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Jetting
started by Savage-CR
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August 3rd 2010 at 11:07 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 figured since there is nothing going on here I might as well start something about jetting my bike. My bike currently has a 170 main, 42 pilot, 4th needle clip, and 1/4 turn out on the fuel/air screw. The bike runs rich as hell and floods out mid rpm. So what I had planned on doing was moving the needle one step richer (3rd position) and leaning it out on the main. Sound right? What about the pilot and fuel/air screw? I know the pilot doesn't change much but I'm stumped as to what to do with the fuel/air screw to get everything right.
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August 5th 2010 at 12:03 AM
[ Modified August 11th 2010 at 10:10 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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I run a 178 main with a 48 pilot and the needle clip in the 3rd position (middle grove)
Living Life 1 berm at a time.
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August 5th 2010 at 1:01 AM
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Kawi_Rider_316
Team Not Even Scared
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620 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 go richer with your needle. Move the clip up, so the needle drops down to lean in out more. I would start with that. Then go to your main and pilot.
"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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August 6th 2010 at 10:22 PM
[ Modified August 6th 2010 at 10:43 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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So far all I have done is back the air/fuel mixture screw out to 1 1/4 turns to see what the change is. I went to a pit today and road it but I don't think was much difference. The lower the number of jet the smaller it is, correct?
EDIT:
I just did a plug chop on todays plug and it appears to be running mint. I'm going to do another one on this plug next ride. What else would cause the mid-range boggle?
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August 7th 2010 at 12:06 AM
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Kawi_Rider_316
Team Not Even Scared
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620 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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Lower number means the hole is smaller, therefore it would be a leaner jet.
"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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August 7th 2010 at 10:42 AM
[ Modified August 7th 2010 at 10:52 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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How am I supposed to check the pilot jet? I want to get rid of this boggle but am starting to think the main and needle are fine. I would get a picture of the plug but I fell on the camera at the end of the ride and it no longer works haha. Fixed the camera 
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August 7th 2010 at 11:37 AM
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Kawi_Rider_316
Team Not Even Scared
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620 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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for low end you adjust your pilot. middle power adjust needle. and for three quarter to full adjust main jet. What are all your settings at right now? or are they still the same as your first post?
"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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August 7th 2010 at 11:56 AM
[ Modified August 7th 2010 at 11:56 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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The only thing different now is the fuel/air screw which is now at 1 1/4 turns out. I have a 42 pilot and 170 main in it now with the needle in the 4th position (one leaner than the middle). I was given a 38 pilot and 160 main but have yet to put them in because I think a 160 is a lot leaner than what I need. I'm starting the think the main is fine from what that plug looked like.
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August 7th 2010 at 2:20 PM
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Kawi_Rider_316
Team Not Even Scared
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620 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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where was the clip to start with. and does the bike pop at all or just boggy?
"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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August 9th 2010 at 10:00 PM
[ Modified August 9th 2010 at 10:01 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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POPPY haha thats the word for it. Its not boggy at all. The only thing I have messed with is the fuel/air screw.
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August 10th 2010 at 12:45 PM
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Kawi_Rider_316
Team Not Even Scared
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620 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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If its popping you are most likely lean. I dont mess with the 2 strokes to much anymore, so i dont know really what you should do with your fuel/air screw since the 4-strokes have a little different set up for that.
So your settings are currnetly
Pilot - 42
Needle - 4th from bottom?
Main - 170
Fuel Screw - 1 1/4 turns out?
"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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August 10th 2010 at 1:33 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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Yes those are my current settings. While its popping if I hold it at that rpm it will eventually foul the plug and the plug comes out black and slightly wet.
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August 10th 2010 at 11:30 PM
[ Modified August 10th 2010 at 11:44 PM
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Kawi_Rider_316
Team Not Even Scared
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620 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 try moving the clip to the 5th from bottom notch. So move the clip up one. Put a new plug ride it a bit and let me know the results and how the plug looks. That should lean it up a bit which sounds like your mid range is running rich which can usually be fixed by adjusting the needle.
"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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August 11th 2010 at 3:37 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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a 178 is the stock main.
There is something seriously wrong if you're running a 170 main unless you're at like 10,000 feet
Living Life 1 berm at a time.
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August 11th 2010 at 5:06 PM
[ Modified August 11th 2010 at 5:07 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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It used to drip a little bit of gas once in awhile but it hasn't done that in over 2 months. I figured needle and seat wre gone but it stopped so I didn't check. I'm at about 250ft.
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August 11th 2010 at 7:45 PM
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Kawi_Rider_316
Team Not Even Scared
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620 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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arent u runnin a 170 main mx?
"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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August 11th 2010 at 8:04 PM
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Kawi_Rider_316
Team Not Even Scared
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620 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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Also how dirty is your filter
"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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August 11th 2010 at 8:44 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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Cleaned after every ride.
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August 11th 2010 at 10:05 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 Kawi_Rider_316
arent u runnin a 170 main mx?
No i pulled my main tonight. it's a 178
Living Life 1 berm at a time.
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August 11th 2010 at 10:13 PM
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Kawi_Rider_316
Team Not Even Scared
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620 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 adjust your main then if your that lean. I do think your going to have to adjust your needle yet but start with the main and see. It would help if i had some stock settings but i cant seem to find any
"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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August 11th 2010 at 10:28 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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Stock is:
178 Main
50 Pilot
Looks like a N3VG needle in the 3rd clip
I'd run a 48 pilot and if you can find it a N3EW or N3EJ needle. I use the EJ in mine and it just flat out rips.
Living Life 1 berm at a time.
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August 12th 2010 at 12:39 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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