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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc. |
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#1
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Very poor idle
Hey guys
Just got my bike put back together and I'm struggling to get her to idle Basically I bought the bike as a fixer upper, I knew it didn't idle when I bought it but I thought a good clean of the carb etc and she would be fine Anyway 2 months down the line I've done a lot to it Completely rewired electrics, cleaned everything, full service and guess what it still idles like crap (Just checked Topend and decoked all fine) My carb is the stock carb for ec200 2002 (38mm?) Carb settings Needle NBHW (stock) 3rd clip Main - 175 Slow - 50 Slide 5 Anyone got any advice? Cheers Ken Sorry I'll go into a little more detail Idle screw screwed right in and I've got to turn out the adjuster on the throttle cable to keep it going yet when in riding the bike the revs hang and take a whole to drop down making engine braking none existent. I've tried a new idle screw and it's the same Carb off the bike I've screwed in the idle screw and it's lifting up the slide like it should!! Does this sound like the slow jet is wrong? Last edited by Kendog; 01-02-2015 at 12:09 PM. Reason: Added more info |
#2
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Most folks will probably recommend a smaller pilot. Try a 42, it seems to be commonly recommended. Have you done a compression test? It should be 180-190psi. Have you checked the squish? Ideally you want it to be 1.3-1.4mm and this may require machining of the cylinder head to correct.
Your bike is old enough there may be some wear on the needle jet. A number 5 slide is on the rich side, but the slide cutaway does not control idling. I've never been happy with the idle on mine. As long as it can mostly idle, that's all I need. I'm also getting something of a hanging idle, but it's more of a nuisance than a problem.
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2011 EC250E |
#3
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I've just ordered a jet kit with all different sizes
One thing I hate it's jetting Never checked the compression or the squish as I'm about to get this one sleeved and bored to factory spec then I'm going to check the squish. I do believe my problem is the jetting. Piston and rings are snug and new no slap etc Cheers Ken |
#4
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Your pilot jet is way to big. Like it was previously stated, put in a 42 and I'll bet the bike runs sweet.
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#5
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Yeh bud going for the 42 first after a little digging on the forum it's the norm
Wonder why he had it so big. Can't wait to get out on this thing. Pulls strong just ticking over and engine braking suck asse.... |
#6
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Engine braking on a 2stroke?!?!
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02 300ec- 50mm Marzocchi cc forks, 2010 plastic. Now a 250cc. |
#7
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Quote:
Buy the piston first and send it out with the barrel (this assumes there is damage and the bore needs rework). If the bore is OK then just replace the piston and rings. The piston is the wearing component. The plating can go the life of the bike if it is not damaged.
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2011 EC250E |
#8
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There is a little yes but when the bike won't drop the revs there is no engine braking more like engine still pulling lol!!
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#9
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Quote:
There is no damage to the plating just it's worn a little but I'm sure the piston that's in there is slightly larger than stock but I'll have to double check Cheers Ken |
#10
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On my '06 EC200, I have:
slow 45 main 175 needle N1*HW 2nd clip *'1' weird looking, like a mix of '1' with a small 'B' in front Looks like an upside down greek beta letter Slide #6 I should add that squish is 1.2mm iirc and boyeson carbon fibre type reeds. I get the same thing having to wind the tickover right in whatever slow jet size is used. It generally needs to warm up a little to tick over properly, suggesting being a touch on the lean side on the slow circuit (and could probably sort that on the mixture screw), otherwise runs great. I believe Lancourt is a popular choice for cylinder repair, both UK and overseas.
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'00 Montesa Cota 315R '13 Husaberg TE 300 |
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