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possible problem with my first bike
- i just bought this bike and im sorta confused! need your opinions please
started by rmz-rider
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February 17th 2010 at 6:54 PM
[ Modified February 17th 2010 at 6:55 PM
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rmz-rider
Starting Member
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20 Posts
Group: Members
Member Since: January 26th 2010
Location: Ontario, Canada
Current Dirtbike: 05 kxf 250
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hey guys, i just bought a 2005 kx 250f yesturday with a few goodies, its got the full pro circuit t-4 pipe and header, green excel rims, hinson clutch etc..
i was riding it around the yard a few laps today, and i noticed some oil leaking out of the bottom of the motor, so i took the front skid plate off and noticed it was all siliconed up. so i phoned the guy i bought it off of to see what he had to say. he said its supposed to have it on there. its where the two halfs of the motor connect. he says it has always had it on there. should i peel it off and replace the silicone or i was thinking a could jb weld it ?
what are your opinions on what i should do ? i dont have a clue what i should do.
Thanks!
SOLD 2005 kx 250f.
- pro circuit ti-4 full exhaust
- pro circuit water pump system
- hinson clutch
wishing i could buy a new bike!
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February 17th 2010 at 8:03 PM
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edmonster
to fat to 50 but doing it anyways!
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196 Posts 
Group: Members
Member Since: June 22nd 2008
Location: Ely, MN
Current Dirtbike: custom pitbike
Race Number: not needed
Sponsors: dont need any
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i probably wouldnt jb weld your cases together...
50cc's of mayhem
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February 17th 2010 at 8:53 PM
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MX86
What's this button do?
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753 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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got a picture?
I know with the yamaha cases they are glued together with a silicone/adhesive called yamabond. possible that it could have developed a spot in the case were it's leaking, or could be a more serious issue
Living Life 1 berm at a time.
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February 17th 2010 at 10:55 PM
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Kawi_Rider_316
Team Not Even Scared
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619 Posts 
Group: Members
Member Since: July 11th 2008
Location: Ocheyedan, Ia, USA
Current Dirtbike: Kx 250F
Race Number: 316
Sponsors: Spencer Motorsports
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I would not recomend JB weld. I will check what mine looks like but I am pretty sure its a glue that you just spread on, like yamahabond. Also are you sure its coming from the bottom of the case? Could it be running down from somewhere else? on my 07' kx I always had a small amount of oil that would get on the skid plate/frame area. I dont know where it was coming from but I never lost very much so I didnt worry about it. Like I said it wasnt much at all, when I would take it off the stand you could see a lil on the top of the stand and if you looked there was some on the skid plate but not much. Just make sure you locate where its coming from before you redo your silicone or what ever.
"Jump for show, Corner for dough"
"In ball and stick sports they give you the balls, In Motocross you have to bring your own"
Sponsors:
Glens Sport Center, FC MODS, MSR, Sunline, Tag, Filtron, Six Six One, Steel Mx, Dunlop,
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February 18th 2010 at 11:18 AM
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Savage-CR
Savage
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153 Posts
Group: Members
Member Since: November 26th 2009
Current Dirtbike: I change this too much
Sponsors: Tosca Banquet Hall
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Is the case smashed at all?
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February 18th 2010 at 1:49 PM
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rmz-rider
Starting Member
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20 Posts
Group: Members
Member Since: January 26th 2010
Location: Ontario, Canada
Current Dirtbike: 05 kxf 250
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Quote originally posted by Kawi_Rider_316
I would not recomend JB weld. I will check what mine looks like but I am pretty sure its a glue that you just spread on, like yamahabond. Also are you sure its coming from the bottom of the case? Could it be running down from somewhere else? on my 07' kx I always had a small amount of oil that would get on the skid plate/frame area. I dont know where it was coming from but I never lost very much so I didnt worry about it. Like I said it wasnt much at all, when I would take it off the stand you could see a lil on the top of the stand and if you looked there was some on the skid plate but not much. Just make sure you locate where its coming from before you redo your silicone or what ever.
yeah, it looked like silicone was just spread over it. so are you saying there is no gasket that is supposed to be. because it was leaking from a spot where the silicone has started peeling off a bit. should i just buy some yamabond ang seal it all up again?
SOLD 2005 kx 250f.
- pro circuit ti-4 full exhaust
- pro circuit water pump system
- hinson clutch
wishing i could buy a new bike!
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February 18th 2010 at 2:35 PM
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rmz-rider
Starting Member
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20 Posts
Group: Members
Member Since: January 26th 2010
Location: Ontario, Canada
Current Dirtbike: 05 kxf 250
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Quote originally posted by Savage-CR
Is the case smashed at all?
nope, not at all
SOLD 2005 kx 250f.
- pro circuit ti-4 full exhaust
- pro circuit water pump system
- hinson clutch
wishing i could buy a new bike!
