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Enduro Intake/Carburetion - 2 stroke Jetting, Reeds, Air Filters, etc.


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  #1  
Old 06-29-2009, 01:40 PM
reiterrider's Avatar
reiterrider reiterrider is offline
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Default Summer jetting for the pacific Northwest

My bike is not running as well as it was this winter/spring.
The current weather is in the 70's
The idle won't come down when I come to a stop.
It feels like I'm having to really fan the clutch allot while I'm climbing or I'm getting out of a hole.
Overall the bottom end is not as good and I'm really having to work the clutch more that I use to.

Here are my current settings:
Bike year & model = 2003 EC-250
Temperature (degF) =50f - 85f
Elevation (feet) =0-3500
Main jet = 175
Pilot jet =40
Needle & notch = EG 2rd clip
Air screw setting = 2
Throttle valve/slide = #6

Should I make some adjustments on my current setup or pony up and get an LTR Kit?

Howie


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Howie

2008 KTM 530

Former Fantasies:
2007 KTM 525
2004 Honda CR250R
2011 Gas-Gas EC 300
2009 KTM 300 XC-W
2004 KDX 200
2000 KDX 220
2003 Gas-Gas EC 250
2004 Honda CRF 250X
2005 Honda CRF 250X

What can I say, I'm schizophrenic and ambidextrous!
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  #2  
Old 06-29-2009, 02:37 PM
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2 strokes 4 life 2 strokes 4 life is offline
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I would say to get a #8 slide and you would be set. I ride in very similar conditions with N1EF at # 2 from top, 175 main, 35 pilot, 2 turns out air screw, and #8 slide.
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Old 06-29-2009, 03:14 PM
jostby jostby is offline
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I can't figure out how you all can jet so lean when I'm running 48 pilots and 180 mains on both my bikes with little to no smoke when warm. I run LTR needles middle notch on both (-0 needle I think)
reiterrider, are you sure you haven't developed an air/intake leak?
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jeff

'00 XC250 (mine)
LTS front and rear suspension, power valve cover, carb jet kit and rear chain glide, RB Designs head mod, BRP tall triple clamp, backyard foot-peg lowering conversion.
'04 EC250 (the kids)
(he can do his own mods haha!)
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Old 06-29-2009, 04:47 PM
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reiterrider reiterrider is offline
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Air/intake leak, what's that look like?

BTW I have plenty of smoke and about 3"-4" of spooge on the pipe.
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Howie

2008 KTM 530

Former Fantasies:
2007 KTM 525
2004 Honda CR250R
2011 Gas-Gas EC 300
2009 KTM 300 XC-W
2004 KDX 200
2000 KDX 220
2003 Gas-Gas EC 250
2004 Honda CRF 250X
2005 Honda CRF 250X

What can I say, I'm schizophrenic and ambidextrous!
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Old 06-29-2009, 06:23 PM
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HydroDog HydroDog is offline
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Your pilot and main look right, I'm not sure about the needle. Is there any more info on it than EG?
Might also pull off the pipe and power valve cover just to make sure the valve is closing all the way.
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  #6  
Old 06-30-2009, 07:42 AM
jostby jostby is offline
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Quote:
Originally Posted by reiterrider View Post
Air/intake leak, what's that look like?
intake boot between the carb and rad valve may have developed a crack, it is also possible to start sucking air at the crank seal behind the flywheel and stator but could be as minor as some dirt in the passages inside the carb. Your symptoms sound like it's started running lean.
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jeff

'00 XC250 (mine)
LTS front and rear suspension, power valve cover, carb jet kit and rear chain glide, RB Designs head mod, BRP tall triple clamp, backyard foot-peg lowering conversion.
'04 EC250 (the kids)
(he can do his own mods haha!)
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  #7  
Old 06-30-2009, 09:38 AM
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Skidad Skidad is offline
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With the warmer temps the bike should be richer but you have lean symptoms (loose pilot jet?). Pull the carb and clean everything really well and blow out with compressed air. Check the airboot and reed cage rubber very carefully (check reeds as well) and tighten clamps and mounting screws. Take your crank case vent hose and submerge it in a small bucket of water and rev the motor. Lots of bubbles indicate a leaking ignition side crank seal. You can also spray some carb clean at different areas while the motor is running and see if the RPM's change which would indicate an air leak. A #8 slide will just make it worse until you find the actual reason why it's happening. Once you figure it out the #7 or #8 slide will improve low speed response and spooge factor.
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  #8  
Old 07-08-2009, 12:58 PM
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reiterrider reiterrider is offline
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Red face Broken gas filter

I didn’t have time to trouble shoot the issue with my bike last week.
So I brought a can of carb spray with me on my ride this last weekend.
I sprayed the carb and surround areas, no luck.
They I sprayed it again with more material.
Nothing happened, then I just stared at the left side for about a min, all of a sudden the inlet for the plastic fuel filter popped loose from the filter. It was about 85% broken off and just barely hanging on. Of course gas started to spew everywhere. Luckily I had a spare fuel filter in my tool box and viola, it was fixed, at least the issue with climbing and fanning the clutch to get it off the line.

It still has an issue with high idle after it is warmed up and when I come to a stop.
I have a new jet kit from GoFasters that I will install and test this week.
Thanks to all who responded!
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Howie

2008 KTM 530

Former Fantasies:
2007 KTM 525
2004 Honda CR250R
2011 Gas-Gas EC 300
2009 KTM 300 XC-W
2004 KDX 200
2000 KDX 220
2003 Gas-Gas EC 250
2004 Honda CRF 250X
2005 Honda CRF 250X

What can I say, I'm schizophrenic and ambidextrous!
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  #9  
Old 07-08-2009, 03:40 PM
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Skidad Skidad is offline
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The Ethanol in gas is causing problems in all sorts of ways. Fuel filters being one of them. Not sure if that's the cause of your failure but certain filters it seems to be attacking and breaking down the filter material, then it gets into the carb and clogs things up. Not good, especially if you have a thumper with the FCR carb.
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