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Enduro Intake/Carburetion - 2 stroke Jetting, Reeds, Air Filters, etc. |
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#1
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2003 ec300 lean/won't get on pipe
2003 ec300 seems to be running super lean.
Working at mates bike can't get it to run properly. Was bought knowing it wasn't right but took a chance. I suspected main jet had fallen out from sellers description. Pulled the carb, Floats were bent and main jet was rattling around the float bowl! Hoped this was the fix but sadly not... Carb is pwk38 as1 Jetting is 38 pilot 180main N1EF 3rd clip #6 slide Freshly cleaned and oiled filter. See level to 300m 10 to 15deg. Starts and idles ok won't get on the pipe and splutters over half throttle. After a short run the silencer is too hot to touch. Even the exhaust gas out the silencer at idle is uncomfortably HOT with no smoke. (Silencer freshly packed and not obstructed) Seems a bit low on compression compared to my 250 but this shouldn't cause lean condition would it? Checked for air getting in by spraying some carb cleaner around carb, engine and flywheel (cover off) at idle and get no change in engine speed or sound. Any ideas? My 2011 250 runs well. Over the same run up and down the road my exhaust is warm to the touch not hot and at idle the exhaust gas is verging on cool with a little smoke. Both bikes are using fuel from the same can. Cheers |
#2
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Check the power valve. Maybe sticking.
Ignition timing could be off too. |
#3
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I would check the needle isn?t bent so it?s partially blocking the jet and also you don?t have a kink or crimp in one of the hoses.
Good luck!
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Gas Gas 2018 EC250 Six Days - sold |
#4
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Power valve is resting on the stop and seems to move ok, ill maybe pop the cover off and check it operates.
Replaced all the breather hoses and fuel feed How do you verify ignition timing? |
#5
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Made a bit of progress last night.
Swapped carb over from my 2011 (AS2), its a good 10mm shorter so I cant get the airbox boot on, just wrapped some inner tube between the carb and boot. Bike sounds a whole lot better on the stand, seems to takes revs cleanly and I confirmed the powervalve is opening with this carb. Exhaust gas temperature is waaaay down too. Checked timing and the stator doesn't look like its been off as it has a rounded bolt! the special washer to lock the timing is also fitted. Hopefully get it out for a run later and see if its working as it should. Other than swapping all my jets and slide over is there anything can be done to diagnose a worn carb? Thinking a Chinese copy for 35quid is the way to go rather than something used that could have the same problems.... |
#6
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Check the dry side crank seal. Run the bike and spray wd40 or similar behind the stator.
Worn carbs get richer, not leaner! If it's running fine at low revs but struggles mid way, check for blocked main jet, condition of reeds (unlikely), and air leaks (centre case gasket, left side crank seal etc)
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2006 EC300 Enduro - Ignitech CDI - 38/NECW#2/165 FMF gnarly, FMF shorty, .50 front 5.7 rear 2016 RM-Z450 |
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