metal crush ring in there? I have mine apart and there isn't any remanince of a crush ring being there before, just two rubber seals that go inside of groves in the pipe.
'03 YZ 250
Tag bar clamps, titanium 200 foot pegs, Rental American Addition bars, RG3 suspenion, Hotwheels graphics, Griper seat cover, and Carlsbad tires.
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September 29th 2008 at 11:54 AM
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MX86
What's this button do?
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757 Posts
Group: Moderators
Member Since: June 5th 2008
Location: Nashwauk, MN, USA
Current Dirtbike: 2006 Yamaha yz250
Race Number: 86
Sponsors: X-Brand, Gravity Worx
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stock pipe?
Living Life 1 berm at a time.
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September 29th 2008 at 2:05 PM
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Rhythm
Rhythm master
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137 Posts
Group: Members
Member Since: July 5th 2008
Location: Porcupine Plain/Saskatoon, Saskatchewan, Canada
Current Dirtbike: '03 YZ 250
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yes its had the stock pipe.
'03 YZ 250
Tag bar clamps, titanium 200 foot pegs, Rental American Addition bars, RG3 suspenion, Hotwheels graphics, Griper seat cover, and Carlsbad tires.
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September 29th 2008 at 6:27 PM
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DarksideCR
My givadamn broke and I aint fucking fixing it!
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341 Posts
Group: Members
Member Since: July 4th 2008
Location: Kirkland lake, ONTARIO, Canada
Current Dirtbike: 2000 CR250R
Sponsors: Vortex
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yeah mine has 2 metal rings between the flange and the pipe,2 oil seals on the pipe end,
The honda revolution continues!
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October 2nd 2008 at 6:48 PM
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Polaris1man
Starting Member
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24 Posts
Group: Members
Member Since: August 28th 2008
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Lean that rice grinder down, Amsoil at 50:1 and you are "crisp" on the throttle, clean at the pipe. If you are throwing a ton of oil out teh front, time for Rings at a minimum. Don't buy that crap from Yamaha at 20:1 to 32:1, you're safe at 40:1 with ****ty oil, yes, Yamahalube. Christ you could mix you car oil even after you ran 3000 miles on it, and get better results!!
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October 2nd 2008 at 11:14 PM
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Rhythm
Rhythm master
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137 Posts
Group: Members
Member Since: July 5th 2008
Location: Porcupine Plain/Saskatoon, Saskatchewan, Canada
Current Dirtbike: '03 YZ 250
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the had in my other post is has. I'm still running the stock pipe, and because i'm kinda out of the racing seen, just racing the odd time not the whole season I don't plan on adding the pipe cuz it has enough power for me as it is.
'03 YZ 250
Tag bar clamps, titanium 200 foot pegs, Rental American Addition bars, RG3 suspenion, Hotwheels graphics, Griper seat cover, and Carlsbad tires.
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October 19th 2008 at 5:38 PM
[ Modified October 19th 2008 at 5:39 PM
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Rhythm
Rhythm master
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137 Posts
Group: Members
Member Since: July 5th 2008
Location: Porcupine Plain/Saskatoon, Saskatchewan, Canada
Current Dirtbike: '03 YZ 250
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Quote originally posted by Polaris1man
Lean that rice grinder down, Amsoil at 50:1 and you are "crisp" on the throttle, clean at the pipe. If you are throwing a ton of oil out teh front, time for Rings at a minimum. Don't buy that crap from Yamaha at 20:1 to 32:1, you're safe at 40:1 with ****ty oil, yes, Yamahalube. Christ you could mix you car oil even after you ran 3000 miles on it, and get better results!!
I'm mixing at 40:1 right now with Amsoil and it has 125 psi so it shouldn't need rings. Its not a ton of oil leaking down the front its enought that you can see it and after a good long ride its everywhere on the front and bottom of the motor.
Update on my progress with fixing this is went and got two round o-rings from the hardware store just to try and see if it would fix it. Found out that the square ones seal on two points because of the grove in the outside edge, the round ones only seal on one point, this still allows some oil past. So $1.79 didn't fix it, but went to yamaha yesterday to see if they had the right ones, $26.85 later I hope I have it fix, but won't know until they arrive cuz they weren't in stock.
'03 YZ 250
Tag bar clamps, titanium 200 foot pegs, Rental American Addition bars, RG3 suspenion, Hotwheels graphics, Griper seat cover, and Carlsbad tires.
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October 21st 2008 at 10:03 PM
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MX4life
lovin' the 2 stroke
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139 Posts
Group: Members
Member Since: June 18th 2008
Location: Oshawa, Ontario, Canada
Current Dirtbike: 02 CR250/86 XR100
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dont OEM prices suck!
2002 Honda CR250R
1986 Honda XR100R
2002 Honda CR125R(SOLD)
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October 21st 2008 at 11:04 PM
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Rhythm
Rhythm master
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137 Posts
Group: Members
Member Since: July 5th 2008
Location: Porcupine Plain/Saskatoon, Saskatchewan, Canada
Current Dirtbike: '03 YZ 250
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yup that they do.....but if i don't have to do anything to it for a couple years its worth it.
'03 YZ 250
Tag bar clamps, titanium 200 foot pegs, Rental American Addition bars, RG3 suspenion, Hotwheels graphics, Griper seat cover, and Carlsbad tires.
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December 2nd 2009 at 8:35 PM
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MX86
What's this button do?
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757 Posts
Group: Moderators
Member Since: June 5th 2008
Location: Nashwauk, MN, USA
Current Dirtbike: 2006 Yamaha yz250
Race Number: 86
Sponsors: X-Brand, Gravity Worx
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Quote originally posted by Rhythm
Quote originally posted by Polaris1man
Lean that rice grinder down, Amsoil at 50:1 and you are "crisp" on the throttle, clean at the pipe. If you are throwing a ton of oil out teh front, time for Rings at a minimum. Don't buy that crap from Yamaha at 20:1 to 32:1, you're safe at 40:1 with ****ty oil, yes, Yamahalube. Christ you could mix you car oil even after you ran 3000 miles on it, and get better results!!
I'm mixing at 40:1 right now with Amsoil and it has 125 psi so it shouldn't need rings. Its not a ton of oil leaking down the front its enought that you can see it and after a good long ride its everywhere on the front and bottom of the motor.
Update on my progress with fixing this is went and got two round o-rings from the hardware store just to try and see if it would fix it. Found out that the square ones seal on two points because of the grove in the outside edge, the round ones only seal on one point, this still allows some oil past. So $1.79 didn't fix it, but went to yamaha yesterday to see if they had the right ones, $26.85 later I hope I have it fix, but won't know until they arrive cuz they weren't in stock.
125 psi? holy ****.. my yz has 250+ psi... btw, ever get the oil thing figured out?
Living Life 1 berm at a time.
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