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05-28-2007, 07:53 PM | #1 |
Join Date: May 2007
Location: Illinos USA
Posts: 12
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Loncin 150cc / KTM clone
Has anyone bought one of these off of ebay? I'm having problems jetting mine. What's the secret? Mine seems to be running rich. I'm down to a 90 main jet, best it's run, but not good enough. A 87.5 main jet gets worse again. Could it be electrical?
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05-28-2007, 09:33 PM | #2 |
Join Date: Oct 2006
Location: Central Ohio
Posts: 289
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Couldn't find any Loncin 150's on ebay -- do you have a link to what it's like?
What problems are you having with it --- have you confirmed it's running rich looking at your spark plug?
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'20 RPS Magician 250 '06 Hensim (Tierra) DB150-2 '06 X-Treme 70cc pitbike '02 Kawasaki KX125 |
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05-28-2007, 09:50 PM | #3 | |
Join Date: May 2007
Location: Illinos USA
Posts: 12
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05-29-2007, 12:08 AM | #4 |
If the problem is present at idle and not at 1/2 to full throttle I don't believe your problem is the main jet, as most of these bikes use a slide/needle carb. Check the tech section for tips on adjusting the needle clip height, which will probably better the carb's performance.
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05-29-2007, 12:16 AM | #5 |
Of course the previous post is moot if it's not a slide. If it's a CK style Keihin clone(my 150 quad has one of these babies) Then jetting is the only option. Be warned that it has been known to happen where a bike may come with a bad carb from the start. Porous or leaky casting have been know to pop up here and there. In this case, finding another carb is the only solution. Since it's been relatively easy to find these carbs, replacing an untunable monster is a fairly cheap and easy solution.
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2009 XR650L Big Red Pig Tusk bar risers 2007 X-Moto(Jetmoto) GY250 --mods--- 15/40 sprockets UNI Pod Filter 2007 Shineray TMS 200XYi--Betsy Betsy Mods:______________________ Acerbis DHH headlight FMF Powercore pipe Uni Pod Filter |
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05-29-2007, 10:29 AM | #6 |
Join Date: Oct 2006
Location: Central Ohio
Posts: 289
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My Hensim 150 will not hold and idle when cold - once it's warmed up it runs great though... I messed with it trying to get a good idle all the time, then figured it was just not going to happen -- it takes about 2 mins for me to roll the throttle a bit and fiddle with the choke to get the bike warmed up... then it runs great. Dunno if you might be going down the same path as well - if you are, might do like I did and give up on cold tuning and just focus on a hot bike.
Carb tuning can be frustrating sometimes, that's for sure (and I'm not an expert at it either)... first let's make sure of some basic things: 1. Air Filter -- good and clean (and if oil type make sure it doesn't have too much oil in it) 2. Take carb apart and clean every port (I'm guessing you've already done this) -- verify good flow and also that the float moves properly 3. Air screw is 1 1/2 turns out from fully in. -- we'll start from there (unless you have a setup manual with different stock specs) 4. New spark plug (NGK or anything that's better than the cheap ones most china bikes come with) Once all that's been verified - can you give us more specific details on what the bike's doing... like rough idle, bogging down when you quickly go from 1/4 throttle to wide-full-open, popping from exhaust when letting off the throttle, popping from air box, etc.
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'20 RPS Magician 250 '06 Hensim (Tierra) DB150-2 '06 X-Treme 70cc pitbike '02 Kawasaki KX125 |
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05-29-2007, 10:45 PM | #7 | |
Join Date: May 2007
Location: Illinos USA
Posts: 12
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05-30-2007, 12:02 PM | #8 |
Ahh ok that changes things a bit. I have had this problem with 2 different bikes and 2 different causes. The first was my GY6 quad. At over 1/2 throttle, it would sputter and kick. I found a loose ground at the ignition coil. The second was my bike. Similar issue. This was caused by plastic shavings in the fuel tank blocking the intake screen at the petcock.
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2009 XR650L Big Red Pig Tusk bar risers 2007 X-Moto(Jetmoto) GY250 --mods--- 15/40 sprockets UNI Pod Filter 2007 Shineray TMS 200XYi--Betsy Betsy Mods:______________________ Acerbis DHH headlight FMF Powercore pipe Uni Pod Filter |
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05-30-2007, 08:54 PM | #9 | |
Join Date: May 2007
Location: Illinos USA
Posts: 12
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Liverchip, you're my hero! That's exactly what was wrong with my 150. I looked up under the tank, found the coil, and it was very loose. What happened was the bolts were tight, it's just that the threads in the frame were not tapped deep enough. I stuck a flat washer on the bolt, and tightened it up. Put in the original main jet, and let me tell you, for a $305 dirt bike, that thing rips! Thank you very much. |
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05-31-2007, 01:14 PM | #10 |
Glad to be of help
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2009 XR650L Big Red Pig Tusk bar risers 2007 X-Moto(Jetmoto) GY250 --mods--- 15/40 sprockets UNI Pod Filter 2007 Shineray TMS 200XYi--Betsy Betsy Mods:______________________ Acerbis DHH headlight FMF Powercore pipe Uni Pod Filter |
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