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2005 YZ 450F with roasted motor
- Wondering why it would do that?
started by Rhythm
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February 28th 2009 at 5:25 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 bike was listed on Kijiji for the longest time but I can't find the add again to show you guys.
It was a 2005 YZ 450 F that had burn down and was in need of $1800 motor work. He said that it leaned out putting a hole in the top of the piston. Now for me that seems a little sketchy because I've never heard of a four stroke running lean and buning down, but I don't know if it is possible or not.
I would imagine if it did lean out, it would have damaged the valve, lifters, etc. also.
What might be other reason that these motors might burn down?
'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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February 28th 2009 at 10:37 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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i seen an XL175 motor with a hole in the top of the piston from running the wrong plug, the plug was too long and punched a hole right in the top of the piston.
2002 Honda CR250R
1986 Honda XR100R
2002 Honda CR125R(SOLD)
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March 1st 2009 at 7:30 AM
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James125
Smokers Rule
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120 Posts
Group: Members
Member Since: June 18th 2008
Location: wasilla, ak, USA
Current Dirtbike: 03 yz 250
Race Number: 357
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Running lean will cause a hole in a piston and burnt exhaust valves when it runs lean it runs very hot and can burn a hole in the piston or can cause it to size up. Like mx4life said the wrong plug will cause this to if its to long or to hot of a plug.
Preignition and detonation will cause it too if he was running to low of an octane fuel.
$1800 sounds like a lot maybe $800 for a rebuild.
03 yz250 has a few bolt ons!!
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March 1st 2009 at 10:21 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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depending on damage and parts needed to be replaced. 1800 is not a far off guestimate....
Living Life 1 berm at a time.
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March 1st 2009 at 11:06 AM
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James125
Smokers Rule
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120 Posts
Group: Members
Member Since: June 18th 2008
Location: wasilla, ak, USA
Current Dirtbike: 03 yz 250
Race Number: 357
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Yea maybe I never owned a 4 stroke the most I ever spent was around $600 that was for a new crank, piston, rod
got to love those cheap smokers.
03 yz250 has a few bolt ons!!
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March 1st 2009 at 11:20 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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if he needs a new head. you might as well part it out...
Head, Cam, Cam Chain, Valves, Springs, Piston, Gaskets + probably take it to a shop being how most people don't know how to work on modern 4 strokes = Mucho Greeno!
Living Life 1 berm at a time.
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March 1st 2009 at 3:33 PM
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Kawi_Rider_316
Team Not Even Scared
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632 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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Thats why I trade every year ha ha... Those 4-strokes are handy until they blow up. I havent blown one up yet and Im hopin not too!
"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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March 2nd 2009 at 9:36 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 MX86
if he needs a new head. you might as well part it out...
Head, Cam, Cam Chain, Valves, Springs, Piston, Gaskets + probably take it to a shop being how most people don't know how to work on modern 4 strokes = Mucho Greeno!
Ya see thats what I mean, I was looking at buying it and fixing the motor cuz it was going of $2200 cdn obo which even with the cost of parts I would have paid way less then a running one of the same year, but after thinking about it for a few days decided it would be a headache to do yourself and for someone else to do it i wouldn't end up ahead at all.
'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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March 2nd 2009 at 10:19 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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I had to take 17 hours of training to work on them. it's no fun. and takes a lot of patience.
Living Life 1 berm at a time.
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March 3rd 2009 at 9:00 AM
[ Modified March 3rd 2009 at 9:01 AM
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StudentDriver
New Member
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67 Posts 
Group: Site Supporters
Member Since: October 10th 2008
Location: Boise, Idaho, USA
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Quote originally posted by MX86
if he needs a new head. you might as well part it out...
Head, Cam, Cam Chain, Valves, Springs, Piston, Gaskets + probably take it to a shop being how most people don't know how to work on modern 4 strokes = Mucho Greeno!
Quote originally posted by James125
Yea maybe I never owned a 4 stroke the most I ever spent was around $600 that was for a new crank, piston, rod
got to love those cheap smokers.
This really illustrates my 2 stroke thinking,
but the 2 vs 4 is better off for another topic.
That $1,800 is alot,
but it's about right for what it will run on the 4 strokes.
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March 4th 2009 at 7:35 PM
[ Modified March 4th 2009 at 7:39 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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^^^Yes thats why I went back to a two banger two years ago because for the most part I'm only trail riding now, and don't need the expences of rebuilding a fourstroke at some point. I do miss the fourstroke thumper I had last and wouldn't have minded getting another one for cheap to have for a back up or so I could pick which bike fit the ride I wanted to do that day.
'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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