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YZ Rebuild
- Top End
started by Savage-CR
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May 24th 2010 at 8:30 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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I figured that because there is absolutely nothing going on around here these days that I would make a thread about doing the top end on my recently acquired 1998 Yamaha YZ250.
I was out riding this weekend and all was good until I had no powerband. The bike would have tons down low but it just fell on its face in the higher RPM's. Upon disassembly I found that the power valve wasn't functioning due to a screw coming out and a piece breaking clean off. I also found a piece of the piston is stuck to the cylinder. I don't have pictures of the cylinder because the camera isn't good enough for all those up close pictures but here is what I have.
 Broken piece from powervalve  Baby in pieces  Everything apart
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May 24th 2010 at 9:18 PM
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Dekk
Above Average Member
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665 Posts 
Group: Members
Member Since: June 18th 2008
Location: Hawarden, Iowa, USA
Current Dirtbike: Kawasaki KX250F
Race Number: 25
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Lookin good. Sucks you have to do a rebuild already, but its better now than mid season
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May 25th 2010 at 6:27 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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Yea I guess so haha. The only thing I'm worried about is the piece of piston stuck to the cylinder. If I have to get it Nikasiled than I won't be able to put a piston in it for a couple more weeks.
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May 25th 2010 at 4:01 PM
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zdawg
New Member
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69 Posts 
Group: Members
Member Since: March 4th 2009
Location: Canada
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How much do you think its gonna cost? My friend bought a yz85 about a month ago, he let me ride it and it blew up within the first 3 or 4 hours. Its gonna cost him around $850 haha. It sucks man, but theres not much you can do I guess.
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May 25th 2010 at 6:47 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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A top end shouldnt cost more than a couple hundred. If his was 850 on a small bike he musta had to put a crank or crank bearings or somthing in it.
"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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May 25th 2010 at 8:10 PM
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zdawg
New Member
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69 Posts
Group: Members
Member Since: March 4th 2009
Location: Canada
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Quote originally posted by Kawi_Rider_316
A top end shouldnt cost more than a couple hundred. If his was 850 on a small bike he musta had to put a crank or crank bearings or somthing in it.
Yea he needed a new crank, crank bearings, piston, rings, and cylinder. Im not sure what else.
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May 25th 2010 at 8:41 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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The cylinder is going to be sent to Quebec tomorow for Nikasil. Its going to be about $325 for the cylinder.
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May 25th 2010 at 8:48 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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Sh!tty buzz but hopfully she'll run better once all is said and done.
2002 Honda CR250R
1986 Honda XR100R
2002 Honda CR125R(SOLD)
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May 26th 2010 at 6:04 PM
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Dekk
Above Average Member
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665 Posts
Group: Members
Member Since: June 18th 2008
Location: Hawarden, Iowa, USA
Current Dirtbike: Kawasaki KX250F
Race Number: 25
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how did your bike do against mx's
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May 26th 2010 at 6:26 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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Never really put them together. It will definately have to happen when my bike is good to go though haha.
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May 26th 2010 at 7:36 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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Quote originally posted by Savage-CR
Never really put them together. It will definately have to happen when my bike is good to go though haha.
Bullsh!ter, i pawned  no, just kidding, but i was definetley faster on the track.
2002 Honda CR250R
1986 Honda XR100R
2002 Honda CR125R(SOLD)
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May 26th 2010 at 10:57 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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track is 90% rider 10% bike once you are past the starting gate. No offense but the 250 when tuned right will walk all over you or "Should"
and holy ****? 325 for a nickasil job? wow... only 150 in the states :/
Living Life 1 berm at a time.
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May 27th 2010 at 12:19 PM
[ Modified May 27th 2010 at 12:21 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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There are only 2 places in Canada that do it supposedly. I should have the cylinder back in 10-15 days.
MX was definately faster on the track, but I think I did alright for being 250 pounds and only been on 2 wheels since October of 2009.
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May 29th 2010 at 7:00 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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What is a good piston to put in my bike? Its going to take a couple pay day's before its done anyways so I want to put a good quality piston in it.
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May 29th 2010 at 11:08 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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Wiseco works really well for me. also helps the bike rev slightly quicker
Living Life 1 berm at a time.
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June 2nd 2010 at 3:31 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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Pro-X piston was ordered for my bike. Along with the gaskets and powervalve parts that I need. Hope to have this POS together soon.
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June 25th 2010 at 2:56 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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Well I have the cylinder and everything is back together except for the head, powervalve, and countershaft seal. Hoping to see the powervalve parts on monday. Grand total so far: $850 and I still owe just under $100.
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June 25th 2010 at 4:41 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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still better than rebiuldin a 4-stroke ;) ha ha
"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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June 25th 2010 at 7:13 PM
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Dekk
Above Average Member
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665 Posts
Group: Members
Member Since: June 18th 2008
Location: Hawarden, Iowa, USA
Current Dirtbike: Kawasaki KX250F
Race Number: 25
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how much would a 4 stroke cost to rebuild?
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June 25th 2010 at 9:58 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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That all depends what you do. Easy $200 for piston, rigns, gaskets. Couple hundred for valves, couple hundred for springs. couple hundred for each cam. So it depends what you get, and if you go with aftermarket, you can start bout' doubling the cost. It adds up real quick. I think when I did my honda it was like $1200, with Pro Circuit parts with my racing discount.
"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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July 6th 2010 at 10:23 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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Anyone know how far out my fuel-air mixture screw should be? I was checking out the carb and its only out about 1/4 turn. My main jet is also a 170. Didn't check the needle or pilot though yet. Once my bike is broken in I need to change my jetting up a little bit as my bike runs really rich and boggles mid range.
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July 6th 2010 at 4:59 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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The first start video is on my Facebook and will soon be on youtube for those of you who are interested.
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July 6th 2010 at 5:11 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 Savage-CR
Anyone know how far out my fuel-air mixture screw should be? I was checking out the carb and its only out about 1/4 turn. My main jet is also a 170. Didn't check the needle or pilot though yet. Once my bike is broken in I need to change my jetting up a little bit as my bike runs really rich and boggles mid range.
Mines about 1 3/4 right now. try 2 and work from there
Living Life 1 berm at a time.
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July 6th 2010 at 5:29 PM
[ Modified July 6th 2010 at 5:29 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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Which way is richer and which way is leaner? It won't start now after the first start and my foot is really sore from the insane compression.
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July 6th 2010 at 6:19 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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In is leaner out is richer.
"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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