KX Riders
Maintenance & Technical => KX250 / KX125 => Topic started by: Shane3004 on January 12, 2014, 10:32:09 AM
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Wel lads was out on my kx 2day and noticed dat when i was in the forest, goin slow around trees and gettin stuck here and there the bike got a bit smokey, and when i get bak to the road and drive it on it spluttes a bit and clears its self out, It starts fine and runs wel on the roads, no smoke, just when i slow down, it has a fresh rebuild, jetting seems good, and the mix is 32:1, i think its a build up of oil when i go slow, what yous think? Thanks
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I think if you pull the spark plug you should know.
When you rebuilt it did you go larger on the bore?
What year is your bike and what is the jetting?
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Its a 96, standard bore, got the head replated, jeting is, slow jet 42, main jet 162 and needdle is second down from top, i tryed the neddle at 3rd down, but it wasent as snappy on the throttle, plug looks a bit oily and black, it has a full pc exhaust, im at sea level as well if dat makes a differents, it runs perfert and starts handy enough hot or cold?
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It could be burning gearbox oil/ right hand crank seal or case joint.
What sealer did u use on the cases?
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I doubt it cause theres new all balls racing bearings and seals gone in and i used black gasket sealer, it real gud, it about €40 tube here in ireland. And if it was dat it be a lot more smokey! I tink its not buring hot enough when driving easy, and causes a build up, im not sure wat to try doh!
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What air filter did you use?
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this might not have anything to do with it...but...how's the packing in the silencer?...if it's saturated with black spooge, then it wouldn't hurt to repack it.
I had a 250 that suddenly started smoking like a forest fire a few years ago....changed the saturated packing with some fresh new stuff, and it was all set.
As the exhaust gets hot/hotter, all that black kucka starts to slowly burn/smolder, causing it to smoke excessively...worth a check :?
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this might not have anything to do with it...but...how's the packing in the silencer?...if it's saturated with black spooge, then it wouldn't hurt to repack it.
I had a 250 that suddenly started smoking like a forest fire a few years ago....changed the saturated packing with some fresh new stuff, and it was all set.
As the exhaust gets hot/hotter, all that black kucka starts to slowly burn/smolder, causing it to smoke excessively...worth a check :?
i thought the same..old silencer-packing soaked with unburned 2stroke-oil.. repack the silencer and the smoking could be gone...
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Theres a twin airfilter in her, now dat u mention the exhaust packin, it is after gettin a bit louder lately, and after a spin the mud gaurd wud be a bit black from the exhaust, i,l try it doh and let ya,s no! Sound lads!
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Ok, two things.
Those two stage oil filters are easy to over oil which makes your bike run VERY rich.
Take the oil filter out and clean it and make sure you use a light coat of oil.
Then, pull your muffler apart and make sure that the packing is good.
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based on what you said: going slow in the forest and when you lowered the clip it didn't run good I would say your jetting is to rich, pilot and/or needle. the good old idle screw will cover lots of jetting issues up, keep screwing in until it idles and usually when you first start it up it races for a bit = to rich down low.
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While your at it, take the pipe off and get it real hot with a torch. Burn all the old oil out of it.
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Ya i soaked the filter in airfilter oil and rang it out and let it dry, but mite be to much, i clean it off and c how i go, the idle screw is broken cause it makes no differents, but like i said it starts grand, and doesent rev up when started, just a bit if the choke was on but dats normal, if i heat the header pipe wit gas torch wud it dis colour the exhaust? Is there any stuff i can pour in to soften the old 2stroke oil? One more question, can i buy jets single or do they come in a set? And if so were, and wud post world wide, kx parts are hard to get here! :x
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tt may be also worth checking the choke plunger [may be not fully closing dirt etc}
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I have never had trouble with it turning them colors. Start with pointing the torch inside the pipe. There may be a couple flames jump out, but usually only an inch or so. You will see the oil burning out way before it gets hot enough to turn colors
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don a can ken that one like mine is racin when I first start it up then calms down im replacing my jettin see what happens :roll:
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don a can ken that one like mine is racin when I first start it up then calms down im replacing my jettin see what happens :roll:
this is a common kawasaki issue, back when we raced two stokes it was always time consuming to get the jetting right, usually about 5 needle sizes, a needle is like a clip or half a clip difference, sometimes a slide change and always jet changes. As Motorrad stated only use Kehin jets, each jet is flow tested, others who knows. usually your bike is always a little bit lean on start up and may rev a little high till warmed up, but if you have to hurry to shut off your choke your probably to rich right off the bottom
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yea rushin to shut off the choke straight away im gunna renew the jettin anyway cos its got signs of ware n tear never been changed since 94 a think althoe some of them ones on ebay look toasted lol.. :roll:im tryin to find a carb kit ..
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Lads were on the net can i get jets? Do ya buy them on there own or in a set?
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lol looks like its jd jet kit that's what get recommended so much on this so we all best use the same kit plus is sounds great spec ,the needles look nice n strong n fine ,james dean jetting kit not sure if thers any relation like great name :roll:
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http://www.keihincarbs.com/home.html
http://www.keihin-na.com/
http://www.sudco.com/keihin.html
http://www.pjmotorsports.com/keihin-fcr-carburetors.html
http://www.concom1.de/
...now you can choose, where you buy your needed genuine keihin-jets and carb-parts... :wink:
(google is always the first great help... 8-).. )
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james dean jetting kit not sure if thers any relation like great name :roll:
are you afraid your needle might end up being a sausage link?! :lol:
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u love a sausage sarnie ha them jd kits look good like wich carbs are best makuni or keihin :roll:
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nah...I prefer a taco supreme 8-)
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u love a sausage sarnie ha them jd kits look good like wich carbs are best makuni or keihin :roll:
look around, which carb is mounted in the most stock dirtbikes since 88... 1. keihin... 2. mikuni... 3.del ̣rto (older european bikes)
thats the answer to your question... ... and the good,but expensive aftermarket carbs like apt smart carb and lectron..
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thanks motopunk and taco whacko dude wat does a corn dowg taste like :roll:
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wat does a corn dowg taste like :roll:
I wouldn't know, never had any desire to try one....it's a little disturbing why you "want" to know.
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im disturbed little corndowg with a fettish for kxs :evil: