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More power out of my 250
- any suggestions
started by Dekk
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June 4th 2010 at 9:33 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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I would like to get some more power out of my KX. It has a Boysen quickshot and a FMF slip on pipe but thats about it. I would rather not tear into the motor. So any ideas?
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June 4th 2010 at 10:22 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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sell it and get a 250 2t or 450... The 250f's don't respond as well to pipes, you have to get a high compression piston and cam kit to see any significant hp gains, and with that runs the risk of having a grenade between your legs if you don't keep a eye on the motor
Living Life 1 berm at a time.
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June 4th 2010 at 10:22 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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The best mod out there. Change your sprocekt! Could get a header pipe... Without tearing into the engine your goign to be pretty limited. The Kawi carburators are pretty good stock so really not much to do there, just make sure its jetted correctly. I didnt notice a whole lot of difference with/without quick shot on Kawi. Honda it made a difference tho.
"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 4th 2010 at 10:39 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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Ha what do you run for sprockets?
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June 4th 2010 at 10:44 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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Stock front, which I believe is a 13. The rear for indoor I run 50, for outdoor a 48/49. On my 07 I ran a 50 on all outdoor and a 52 indoor. The 09' has much more bottom end than my 07' did. I would recomend a 50 sprocket on the rear, that was perfect gearing on my 07'.
"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 4th 2010 at 10:47 PM
[ Modified June 4th 2010 at 10:48 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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Ya I'll have to get one soon than. What do you have for aftermarket stuff on your bike?
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June 4th 2010 at 10:48 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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All I have is Hot Cams and suspension.
"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 5th 2010 at 9:49 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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I'm stock..... :)
Living Life 1 berm at a time.
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June 5th 2010 at 9:49 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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To the best of my knowledge, the Cams from Hot Cams do not require aftermarket valves or valve springs so that would be the easiest thing to do for some more power.
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June 5th 2010 at 2:45 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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Yea you can use stock valves and springs. Easy to put in... I didn't notice a dramatic increase with mine. That would be the next step I would take if I was you though. Could just be that you need new piston and/or springs/valves to freshen the engine up a little.
"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 5th 2010 at 4:04 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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a 250F is a 37 hp machine... unless you wanna big bore, it's all you're going to see...
250 is 45 hp stock form. with some mild porting and a pipe can see low 50's gotta love it LOL
Living Life 1 berm at a time.
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June 5th 2010 at 7:52 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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No its got plenty of life left in it. Previous owner never rode it
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June 14th 2010 at 10:25 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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You could take the screen outa the airbox and re-jet. I am in the process of doing that now.
"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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