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Poping and banging
- 4 stroke
started by Dekk
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October 22nd 2010 at 11:13 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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Is it normal for a 4 stroke to do a lot of cackling and back firing in cold temperatures? (70-60 degrees). Or is my mixture screw completely messed up?
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October 23rd 2010 at 12:07 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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Cold air is more dense but 60-70 is not cold but thats just to me Backfiring and popping is from a lean condition so colder the air the leaner your bike will run. Do you have a fuel screw tinker with that to rinchin it up.
03 yz250 has a few bolt ons!!
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October 23rd 2010 at 6:57 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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it's normal for a 4 stroke to do that with a aftermarket exhaust. but i'd richen up that fuel mixture screw
Living Life 1 berm at a time.
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October 23rd 2010 at 10:16 AM
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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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what they said. if it was doin it this morning could be because the air is so dense and chilly. do you have one of those easy adjust fuel screws on there?
"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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October 23rd 2010 at 12:36 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 have a mixture screw on the carb but I have no idea how to use it...
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October 23rd 2010 at 6:12 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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just let it idle and then twist your throttle wide open. then go in out a till you feel it click to next notch and do it again, keep doing that until there isn't and bog. Thats what I do. Sometimes you have to go in with it but in your case im gueussing your lean so go out to richen it up. let me know if that helps
"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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October 23rd 2010 at 7:47 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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Ok, how do I know when to turn it back down?
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October 24th 2010 at 2:52 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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go 2 clicks out
Living Life 1 berm at a time.
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October 24th 2010 at 5:22 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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mines typically more than 2 clicks. I would start at two clicks and go out. when it seems like its good throttle response with no bog leave it there, if you keep going and it gets worse go back in with it until it gets better. like i said though start at two clicks and rev it up if it bogs turn it out a bit and try it again, keep doing that until it seems to have good response with no bog, or as minimal as possible. you shouldnt have to turn it out too much. ill send ya a text 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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October 24th 2010 at 7:32 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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Thanx a bunch guys 
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