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Enduro Intake/Carburetion - 2 stroke Jetting, Reeds, Air Filters, etc. |
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#1
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2003 EC250 jetting changes- effect of slides
So, see my new to me gas gas thread here.
In the process of stripping the bike down and putting all back together I observed the following- Jetting was- Slide #6 48 idle/pilot Unknown needle (LTR?) see below in highest (leanest) slot 180 main Bike had Messico Pipe with No PV cover mods. Some aftermarket reed it appears. Otherwise mods unknown. Didn't get a chance to ride it this way. My jetting I liked in my MC250 and plan on trying out on the EC250 was/is- Slide #7 42 idle/pilot DDK needle middle slot 180 main Bike has Messico Pipe with bigger PV cover mods. Some aftermarket reed it appears. Otherwise mods unknown. Will ride in next few days. What is the effect of the #6 slide? Should I consider trying it out? Should I be worried about going from 48 to 42?
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2003 EC250 w/ Ohlins pkg Sometimes you eat the bear, sometimes the bear eats you. |
#2
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personally I wouldn't change any of the jetting, slide, or needle until I tried it out first. It might run fantastic with that setup. My XC250 runs great with #7 slide, 180 main, 48 pilot and LTR needle but if you look at what everybody else is running it isn't even close.
All this is simple to change. If you don't try it out before you make so many changes won't you always wonder how it would have performed? Same for the flywheel weight.
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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!) |
#3
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Forgot to add pics of mystery unmarked needle..
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2003 EC250 w/ Ohlins pkg Sometimes you eat the bear, sometimes the bear eats you. |
#4
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The mystery needle is an LTR needle - In the past, Les removed the numbers to protect it from being copied.
FYI - The jetting can vary from bike to bike as the nozzle wears - and on this bike it seems to wear quickly; Ron at RB-Designs is the only place that I know of that can replace it for you. The nozzle is not available from Keihin and he machines one up for the application. jeff |
#5
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What does the nozzle wearing do? I am still gonna try my jetting before I go to anything else.... So what does the slide change?
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2003 EC250 w/ Ohlins pkg Sometimes you eat the bear, sometimes the bear eats you. |
#6
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The needle seats in the nozzle. As the throttle opens the needle raises and the size of the nozzle combined with needle taper is what provides the progressive fuel supply. A worn nozzle will start to get egg shaped and and precise fuel delivery suffers. It makes trying to get clean jetting almost impossible. The slide size.. I'm pretty sure I read that the number of the slide (6, 7, 8, etc) is the measurment in millimeters of the opening when the slide is fully seated. A #8 slide will allow more air flow at idle than a #6. To get a little more convoluted I think I remember that GG modified slides at one point and made a 7.5? Can't remember if they marked them with an engraving tool or something? I think most GG 250 come with a 7 but some say the #8 works better in their conditions. Both my bikes have 7's. Also concerning my odd jetting on my XC, I bought this bike new and it would foul plugs every ride. Les at LTR is the person that set me up with the 48 pilot. He recomended the 175 main but the 180 worked better so it wasn't a case that my carb was worn out that I went with this combination.
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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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2003 EC250 w/ Ohlins pkg Sometimes you eat the bear, sometimes the bear eats you. |
#8
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As you go to higher number slide it effectively leans out primarily the 0 to 1/4 throttle range, with diminishing effect up to 1/2 throttle.
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Eric K '06 GasGas EC300 '01 GasGas XC300 |
#9
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This setup worked ok. However it felt ugly in the middle and wasn't clean. Raised the float to 18mm (thought that might be part of the problem) and then raised the clip on the DDK (lowering the needle one slot). Bike rips. Final- 65 degrees and a little humid Slide #7 42 idle/pilot (2.5 ish turns out on air screw) DDK needle top middle slot 180 main PS- as far as I can tell there is no difference between the DDK and the LTR needle. Les told me they were the same on the phone, so I looked at them together today real close like. Four people I actually had look at it, nobody could tell them apart.
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2003 EC250 w/ Ohlins pkg Sometimes you eat the bear, sometimes the bear eats you. |
#10
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50 degrees and clear Slide #7 48 idle/pilot (2 turns out on air screw) DDK needle top middle slot 180 main
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2003 EC250 w/ Ohlins pkg Sometimes you eat the bear, sometimes the bear eats you. |
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