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Post by tocoo on Dec 12, 2018 1:36:45 GMT -5
On my scooter, I need 25% throttle to start, if 100% it does not start.
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Post by tocoo on Dec 10, 2018 1:09:49 GMT -5
on my kisbee with 9bolts it is 723 17.5 28 with roller weight = 30g
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Post by tocoo on Nov 30, 2018 7:08:02 GMT -5
on my scooter, turning the throttle 100% does not make it start on the battery, but at 25%, the start is easy
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Post by tocoo on Nov 26, 2018 7:12:57 GMT -5
Mine felt on the left while I was peeing in a field. THe gas cap was removed as well. SInce it felt on the grass, nothing was broke.
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Post by tocoo on Nov 26, 2018 7:03:12 GMT -5
I have these, two: www.aliexpress.com/item/Keihin-20mm-Big-Bore-Carb-CVK-Keihin-Carburetor-for-Chinese-GY6-50cc-60cc-80cc-100cc-139QMB/32842780358.html They take a while to get to USA. I suspect they are clones, but have no way to tell. I thought them to be of reasonable quality. Using my micrometer, I measure an actual 20mm bore from the butterfly. I did not disassemble, and cannot measure the actual butterfly diameter. but it appears to match the venturi diameter. The vacuum cover has Keihin or engineered in Japan or similar from the injection mold. Keihin is cast into the side where the throttle linkage is attached. There is no serial number(!) which provides the reason for the 'clone' statement. I would say the build quality is definitely better than the OEM carbs, but how much I cannot state. They are a cheap upgrade for someone on limited budget that has more 'wait time' than cash funds. I'd buy again if needed. tom the performance of this carburetor is the same as the pd18j ?
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Post by tocoo on Nov 21, 2018 6:50:10 GMT -5
for my 50cc 139qmb, it was a 39mm nut, but I replaced it with a 38mm which is the norm?
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Post by tocoo on Nov 9, 2018 0:23:11 GMT -5
these are my measurements
thickness of clip = 0,3mm length between 2 grooves = 0,56mm diameter of needle = 2,89mm
so only a washer with 3mm diameter can work and of course those are 0,5mm in thickness which is nearly the length between 2 grooves. It makes it useless to use additional washer.
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Post by tocoo on Nov 8, 2018 11:05:46 GMT -5
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Post by tocoo on Nov 8, 2018 10:28:01 GMT -5
I do not know if it is the weather or my CDI, but since my unrestricted CDi [sold by the official dealer] has died, I had very poor top RPM. THe scooter spends lots of time around 50km/h at 7400 RPM and it struggles to reach 7700 RPM.
SO I ordered a unrestricted CDI, where the advance is not adjustable and the poor top speeds were still here. I had to change the main jet from 83 to 88 [but 85 will be tried too] and the needle has been raised [lowest position for the clip] Before the raise of the needle, the scooter did not hesitate at acceleration, whereas it did with my Dead CDI, which I attributed to the change of length of the spring in the pulley. Once I raised the needle, the hesitation came back. But the top speed are good again.
So you can look at the height of the needle.
Perhaps I can lower the idle jet to reduce the hesitation, but I am already at 2--2,5 turns with the mixture screw and I fear the cold start and idle would worsen. I will try it tomorrow though, just to see.
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Post by tocoo on Nov 7, 2018 10:17:32 GMT -5
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Post by tocoo on Nov 4, 2018 9:19:30 GMT -5
I was told that tires of any vehicle harden years after years and even if they are not worn, they must be changed after 5 years after the date of manufacturing [not the date of purchase]. Is it true for the 50cc scooters like the gy6 139qmb ?
Since it seems hard to change a tyre, I was thinking of letting the mechanics do it, but I would like a price range for his service. how long does it take to change 2 tires on a scooter {I will tell me to change the 2 breaks too, since they get near the age of 5 years] ?
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Post by tocoo on Oct 27, 2018 6:45:19 GMT -5
In any case, as soon as you want to use an unrestricted CDI for the 50cc kisbee, you need to remove the black wire form the 4-pin connector. It is hard to do by hand, so I left this task to the official dealer. On this video the guy uses his custom tool www.youtube.com/watch?v=Md-yCtGx5xgI received by unrestricted CDI today and the cold start on battery is way easier. I could not even start the scooter with the original CDI. I do not understand why I struggle so much, while you claim you have zero problem cold starting on battery. You really should choose your jets with unrestricted CDI and also with the ring at the base of the ceramic of the spark plug after applying WOT and turning the key OFF and braking. ANyway, i set also the mixture screw and I could decrease the mixture by 1 full turn. i am at 2,5 turns now. idle jet = 33, main jet = 82, original coil, original carburetor. spark plug gap at 0,75mm or 0,8mm.
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Post by tocoo on Oct 27, 2018 0:12:34 GMT -5
Yes it is the original. As I said in my thread about the death of my unrestricted CDI, you can de-restrict the original CDI by -disconnecting the extra blue wire -connecting the blue wire from the CDI to the 12V of the battery. People say to cut in half the black wire to the CDI and use one half to connect to the blue socket. I prefer to keep the wires as original as I can, so I just use a wire directly from the 12V of the battery to the blue connector. Can you test this ? So when you say "cut in half" you mean connect a "thief" wire to it, still keeping the original black wire connection to CDI, and connecting thief to blue wire of CDI while completely disconnecting the original blue wire coming from engine to CDI? yes it is what I mean. I refuse to do slice the black wire, and I use a new wire to feed the blue connectoron the CDI. THe blue wire form the CVT is no longer connected.
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Post by tocoo on Oct 26, 2018 3:01:31 GMT -5
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Post by tocoo on Oct 26, 2018 2:40:00 GMT -5
Yes it is the original. As I said in my thread about the death of my unrestricted CDI, you can de-restrict the original CDI by -disconnecting the extra blue wire -connecting the blue wire from the CDI to the 12V of the battery. People say to cut in half the black wire to the CDI and use one half to connect to the blue socket. I prefer to keep the wires as original as I can, so I just use a wire directly from the 12V of the battery to the blue connector.
Can you test this ?
I noted that that my spark plug is wet of fuel with the original restricted CDI, original coil [orange coil has resistance of 2000 homs and the start is even more difficult], idle jet = 33 and main jet = 82. It makes the scooter very hard to cold start on battery.
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