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February 18th 2010 at 10:38 PM
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Kawi_Rider_316
Team Not Even Scared
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619 Posts
Group: Members
Member Since: July 11th 2008
Location: Ocheyedan, Ia, USA
Current Dirtbike: Kx 250F
Race Number: 316
Sponsors: Spencer Motorsports
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Yamaha bond I believe is similar to a gasket. I dont think you will be able to just put it on and seal it. In my experience you put that on like a gasket, so you would have the cases split scrape off the old stuff then put the yamahabond on and spread it around then put the cases back together.
"Jump for show, Corner for dough"
"In ball and stick sports they give you the balls, In Motocross you have to bring your own"
Sponsors:
Glens Sport Center, FC MODS, MSR, Sunline, Tag, Filtron, Six Six One, Steel Mx, Dunlop,
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February 18th 2010 at 11:15 PM
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MX86
What's this button do?
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753 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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when the cases are bolted back together it squishes the liquid gasket out and fills into the porous aluminum. have to scrape it off, clean the surfaces with a contact cleaner and re-apply
Living Life 1 berm at a time.
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February 18th 2010 at 11:33 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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Man that sounds so hack, why would you have to silicone anything? God damn 4strokes. Want to hear my opinion, sell it and buy a 250 smoker.
The honda revolution continues!
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February 19th 2010 at 7:29 AM
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MX86
What's this button do?
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753 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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Actually more important for us to have our cases sealed tight since they are pressurized and that is how our fuel flows into the cylinder 
Living Life 1 berm at a time.
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February 19th 2010 at 4:04 PM
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Savage-CR
Savage
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153 Posts
Group: Members
Member Since: November 26th 2009
Current Dirtbike: I change this too much
Sponsors: Tosca Banquet Hall
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Whats wrong with using a good ole gasket?
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February 19th 2010 at 5:26 PM
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Dekk
Above Average Member
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657 Posts
Group: Members
Member Since: June 18th 2008
Location: Hawarden, Iowa, USA
Current Dirtbike: Kawasaki KX250F
Race Number: 25
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Quote originally posted by MX86
Actually more important for us to have our cases sealed tight since they are pressurized and that is how our fuel flows into the cylinder
So thats the reason mine runs bad. Got a slow leak, need a new shifter seal.
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February 19th 2010 at 6:14 PM
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MX86
What's this button do?
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753 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 Suzi_Rider
Quote originally posted by MX86
Actually more important for us to have our cases sealed tight since they are pressurized and that is how our fuel flows into the cylinder
So thats the reason mine runs bad. Got a slow leak, need a new shifter seal.
not necessarily... your problem is in the transmission part of the cases, (separate from the crank.) Now if it was a crank seal then it would run like **** and more then likely blow the top end
Living Life 1 berm at a time.
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February 21st 2010 at 4:13 PM
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1down5up
registered clutch abuser
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63 Posts 
Group: Members
Member Since: August 23rd 2009
Location: Forest lake, MN
Current Dirtbike: 99 yz one two five
Sponsors: me
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No manufacturer in their right mind would use silicoln to seal the case halves. It probably developed a small leak and the former owner smeared it on there in a half assed attempt to fix it. Silicoln by itself won't stick very long where petrolium products are introduced. It eventually gets soft and looses its adhesion ( just like you've witnessed).
If you don't want to split the case you could run down to the local hardware store and pick up some 3-bond. or go to a yamaha dealer and get some yamabond. Clean up the area very good with some carb cleaner and try smearing it around while trying to push it into the case where the leak is.
Wether it will work or not, I don't know. It's the best idea I can come up with.
If you can't afford a new four stroke, you can't afford a used one either!
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February 22nd 2010 at 6:47 PM
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rmz-rider
Starting Member
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20 Posts
Group: Members
Member Since: January 26th 2010
Location: Ontario, Canada
Current Dirtbike: 05 kxf 250
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Quote originally posted by butcher_boy
No manufacturer in their right mind would use silicoln to seal the case halves. It probably developed a small leak and the former owner smeared it on there in a half assed attempt to fix it. Silicoln by itself won't stick very long where petrolium products are introduced. It eventually gets soft and looses its adhesion ( just like you've witnessed).
If you don't want to split the case you could run down to the local hardware store and pick up some 3-bond. or go to a yamaha dealer and get some yamabond. Clean up the area very good with some carb cleaner and try smearing it around while trying to push it into the case where the leak is.
Wether it will work or not, I don't know. It's the best idea I can come up with.
thats what i am planning on doing, i hope it works out!
i might try to sell the bike in the spring.
but i would like to make sure it will be ok for the next owner, i dont want them feeling like i am now!
SOLD 2005 kx 250f.
- pro circuit ti-4 full exhaust
- pro circuit water pump system
- hinson clutch
wishing i could buy a new bike!
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